<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.emcorgroup.com/20190930" xmlns:eme="http://www.emcorgroup.com/20190930" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:import namespace="http://fasb.org/srt-types/2019-01-31" schemaLocation="http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2019-01-31" schemaLocation="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-types/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2017-01-31" schemaLocation="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/currency/2019-01-31" schemaLocation="https://xbrl.sec.gov/currency/2019/currency-2019-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2019-01-31" schemaLocation="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/exch/2019-01-31" schemaLocation="https://xbrl.sec.gov/exch/2019/exch-2019-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/naics/2017-01-31" schemaLocation="http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2018-01-31" schemaLocation="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd" />
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="eme-20190930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="eme-20190930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="eme-20190930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="eme-20190930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple" />
      <link:roleType id="AcquisitionsOfBusinesses" roleURI="http://www.emcorgroup.com/role/AcquisitionsOfBusinesses">
        <link:definition>2106100 - Disclosure - Acquisitions Of Businesses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsOfBusinessesDetails" roleURI="http://www.emcorgroup.com/role/AcquisitionsOfBusinessesDetails">
        <link:definition>2406401 - Disclosure - Acquisitions Of Businesses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisOfPresentation" roleURI="http://www.emcorgroup.com/role/BasisOfPresentation">
        <link:definition>2101100 - Disclosure - Basis Of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingencies" roleURI="http://www.emcorgroup.com/role/CommitmentsAndContingencies">
        <link:definition>2115100 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesNarrativeDetails" roleURI="http://www.emcorgroup.com/role/CommitmentsAndContingenciesNarrativeDetails">
        <link:definition>2415402 - Disclosure - Commitments and Contingencies Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesRestructuringAndRelatedActivitiesTables" roleURI="http://www.emcorgroup.com/role/CommitmentsAndContingenciesRestructuringAndRelatedActivitiesTables">
        <link:definition>2315301 - Disclosure - Commitments and Contingencies Restructuring and Related Activities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommonStock" roleURI="http://www.emcorgroup.com/role/CommonStock">
        <link:definition>2113100 - Disclosure - Common Stock</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommonStockDetails" roleURI="http://www.emcorgroup.com/role/CommonStockDetails">
        <link:definition>2413401 - Disclosure - Common Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheets" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedBalanceSheets">
        <link:definition>1001000 - Statement - Condensed Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheetsParenthetical" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedBalanceSheetsParenthetical">
        <link:definition>1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfCashFlows" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedStatementsOfCashFlows">
        <link:definition>1004000 - Statement - Condensed Consolidated Statements Of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfCashFlowsCondensedConsolidatedStatementsOfCashFlowsParenthetical" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedStatementsOfCashFlowsCondensedConsolidatedStatementsOfCashFlowsParenthetical">
        <link:definition>1004001 - Statement - Condensed Consolidated Statements Of Cash Flows Condensed Consolidated Statements of Cash Flows (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfComprehensiveIncome" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome">
        <link:definition>1003000 - Statement - Condensed Consolidated Statements Of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical">
        <link:definition>1003501 - Statement - Condensed Consolidated Statements Of Comprehensive Income (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfEquity" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedStatementsOfEquity">
        <link:definition>1005000 - Statement - Condensed Consolidated Statements Of Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfOperations" roleURI="http://www.emcorgroup.com/role/CondensedConsolidatedStatementsOfOperations">
        <link:definition>1002000 - Statement - Condensed Consolidated Statements Of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Debt" roleURI="http://www.emcorgroup.com/role/Debt">
        <link:definition>2110100 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtNarrativeDetails" roleURI="http://www.emcorgroup.com/role/DebtNarrativeDetails">
        <link:definition>2410402 - Disclosure - Debt (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtScheduleOfDebtDetails" roleURI="http://www.emcorgroup.com/role/DebtScheduleOfDebtDetails">
        <link:definition>2410403 - Disclosure - Debt (Schedule Of Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtScheduleOfDebtDetailsCalc2" roleURI="http://www.emcorgroup.com/role/DebtScheduleOfDebtDetailsCalc2">
        <link:definition>2410403 - Disclosure - Debt (Schedule Of Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtTables" roleURI="http://www.emcorgroup.com/role/DebtTables">
        <link:definition>2310301 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DispositionOfAssets" roleURI="http://www.emcorgroup.com/role/DispositionOfAssets">
        <link:definition>2107100 - Disclosure - Disposition of Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DispositionOfAssetsNarrativeDetails" roleURI="http://www.emcorgroup.com/role/DispositionOfAssetsNarrativeDetails">
        <link:definition>2407402 - Disclosure - Disposition of Assets (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DispositionOfAssetsTables" roleURI="http://www.emcorgroup.com/role/DispositionOfAssetsTables">
        <link:definition>2307301 - Disclosure - Disposition of Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DocumentAndEntityInformation" roleURI="http://www.emcorgroup.com/role/DocumentAndEntityInformation">
        <link:definition>0001000 - Document - Document And Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShare" roleURI="http://www.emcorgroup.com/role/EarningsPerShare">
        <link:definition>2108100 - Disclosure - Earnings Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareDetails" roleURI="http://www.emcorgroup.com/role/EarningsPerShareDetails">
        <link:definition>2408402 - Disclosure - Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareTables" roleURI="http://www.emcorgroup.com/role/EarningsPerShareTables">
        <link:definition>2308301 - Disclosure - Earnings Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.emcorgroup.com/role/FairValueMeasurements">
        <link:definition>2111100 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsPolicy" roleURI="http://www.emcorgroup.com/role/FairValueMeasurementsPolicy">
        <link:definition>2211201 - Disclosure - Fair Value Measurements (Policy)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsScheduleOfAssetsAndLiabilitiesCarriedAtFairValueMeasuredOnRecurringBasisDetails" roleURI="http://www.emcorgroup.com/role/FairValueMeasurementsScheduleOfAssetsAndLiabilitiesCarriedAtFairValueMeasuredOnRecurringBasisDetails">
        <link:definition>2411403 - Disclosure - Fair Value Measurements (Schedule Of Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.emcorgroup.com/role/FairValueMeasurementsTables">
        <link:definition>2311302 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.emcorgroup.com/role/IncomeTaxes">
        <link:definition>2112100 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesDetails" roleURI="http://www.emcorgroup.com/role/IncomeTaxesDetails">
        <link:definition>2412401 - Disclosure - Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventories" roleURI="http://www.emcorgroup.com/role/Inventories">
        <link:definition>2109100 - Disclosure - Inventories</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesInventoriesDetails" roleURI="http://www.emcorgroup.com/role/InventoriesInventoriesDetails">
        <link:definition>2409402 - Disclosure - Inventories (Inventories) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesTables" roleURI="http://www.emcorgroup.com/role/InventoriesTables">
        <link:definition>2309301 - Disclosure - Inventories (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.emcorgroup.com/role/Leases">
        <link:definition>2116100 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesPolicy" roleURI="http://www.emcorgroup.com/role/LeasesPolicy">
        <link:definition>2216201 - Disclosure - Leases (Policy)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleOfLeaseAssetsAndLiabilitiesDetails" roleURI="http://www.emcorgroup.com/role/LeasesScheduleOfLeaseAssetsAndLiabilitiesDetails">
        <link:definition>2416403 - Disclosure - Leases (Schedule of Lease Assets and Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleOfLeaseCostsDetails" roleURI="http://www.emcorgroup.com/role/LeasesScheduleOfLeaseCostsDetails">
        <link:definition>2416404 - Disclosure - Leases (Schedule of Lease Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleOfLeaseTermAndDiscountRateDetails" roleURI="http://www.emcorgroup.com/role/LeasesScheduleOfLeaseTermAndDiscountRateDetails">
        <link:definition>2416405 - Disclosure - Leases (Schedule of Lease Term and Discount Rate) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleOfMaturityOfLeaseLiabilitiesDetails" roleURI="http://www.emcorgroup.com/role/LeasesScheduleOfMaturityOfLeaseLiabilitiesDetails">
        <link:definition>2416407 - Disclosure - Leases (Schedule of Maturity of Lease Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleOfSupplementalCashFlowLeaseInformationDetails" roleURI="http://www.emcorgroup.com/role/LeasesScheduleOfSupplementalCashFlowLeaseInformationDetails">
        <link:definition>2416406 - Disclosure - Leases (Schedule of Supplemental Cash Flow Lease Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.emcorgroup.com/role/LeasesTables">
        <link:definition>2316302 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NewAccountingPronouncements" roleURI="http://www.emcorgroup.com/role/NewAccountingPronouncements">
        <link:definition>2102100 - Disclosure - New Accounting Pronouncements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NewAccountingPronouncementsNewAccountingPronouncementsDetails" roleURI="http://www.emcorgroup.com/role/NewAccountingPronouncementsNewAccountingPronouncementsDetails">
        <link:definition>2402401 - Disclosure - New Accounting Pronouncements New Accounting Pronouncements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementPlans" roleURI="http://www.emcorgroup.com/role/RetirementPlans">
        <link:definition>2114100 - Disclosure - Retirement Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementPlansComponentsOfNetPeriodicPensionBenefitCostDetails" roleURI="http://www.emcorgroup.com/role/RetirementPlansComponentsOfNetPeriodicPensionBenefitCostDetails">
        <link:definition>2414403 - Disclosure - Retirement Plans (Components Of Net Periodic Pension Benefit Cost) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementPlansNarrativeDetails" roleURI="http://www.emcorgroup.com/role/RetirementPlansNarrativeDetails">
        <link:definition>2414402 - Disclosure - Retirement Plans (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementPlansTables" roleURI="http://www.emcorgroup.com/role/RetirementPlansTables">
        <link:definition>2314301 - Disclosure - Retirement Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomers" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomers">
        <link:definition>2105100 - Disclosure - Revenue from Contracts with Customers</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersDetails" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomersDetails">
        <link:definition>2405403 - Disclosure - Revenue from Contracts with Customers (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersPolicy" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomersPolicy">
        <link:definition>2205201 - Disclosure - Revenue from Contracts with Customers (Policy)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersScheduleOfContractWithCustomerAssetAndLiabilityDetails" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomersScheduleOfContractWithCustomerAssetAndLiabilityDetails">
        <link:definition>2405405 - Disclosure - Revenue from Contracts with Customers - Schedule of Contract with Customer, Asset and Liability (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersScheduleOfDisaggregationOfRevenuesDetails" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomersScheduleOfDisaggregationOfRevenuesDetails">
        <link:definition>2405404 - Disclosure - Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersScheduleOfRevenueRemainingPerformanceObligationDetails" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomersScheduleOfRevenueRemainingPerformanceObligationDetails">
        <link:definition>2405406 - Disclosure - Revenue from Contracts with Customers - Schedule of Revenue, Remaining Performance Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersScheduleOfRevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionDetails" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomersScheduleOfRevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionDetails">
        <link:definition>2405407 - Disclosure - Revenue from Contracts with Customers - Schedule of Revenue. Remaining Performance Obligation, Expected Timing of Satisfaction (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueFromContractsWithCustomersTables" roleURI="http://www.emcorgroup.com/role/RevenueFromContractsWithCustomersTables">
        <link:definition>2305302 - Disclosure - Revenue from Contracts with Customers (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleOfRestructuringActivitiesDetails" roleURI="http://www.emcorgroup.com/role/ScheduleOfRestructuringActivitiesDetails">
        <link:definition>2415403 - Disclosure - Schedule of Restructuring Activities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformation" roleURI="http://www.emcorgroup.com/role/SegmentInformation">
        <link:definition>2117100 - Disclosure - Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationInformationAboutIndustrySegmentsAndGeographicAreasDetails" roleURI="http://www.emcorgroup.com/role/SegmentInformationInformationAboutIndustrySegmentsAndGeographicAreasDetails">
        <link:definition>2417402 - Disclosure - Segment Information (Information About Industry Segments And Geographic Areas) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationTables" roleURI="http://www.emcorgroup.com/role/SegmentInformationTables">
        <link:definition>2317301 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEventSubsequentEvent" roleURI="http://www.emcorgroup.com/role/SubsequentEventSubsequentEvent">
        <link:definition>2118100 - Disclosure - Subsequent Event Subsequent Event</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element abstract="true" id="eme_A2018AcquisitionsMember" name="A2018AcquisitionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_A2019AcquisitionsMember" name="A2019AcquisitionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_AssetsLeasesAbstract" name="AssetsLeasesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_BusinessCombinationRecognizedOtherNetAssets" name="BusinessCombinationRecognizedOtherNetAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="eme_BusinessCombinationRecognizedWorkingCapital" name="BusinessCombinationRecognizedWorkingCapital" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="eme_CashPaidForAbstract" name="CashPaidForAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CommercialMarketSectorMember" name="CommercialMarketSectorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CommercialSiteBasedServicesMember" name="CommercialSiteBasedServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_ContractWithCustomerCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress" name="ContractWithCustomerCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="eme_ContractwithCustomerAssetsandLiabilitiesNet" name="ContractwithCustomerAssetsandLiabilitiesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="eme_ContractwithCustomerAssetsandLiabilitiesNetChange" name="ContractwithCustomerAssetsandLiabilitiesNetChange" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CreditAgreement0BaseRateMember" name="CreditAgreement0BaseRateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CreditAgreement2016MemberMember" name="CreditAgreement2016MemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CreditAgreementBaseRateBankofMontrealPrimeRateMember" name="CreditAgreementBaseRateBankofMontrealPrimeRateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CreditAgreementBaseRateDailyOneMonthLIBORRateMember" name="CreditAgreementBaseRateDailyOneMonthLIBORRateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_CreditAgreementBaseRateFederalFundsRateMember" name="CreditAgreementBaseRateFederalFundsRateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_CreditAgreementExpirationDate1" name="CreditAgreementExpirationDate1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:dateItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_CreditAgreementInitiationDate1" name="CreditAgreementInitiationDate1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:dateItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_CurrentMaturitiesOfLongTermDebtAndCapitalLeaseObligations" name="CurrentMaturitiesOfLongTermDebtAndCapitalLeaseObligations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="eme_CurrentMaturitiesOfLongTermDebtAndFinanceLeaseLiabilities" name="CurrentMaturitiesOfLongTermDebtAndFinanceLeaseLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="eme_DefinedBenefitPlanNetPeriodicBenefitCostExcludingServiceCost" name="DefinedBenefitPlanNetPeriodicBenefitCostExcludingServiceCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="eme_DefinedBenefitPlanNumberOfPlans" name="DefinedBenefitPlanNumberOfPlans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="eme_DenominatorEarningsPerShareAbstract" name="DenominatorEarningsPerShareAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_DividendsCommonStock1" name="DividendsCommonStock1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="eme_EffectiveIncomeTaxRateBeforeDiscreteItems" name="EffectiveIncomeTaxRateBeforeDiscreteItems" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_EnergyServicesMember" name="EnergyServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_FieldServicesMember" name="FieldServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_FinanceOperatingLeaseLiabilityMaturityTableTextBlockTableTextBlock" name="FinanceOperatingLeaseLiabilityMaturityTableTextBlockTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_GovernmentSiteBasedServicesMember" name="GovernmentSiteBasedServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_HealthcareMarketSectorMember" name="HealthcareMarketSectorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_HospitalityMarketSectorMember" name="HospitalityMarketSectorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_IncreaseBorrowingCapacity" name="IncreaseBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="eme_InstitutionalMarketSectorMember" name="InstitutionalMarketSectorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_LeaseAssetsAndLiabilitiesTableTextBlock" name="LeaseAssetsAndLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_LeaseTermAndDiscountRateTableTextBlock" name="LeaseTermAndDiscountRateTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_LettersOfCreditMaximumBorrowingCapacity" name="LettersOfCreditMaximumBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="eme_LiabilitiesLeasesAbstract" name="LiabilitiesLeasesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_LongTermDebtAndFinanceLeaseLiabilitiesNonCurrent" name="LongTermDebtAndFinanceLeaseLiabilitiesNonCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="eme_ManufacturingMarketSectorMember" name="ManufacturingMarketSectorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_MechanicalServicesMember" name="MechanicalServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_NonCashIncomeFromContingentConsiderationArrangement" name="NonCashIncomeFromContingentConsiderationArrangement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="eme_Noncashsharebasedcompensationexpense" name="Noncashsharebasedcompensationexpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_NumeratorEarningsPerShareAbstract" name="NumeratorEarningsPerShareAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_OperatingAndFinanceLeaseAssetsTotal" name="OperatingAndFinanceLeaseAssetsTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="eme_OperatingAndFinanceLeaseLiabilitiesTotal" name="OperatingAndFinanceLeaseLiabilitiesTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="eme_PaymentsforContingentConsiderationArrangements" name="PaymentsforContingentConsiderationArrangements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="eme_PercentageOfIndividualSegmentRevenues" name="PercentageOfIndividualSegmentRevenues" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_ProjectsExtrasMember" name="ProjectsExtrasMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_RangeOfLetterOfCreditFees" name="RangeOfLetterOfCreditFees" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="eme_RepurchaseProgramSep2011toSep2019Member" name="RepurchaseProgramSep2011toSep2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_RepurchaseProgramSep262011Member" name="RepurchaseProgramSep262011Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_RevenueRemainingPerformanceObligationTableTextBlock" name="RevenueRemainingPerformanceObligationTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_RevolvingCreditFacility2016MemberMember" name="RevolvingCreditFacility2016MemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_ScheduleofRemainingPerformanceObligationsLineItems" name="ScheduleofRemainingPerformanceObligationsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_ScheduleofRemainingPerformanceObligationsTable" name="ScheduleofRemainingPerformanceObligationsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_ServiceWorkMember" name="ServiceWorkMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_ShopServicesMember" name="ShopServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_ShortDurationProjectsMember" name="ShortDurationProjectsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="eme_SupplementalCashFlowLeaseInformationTableTextBlock" name="SupplementalCashFlowLeaseInformationTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_TermLoan2016MemberMember" name="TermLoan2016MemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_TransportationMarketSectorMember" name="TransportationMarketSectorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_UnitedKingdomBuildingServicesMemberMember" name="UnitedKingdomBuildingServicesMemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_UnitedKingdomConstructionMember" name="UnitedKingdomConstructionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_UnitedKingdomSubsidiaryMember" name="UnitedKingdomSubsidiaryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_UnitedStatesBuildingServicesMember" name="UnitedStatesBuildingServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_UnitedStatesElectricalConstructionAndFacilitiesServicesMember" name="UnitedStatesElectricalConstructionAndFacilitiesServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_UnitedStatesIndustrialServicesMember" name="UnitedStatesIndustrialServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_UnitedStatesMechanicalConstructionAndFacilitiesServicesMember" name="UnitedStatesMechanicalConstructionAndFacilitiesServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_WaterandWastewaterMarketSectorMember" name="WaterandWastewaterMarketSectorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_WeighedAverageDiscountRateAbstract" name="WeighedAverageDiscountRateAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="eme_WeightedAverageRemainingLeaseTermAbstract" name="WeightedAverageRemainingLeaseTermAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
</xsd:schema>
