<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:7f2cafcd-1c37-41c9-89fa-09b05589840b,g:8a2ed2bd-0fcd-4d18-a712-abfe8ef5c366-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:lii="http://www.lennoxinternational.com/20250630" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types1="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.lennoxinternational.com/20250630">
  <xs:import namespace="http://fasb.org/srt/2024" schemaLocation="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2024" schemaLocation="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2024" schemaLocation="https://xbrl.sec.gov/country/2024/country-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2024" schemaLocation="https://xbrl.sec.gov/dei/2024/dei-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2024" schemaLocation="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lii-20250630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lii-20250630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lii-20250630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lii-20250630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.lennoxinternational.com/role/Cover">
        <link:definition>0000001 - Document - Cover</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="ConsolidatedBalanceSheets" roleURI="http://www.lennoxinternational.com/role/ConsolidatedBalanceSheets">
        <link:definition>9952151 - Statement - 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="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.lennoxinternational.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>9952152 - Statement - 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="ConsolidatedStatementsofOperations" roleURI="http://www.lennoxinternational.com/role/ConsolidatedStatementsofOperations">
        <link:definition>9952153 - Statement - 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="ConsolidatedStatementsofComprehensiveIncome" roleURI="http://www.lennoxinternational.com/role/ConsolidatedStatementsofComprehensiveIncome">
        <link:definition>9952154 - Statement - 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="ConsolidatedStatementsofStockholdersDeficit" roleURI="http://www.lennoxinternational.com/role/ConsolidatedStatementsofStockholdersDeficit">
        <link:definition>9952155 - Statement - Consolidated Statements of Stockholders' Deficit</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="ConsolidatedStatementsofStockholdersDeficitParenthetical" roleURI="http://www.lennoxinternational.com/role/ConsolidatedStatementsofStockholdersDeficitParenthetical">
        <link:definition>9952156 - Statement - Consolidated Statements of Stockholders' Deficit (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="ConsolidatedStatementsofCashFlows" roleURI="http://www.lennoxinternational.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>9952157 - Statement - 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="General" roleURI="http://www.lennoxinternational.com/role/General">
        <link:definition>9952158 - Disclosure - General</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="ReportableBusinessSegments" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegments">
        <link:definition>9952159 - Disclosure - Reportable Business Segments</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.lennoxinternational.com/role/EarningsPerShare">
        <link:definition>9952160 - 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="CommitmentsandContingencies" roleURI="http://www.lennoxinternational.com/role/CommitmentsandContingencies">
        <link:definition>9952161 - 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="StockRepurchases" roleURI="http://www.lennoxinternational.com/role/StockRepurchases">
        <link:definition>9952162 - Disclosure - Stock Repurchases</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="RevenueRecognition" roleURI="http://www.lennoxinternational.com/role/RevenueRecognition">
        <link:definition>9952163 - Disclosure - Revenue Recognition</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.lennoxinternational.com/role/Inventories">
        <link:definition>9952164 - 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="Goodwill" roleURI="http://www.lennoxinternational.com/role/Goodwill">
        <link:definition>9952165 - Disclosure - Goodwill</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="Derivatives" roleURI="http://www.lennoxinternational.com/role/Derivatives">
        <link:definition>9952166 - Disclosure - Derivatives</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="StockBasedCompensation" roleURI="http://www.lennoxinternational.com/role/StockBasedCompensation">
        <link:definition>9952167 - Disclosure - Stock-Based Compensation</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="PensionBenefitPlans" roleURI="http://www.lennoxinternational.com/role/PensionBenefitPlans">
        <link:definition>9952168 - Disclosure - Pension Benefit 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="IncomeTaxes" roleURI="http://www.lennoxinternational.com/role/IncomeTaxes">
        <link:definition>9952169 - 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="LinesofCreditandFinancingArrangements" roleURI="http://www.lennoxinternational.com/role/LinesofCreditandFinancingArrangements">
        <link:definition>9952170 - Disclosure - Lines of Credit and Financing Arrangements</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="ComprehensiveIncomeLoss" roleURI="http://www.lennoxinternational.com/role/ComprehensiveIncomeLoss">
        <link:definition>9952171 - Disclosure - Comprehensive Income (Loss)</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.lennoxinternational.com/role/FairValueMeasurements">
        <link:definition>9952172 - 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="GeneralPolicies" roleURI="http://www.lennoxinternational.com/role/GeneralPolicies">
        <link:definition>9955511 - Disclosure - General (Policies)</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="CommitmentandContingenciesPolicies" roleURI="http://www.lennoxinternational.com/role/CommitmentandContingenciesPolicies">
        <link:definition>9955512 - Disclosure - Commitment and Contingencies (Policies)</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="ReportableBusinessSegmentsTables" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsTables">
        <link:definition>9955513 - Disclosure - Reportable Business Segments (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="EarningsPerShareTables" roleURI="http://www.lennoxinternational.com/role/EarningsPerShareTables">
        <link:definition>9955514 - 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="CommitmentsandContingenciesTables" roleURI="http://www.lennoxinternational.com/role/CommitmentsandContingenciesTables">
        <link:definition>9955515 - Disclosure - Commitments and Contingencies (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="RevenueRecognitionTables" roleURI="http://www.lennoxinternational.com/role/RevenueRecognitionTables">
        <link:definition>9955516 - Disclosure - Revenue Recognition (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="InventoriesTables" roleURI="http://www.lennoxinternational.com/role/InventoriesTables">
        <link:definition>9955517 - 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="GoodwillTables" roleURI="http://www.lennoxinternational.com/role/GoodwillTables">
        <link:definition>9955518 - Disclosure - Goodwill (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="DerivativesTables" roleURI="http://www.lennoxinternational.com/role/DerivativesTables">
        <link:definition>9955519 - Disclosure - Derivatives (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="StockBasedCompensationTables" roleURI="http://www.lennoxinternational.com/role/StockBasedCompensationTables">
        <link:definition>9955520 - Disclosure - Stock-Based Compensation (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="PensionBenefitPlansTables" roleURI="http://www.lennoxinternational.com/role/PensionBenefitPlansTables">
        <link:definition>9955521 - Disclosure - Pension Benefit 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="LinesofCreditandFinancingArrangementsTables" roleURI="http://www.lennoxinternational.com/role/LinesofCreditandFinancingArrangementsTables">
        <link:definition>9955522 - Disclosure - Lines of Credit and Financing Arrangements (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="ComprehensiveIncomeLossTables" roleURI="http://www.lennoxinternational.com/role/ComprehensiveIncomeLossTables">
        <link:definition>9955523 - Disclosure - Comprehensive Income (Loss) (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="FairValueMeasurementsTables" roleURI="http://www.lennoxinternational.com/role/FairValueMeasurementsTables">
        <link:definition>9955524 - 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="ReportableBusinessSegmentsDescriptionofSegmentsDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsDescriptionofSegmentsDetails">
        <link:definition>9955525 - Disclosure - Reportable Business Segments (Description of Segments) (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="ReportableBusinessSegmentsKeyFinancialInformationbySegmentDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsKeyFinancialInformationbySegmentDetails">
        <link:definition>9955526 - Disclosure - Reportable Business Segments (Key Financial Information by Segment) (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="ReportableBusinessSegmentsNetSalesandSegmentProfitLossandReconciliationtoIncomefromContinuingOperationsDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsNetSalesandSegmentProfitLossandReconciliationtoIncomefromContinuingOperationsDetails">
        <link:definition>9955527 - Disclosure - Reportable Business Segments (Net Sales and Segment Profit (Loss) and Reconciliation to Income from Continuing Operations) (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="ReportableBusinessSegmentsAssetsbySegmentDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsAssetsbySegmentDetails">
        <link:definition>9955528 - Disclosure - Reportable Business Segments (Assets by Segment) (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="ReportableBusinessSegmentsCapitalExpendituresbySegmentDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsCapitalExpendituresbySegmentDetails">
        <link:definition>9955529 - Disclosure - Reportable Business Segments (Capital Expenditures by Segment) (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="ReportableBusinessSegmentsDepreciationandAmortizationExpensebySegmentDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsDepreciationandAmortizationExpensebySegmentDetails">
        <link:definition>9955530 - Disclosure - Reportable Business Segments (Depreciation and Amortization Expense by Segment) (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="ReportableBusinessSegmentsEquityMethodInvestmentsDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsEquityMethodInvestmentsDetails">
        <link:definition>9955531 - Disclosure - Reportable Business Segments (Equity Method Investments) (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="ReportableBusinessSegmentsGeographicInformationDetails" roleURI="http://www.lennoxinternational.com/role/ReportableBusinessSegmentsGeographicInformationDetails">
        <link:definition>9955532 - Disclosure - Reportable Business Segments (Geographic 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="EarningsPerShareComputationofBasicandDilutedEarningsPerShareDetails" roleURI="http://www.lennoxinternational.com/role/EarningsPerShareComputationofBasicandDilutedEarningsPerShareDetails">
        <link:definition>9955533 - Disclosure - Earnings Per Share (Computation of Basic and Diluted 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="EarningsPerShareExcludedfromDilutedEarningsPerShareCalculationDetails" roleURI="http://www.lennoxinternational.com/role/EarningsPerShareExcludedfromDilutedEarningsPerShareCalculationDetails">
        <link:definition>9955534 - Disclosure - Earnings Per Share (Excluded from Diluted Earnings Per Share Calculation) (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="CommitmentsandContingenciesLiabilitiesforEstimatedProductWarrantyCostsDetails" roleURI="http://www.lennoxinternational.com/role/CommitmentsandContingenciesLiabilitiesforEstimatedProductWarrantyCostsDetails">
        <link:definition>9955535 - Disclosure - Commitments and Contingencies (Liabilities for Estimated Product Warranty 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="CommitmentsandContingenciesChangesinProductWarrantyLiabilitiesDetails" roleURI="http://www.lennoxinternational.com/role/CommitmentsandContingenciesChangesinProductWarrantyLiabilitiesDetails">
        <link:definition>9955536 - Disclosure - Commitments and Contingencies (Changes in Product Warranty 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="CommitmentsandContingenciesNarrativeDetails" roleURI="http://www.lennoxinternational.com/role/CommitmentsandContingenciesNarrativeDetails">
        <link:definition>9955537 - 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="StockRepurchasesDetails" roleURI="http://www.lennoxinternational.com/role/StockRepurchasesDetails">
        <link:definition>9955538 - Disclosure - Stock Repurchases (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="RevenueRecognitionNarrativeDetails" roleURI="http://www.lennoxinternational.com/role/RevenueRecognitionNarrativeDetails">
        <link:definition>9955539 - Disclosure - Revenue Recognition (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="RevenueRecognitionRevenuebyBusinessSegmentbyGeographyDetails" roleURI="http://www.lennoxinternational.com/role/RevenueRecognitionRevenuebyBusinessSegmentbyGeographyDetails">
        <link:definition>9955540 - Disclosure - Revenue Recognition (Revenue by Business Segment by Geography) (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="RevenueRecognitionNetContractAssetsLiabilitiesDetails" roleURI="http://www.lennoxinternational.com/role/RevenueRecognitionNetContractAssetsLiabilitiesDetails">
        <link:definition>9955541 - Disclosure - Revenue Recognition (Net Contract Assets (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="InventoriesDetails" roleURI="http://www.lennoxinternational.com/role/InventoriesDetails">
        <link:definition>9955542 - Disclosure - 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="GoodwillDetails" roleURI="http://www.lennoxinternational.com/role/GoodwillDetails">
        <link:definition>9955543 - Disclosure - Goodwill (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="DerivativesAOCLRelatedtoCashFlowHedgesDetails" roleURI="http://www.lennoxinternational.com/role/DerivativesAOCLRelatedtoCashFlowHedgesDetails">
        <link:definition>9955544 - Disclosure - Derivatives (AOCL Related to Cash Flow Hedges) (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="StockBasedCompensationDetails" roleURI="http://www.lennoxinternational.com/role/StockBasedCompensationDetails">
        <link:definition>9955545 - Disclosure - Stock-Based Compensation (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="PensionBenefitPlansDetails" roleURI="http://www.lennoxinternational.com/role/PensionBenefitPlansDetails">
        <link:definition>9955546 - Disclosure - Pension Benefit Plans (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="IncomeTaxesDetails" roleURI="http://www.lennoxinternational.com/role/IncomeTaxesDetails">
        <link:definition>9955547 - 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="LinesofCreditandFinancingArrangementsOutstandingDebtObligationsDetails" roleURI="http://www.lennoxinternational.com/role/LinesofCreditandFinancingArrangementsOutstandingDebtObligationsDetails">
        <link:definition>9955548 - Disclosure - Lines of Credit and Financing Arrangements (Outstanding Debt Obligations) (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="LinesofCreditandFinancingArrangementsCommercialPaperProgramDetails" roleURI="http://www.lennoxinternational.com/role/LinesofCreditandFinancingArrangementsCommercialPaperProgramDetails">
        <link:definition>9955549 - Disclosure - Lines of Credit and Financing Arrangements (Commercial Paper Program) (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="LinesofCreditandFinancingArrangementsDomesticCreditFacilityDetails" roleURI="http://www.lennoxinternational.com/role/LinesofCreditandFinancingArrangementsDomesticCreditFacilityDetails">
        <link:definition>9955550 - Disclosure - Lines of Credit and Financing Arrangements (Domestic Credit Facility) (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="LinesofCreditandFinancingArrangementsWeightedAverageBorrowingRateDetails" roleURI="http://www.lennoxinternational.com/role/LinesofCreditandFinancingArrangementsWeightedAverageBorrowingRateDetails">
        <link:definition>9955551 - Disclosure - Lines of Credit and Financing Arrangements (Weighted Average Borrowing 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="LinesofCreditandFinancingArrangementsSeniorUnsecuredNotesDetails" roleURI="http://www.lennoxinternational.com/role/LinesofCreditandFinancingArrangementsSeniorUnsecuredNotesDetails">
        <link:definition>9955552 - Disclosure - Lines of Credit and Financing Arrangements (Senior Unsecured Notes) (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="ComprehensiveIncomeLossReclassificationoutofAOCLDetails" roleURI="http://www.lennoxinternational.com/role/ComprehensiveIncomeLossReclassificationoutofAOCLDetails">
        <link:definition>9955553 - Disclosure - Comprehensive Income (Loss) (Reclassification out of AOCL) (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="ComprehensiveIncomeLossChangesinAOCLDetails" roleURI="http://www.lennoxinternational.com/role/ComprehensiveIncomeLossChangesinAOCLDetails">
        <link:definition>9955554 - Disclosure - Comprehensive Income (Loss) (Changes in AOCL) (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="FairValueMeasurementsOtherFairValueDisclosuresDetails" roleURI="http://www.lennoxinternational.com/role/FairValueMeasurementsOtherFairValueDisclosuresDetails">
        <link:definition>9955555 - Disclosure - Fair Value Measurements (Other Fair Value Disclosures) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="lii_GainLossOnPreviousAcquisition" abstract="false" name="GainLossOnPreviousAcquisition" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_Noncashpensionsettlementloss" abstract="false" name="Noncashpensionsettlementloss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossPensionSettlementsBeforeReclassificationAndTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossPensionSettlementsBeforeReclassificationAndTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_PaymentsToAcquireBusinessesNetOfCashAcquiredExcludingPreviousAcquisitions" abstract="false" name="PaymentsToAcquireBusinessesNetOfCashAcquiredExcludingPreviousAcquisitions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_ScheduleOfInsuranceRecoveriesTableTextBlock" abstract="false" name="ScheduleOfInsuranceRecoveriesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="lii_WeightedAverageBorrowingRateFacilityTableTextBlock" abstract="false" name="WeightedAverageBorrowingRateFacilityTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="lii_ResidentialHeatingAndCoolingMember" abstract="true" name="ResidentialHeatingAndCoolingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_CommercialHeatingAndCoolingMember" abstract="true" name="CommercialHeatingAndCoolingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_OtherNonoperatingIncomeExpenseAdjusted" abstract="false" name="OtherNonoperatingIncomeExpenseAdjusted" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_SegmentProfitAndLoss" abstract="false" name="SegmentProfitAndLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_RevenueFromTransactionsWithMajorCustomers" abstract="false" name="RevenueFromTransactionsWithMajorCustomers" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_InternationalMember" abstract="false" name="InternationalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_OperatingLeaseRightOfUseAssetPercentageRelatedToLeasesOfRealEstate" abstract="false" name="OperatingLeaseRightOfUseAssetPercentageRelatedToLeasesOfRealEstate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="lii_EquipmentSalesMember" abstract="true" name="EquipmentSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_ContractwithCustomerAssetLiabilityNet" abstract="false" name="ContractwithCustomerAssetLiabilityNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesProvisionBenefitForTax" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesProvisionBenefitForTax" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_CommercialPaperMaximumBorrowingCapacity" abstract="false" name="CommercialPaperMaximumBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_A2025NotesMember" abstract="true" name="A2025NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_A2027NotesMember" abstract="true" name="A2027NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_SubfacilityforSwinglineLoansMember" abstract="true" name="SubfacilityforSwinglineLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_RevolvingCreditFacilityCommittedToStandByLettersOfCredit" abstract="false" name="RevolvingCreditFacilityCommittedToStandByLettersOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_DebtInstrumentNumberOfExtensionOptions" abstract="false" name="DebtInstrumentNumberOfExtensionOptions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="lii_DebtInstrumentCovenantNetLeverageRatio" abstract="false" name="DebtInstrumentCovenantNetLeverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="lii_DebtInstrumentCovenantNetLeverageRatioFollowingMaterialAcquisition" abstract="false" name="DebtInstrumentCovenantNetLeverageRatioFollowingMaterialAcquisition" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="lii_MinimumAmountOfPrincipalOrInterestDueOnIndebtednessOrReceivableSecuritization" abstract="false" name="MinimumAmountOfPrincipalOrInterestDueOnIndebtednessOrReceivableSecuritization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_DebtInstrumentSeriesOfDebtNotes" abstract="false" name="DebtInstrumentSeriesOfDebtNotes" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="lii_LineOfCreditFacilityAccordionFeatureIncreaseLimit" abstract="false" name="LineOfCreditFacilityAccordionFeatureIncreaseLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lii_DebtInstrumentExtensionTerm" abstract="false" name="DebtInstrumentExtensionTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lii_A2023NotesMember" abstract="true" name="A2023NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="lii_A2028NotesMember" abstract="true" name="A2028NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lii_PeriodForRescissionOfAcceleratedDebt" abstract="false" name="PeriodForRescissionOfAcceleratedDebt" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lii_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxRollForward" abstract="true" name="ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
</xs:schema>
