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  <xsd:element id="aaon_ScheduleOfInventoryAllowanceTableTextBlock" name="ScheduleOfInventoryAllowanceTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_ScheduleOfPropertyPlantAndEquipmentUsefulLivesTableTextBlock" name="ScheduleOfPropertyPlantAndEquipmentUsefulLivesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_ScheduleOfShareBasedCompensationExpenseTableTextBlock" name="ScheduleOfShareBasedCompensationExpenseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_ScheduleOfShareholdersEquityLineItems" name="ScheduleOfShareholdersEquityLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_ScheduleOfShareholdersEquityTable" name="ScheduleOfShareholdersEquityTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_ScheduleofAccountingPoliciesLineItems" name="ScheduleofAccountingPoliciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_ScheduleofAccountingPoliciesTable" name="ScheduleofAccountingPoliciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_ScheduleofShareRepurchasesTableTextBlock" name="ScheduleofShareRepurchasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualVestingPercentage" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualVestingPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionExercisePricePercentageFairMarketValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionExercisePricePercentageFairMarketValue" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_StockCompensationPlanAMember" name="StockCompensationPlanAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_StockOptionsAMember" name="StockOptionsAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_TaxCutsandJobsActof2017ChangeinTaxRateBonusDepreciation" name="TaxCutsandJobsActof2017ChangeinTaxRateBonusDepreciation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="aaon_TaxCutsandJobsActof2017ChangeinTaxRateIncomeTaxExpenseBenefit" name="TaxCutsandJobsActof2017ChangeinTaxRateIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_TriggeringEventAxis" name="TriggeringEventAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="aaon_TriggeringEventDomain" name="TriggeringEventDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="aaon_Valuationreservesnoncurrent" name="Valuationreservesnoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="aaon_Warrantyaccrualnoncurrent" name="Warrantyaccrualnoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
</xsd:schema>
