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  <xs:element id="iesc_ControllingShareholderTextBlock" abstract="false" name="ControllingShareholderTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="iesc_RedeemableNoncontrollingInterestAxis" abstract="true" name="RedeemableNoncontrollingInterestAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="iesc_RedeemableNoncontrollingInterestDomain" abstract="true" name="RedeemableNoncontrollingInterestDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_BayonetMember" abstract="true" name="BayonetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_EdmonsonElectricMember" abstract="true" name="EdmonsonElectricMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_NEXTElectricMember" abstract="true" name="NEXTElectricMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_RepurchaseOfRedeemableNoncontrollingInterestIncludingAccruedLiabilities" abstract="false" name="RepurchaseOfRedeemableNoncontrollingInterestIncludingAccruedLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_IncorporatedInvesteeMember" abstract="true" name="IncorporatedInvesteeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_ControllingShareholderOwnershipPercentage" abstract="false" name="ControllingShareholderOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="iesc_PerformanceObligationNext12Months" abstract="false" name="PerformanceObligationNext12Months" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_IndustrialServicesMember" abstract="true" name="IndustrialServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_CustomEngineeredSolutionsMember" abstract="true" name="CustomEngineeredSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_SingleFamilyElectricalContractsMember" abstract="true" name="SingleFamilyElectricalContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_MultiFamilyandOtherMember" abstract="true" name="MultiFamilyandOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_SingleFamilyContractsPlumbingHVACMember" abstract="true" name="SingleFamilyContractsPlumbingHVACMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_CommercialandIndustrialMember" abstract="true" name="CommercialandIndustrialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_CommunicationsMember" abstract="true" name="CommunicationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_InfrastructureSolutionsMember" abstract="true" name="InfrastructureSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_ResidentialMember" abstract="true" name="ResidentialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_ConsolidatedTotalLeverageRatioMaximum" abstract="false" name="ConsolidatedTotalLeverageRatioMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iesc_ConsolidatedInterestCoverageRatioMinimum" abstract="false" name="ConsolidatedInterestCoverageRatioMinimum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iesc_ConsolidatedTotalLeverageRatioRestrictiveCovenant" abstract="false" name="ConsolidatedTotalLeverageRatioRestrictiveCovenant" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iesc_EquityIncentivePlanMember" abstract="true" name="EquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_AmendedEquityIncentivePlanMember" abstract="true" name="AmendedEquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_PhantomShareUnitsEmployeePSUsMember" abstract="true" name="PhantomShareUnitsEmployeePSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_JettMember" abstract="true" name="JettMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_ArrowEngineCompanyMember" abstract="true" name="ArrowEngineCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_InsuranceRelatedMember" abstract="true" name="InsuranceRelatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_Estimatedcostofcompletionofbondedproject" abstract="false" name="Estimatedcostofcompletionofbondedproject" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_PricingLevelAxis" abstract="true" name="PricingLevelAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="iesc_PricingLevelDomain" abstract="true" name="PricingLevelDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_PricingLevelIIIMember" abstract="true" name="PricingLevelIIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_PricingLevelIIMember" abstract="true" name="PricingLevelIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_PricingLevelIVMember" abstract="true" name="PricingLevelIVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_PricingLevelIMember" abstract="true" name="PricingLevelIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_ConsolidatedTotalLeverageRatio" abstract="false" name="ConsolidatedTotalLeverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="iesc_CreditAgreementInterestMarginRate" abstract="false" name="CreditAgreementInterestMarginRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
</xs:schema>
