ASCS Exam Questions and Answers Updated 2026

ASCS Exam
Questions and
Answers Updated
2026
HavingBaBregularBHVACBfilterBreplacementBplanBcanBhelp:

A.BProtectBtheBsystemBcomponents

B.BDoubleBtheBsystem'sBairflow

C.BHumidifyBtheBairflow

D.BSanitizeBtheBsystemBcomponentsB-BAnswerA.BProtectBtheBsystemBcomponents



AccordingBtoBACR,BtheBNADCABStandard,BproperlyBperformedBHVACBsystemBcleaningBse
rvicesBshould:

A.BEliminateBallBcontamination

B.BRestoreBtheBinternalBinsulationBtoBanB"asBnew"Bcondition

C.BRestoreBtheBevaporatorBcoilBtoBitsBoriginalBpressureBdrop

D.BRenderBtheBsystemBvisiblyBcleanB-
BAnswerC.BRestoreBtheBevaporatorBcoilBtoBitsBoriginalBpressureBdrop



WhichBofBtheBfollowingBcreatesBtheBgreatestBrestrictionBofBairflow?

A.BABdirtyBfanBmotor

B.BABdirtyBPlenum

C.BABdirtyBCoil

D.BABdirtyBreturnBductB-BAnswerC.BABdirtyBcoil

,AccordingBtoBACR,BTheBNADCABStandard,BproperBcleaningBandBmaintenanceBofBanBHV
ACBsystem:

A.BEliminatesBodors

B.BAddsBtoBtheBlifeBexpectancyBofBaBsystem

C.BReducesBnoiceBpollutionB

D.BAddsBtoBtheBvalueBofBtheBHVACBsystemB-
BAnswerB.BAddsBtoBtheBlifeBexpectancyBofBaBsystem



DuringBaBcommercialBsiteBsurvey,BanBASCSBshouldBdoBwhichBofBtheBfollowingBtoBdeter
mineBclientBexpectations?

A.BInterviewBtheBclient'sBemployees

B.BAskBtheBclientBaBseriesBofBspecificBquestionsBpriorBtoBinspections

C.BPerformBtheBinspectionBwithoutBinteractionBwithBtheBclient

D.BConsultBanBIndoorBEnvironmentBProfessionsB(IEP)BtoBdetermineBIAQB-
BAnswerB.BAskBtheBclientBaBseriesBofBspecificBquestionsBpriorBtoBinspections



DirtBstreaksBaroundBsupplyBdiffusersBthatBareBNOTBcauseBbyBaBdirtyBventilationBsystem
BareBMOSTBlikelyBcauseBby:

A.BSlowBdischargeBvelocitiesB

B.BElevatedBrelativeBhumidity

C.BDirtyBroomBairBatBtheBdiffuser

D.BThermalBstratificationBaroundBtheBdiffuserB-
BAnswerC.BDirtyBroomBairBatBtheBdiffuser



AccordingBtoBACR,BTheBNADCABStandard,BwhichBofBtheBfollowingBisBtheBPRIMARYBpur
poseBofBaBwrittenBworkBplan?

A.BMinimizesBpotentialBforBlegalBactionBagainstBtheBcontractor

B.BAllowsBaBclearBunderstandingBofBwhatBworkBwillBbeBperformed

C.BEnsuresBcomplianceBwithBcurrentBOccupationalBSafetyBandBHealthBAdministrationB(O
SHA)Bregulations

, D.BDocumentsBtheBcompleteBlistBofBmaterialsBtoBbeBusedBonBtheBjobBsiteB-
BAnswerB.BAllowsBaBclearBunderstandingBofBwhatBworkBwillBbeBperformed



ABpackageBunitBcontainsBwhichBofBtheBfollowingBcomponents?

A.BCompressor,BevaporatorBcoil,Bcondenser,BsupplyBfan,BandBfilter

B.BEvaporatorBcoil,BVAVBbox,Bcondenser,BsupplyBfan,BexhaustBfan,BandBfilter

C.BCompressor,BevaporatorBcoil,Bcondenser,BsupplyBfan,BexhaustBfan,BandBfilter

D.BCompressor,BevaporatorBcoil,Bcondenser,BsupplyBfan,Bthermostat,BandBfilterB-
BAnswerB.BEvaporatorBcoil,BVAVBbox,Bcondenser,BsupplyBfan,BexhaustBfan,BandBfilter



TheBmostBcommonBtypesBofBfuelBconsumedBinBmodernBresidentialBHVACBsystemsBare:

A.BNaturalBGas,Bpropane,BandBoil

B.BElectric,Bpropane,BandBoil

C.BNaturalBgas,Bmethane,BandBoil

D.BNaturalBgas,BPropane,BandBethanolB-BAnswerD.BNaturalBgas,BPropane,BandBethanol



InBwhatBsequenceBisBanBHVACBsystemBtypicallyBcleaned?

A.BSupply,BairBhandler

B.BExhaust,BairBhandler,Breturn,Bsupply

C.BReturn,Bsupply,Bexhaust,BairBhandler

D.BReturn,BairBhandler,BsupplyB-BAnswerB.BExhaust,BairBhandler,Breturn,Bsupply



WhatBtypeBofBsupplyBfanBtransfersBlargeBvolumesBofBairBwithBaBminimalBwheelBdiamet
er?

A.BBackward-inclinedBfan

B.BForward-curvedBfan

C.BAxialBfan

D.BRadialBFanB-BAnswerC.BAxialBfan