ASCS Exam Questions and Answers Updated 2026

ASCS Exam Questions and
Answers Updated 2026
HavingAaAregularAHVACAfilterAreplacementAplanAcanAhelp:
A.AProtectAtheAsystemAcomponents
B.ADoubleAtheAsystem'sAairflow
C.AHumidifyAtheAairflow
D.ASanitizeAtheAsystemAcomponentsA-
AAnswerAA.AProtectAtheAsystemAcomponents


AccordingAtoAACR,AtheANADCAAStandard,AproperlyAperformedAHVACAsystemAcle
aningAservicesAshould:
A.AEliminateAallAcontamination
B.ARestoreAtheAinternalAinsulationAtoAanA"asAnew"Acondition
C.ARestoreAtheAevaporatorAcoilAtoAitsAoriginalApressureAdrop
D.ARenderAtheAsystemAvisiblyAcleanA-
AAnswerAC.ARestoreAtheAevaporatorAcoilAtoAitsAoriginalApressureAdrop


WhichAofAtheAfollowingAcreatesAtheAgreatestArestrictionAofAairflow?
A.AAAdirtyAfanAmotor
B.AAAdirtyAPlenum
C.AAAdirtyACoil
D.AAAdirtyAreturnAductA-AAnswerAC.AAAdirtyAcoil


AccordingAtoAACR,ATheANADCAAStandard,AproperAcleaningAandAmaintenanceAof
AanAHVACAsystem:
A.AEliminatesAodors
B.AAddsAtoAtheAlifeAexpectancyAofAaAsystem
C.AReducesAnoiceApollutionA
D.AAddsAtoAtheAvalueAofAtheAHVACAsystemA-
AAnswerAB.AAddsAtoAtheAlifeAexpectancyAofAaAsystem

,DuringAaAcommercialAsiteAsurvey,AanAASCSAshouldAdoAwhichAofAtheAfollowingA
toAdetermineAclientAexpectations?
A.AInterviewAtheAclient'sAemployees
B.AAskAtheAclientAaAseriesAofAspecificAquestionsApriorAtoAinspections
C.APerformAtheAinspectionAwithoutAinteractionAwithAtheAclient
D.AConsultAanAIndoorAEnvironmentAProfessionsA(IEP)AtoAdetermineAIAQA-
AAnswerAB.AAskAtheAclientAaAseriesAofAspecificAquestionsApriorAtoAinspections


DirtAstreaksAaroundAsupplyAdiffusersAthatAareANOTAcauseAbyAaAdirtyAventilatio
nAsystemAareAMOSTAlikelyAcauseAby:
A.ASlowAdischargeAvelocitiesA
B.AElevatedArelativeAhumidity
C.ADirtyAroomAairAatAtheAdiffuser
D.AThermalAstratificationAaroundAtheAdiffuserA-
AAnswerAC.ADirtyAroomAairAatAtheAdiffuser


AccordingAtoAACR,ATheANADCAAStandard,AwhichAofAtheAfollowingAisAtheAPRIMA
RYApurposeAofAaAwrittenAworkAplan?
A.AMinimizesApotentialAforAlegalAactionAagainstAtheAcontractor
B.AAllowsAaAclearAunderstandingAofAwhatAworkAwillAbeAperformed
C.AEnsuresAcomplianceAwithAcurrentAOccupationalASafetyAandAHealthAAdministra
tionA(OSHA)Aregulations
D.ADocumentsAtheAcompleteAlistAofAmaterialsAtoAbeAusedAonAtheAjobAsiteA-
AAnswerAB.AAllowsAaAclearAunderstandingAofAwhatAworkAwillAbeAperformed


AApackageAunitAcontainsAwhichAofAtheAfollowingAcomponents?
A.ACompressor,AevaporatorAcoil,Acondenser,AsupplyAfan,AandAfilter
B.AEvaporatorAcoil,AVAVAbox,Acondenser,AsupplyAfan,AexhaustAfan,AandAfilter
C.ACompressor,AevaporatorAcoil,Acondenser,AsupplyAfan,AexhaustAfan,AandAfilter

, D.ACompressor,AevaporatorAcoil,Acondenser,AsupplyAfan,Athermostat,AandAfilterA
-
AAnswerAB.AEvaporatorAcoil,AVAVAbox,Acondenser,AsupplyAfan,AexhaustAfan,Aa
ndAfilter


TheAmostAcommonAtypesAofAfuelAconsumedAinAmodernAresidentialAHVACAsyste
msAare:
A.ANaturalAGas,Apropane,AandAoil
B.AElectric,Apropane,AandAoil
C.ANaturalAgas,Amethane,AandAoil
D.ANaturalAgas,APropane,AandAethanolA-
AAnswerAD.ANaturalAgas,APropane,AandAethanol


InAwhatAsequenceAisAanAHVACAsystemAtypicallyAcleaned?
A.ASupply,AairAhandler
B.AExhaust,AairAhandler,Areturn,Asupply
C.AReturn,Asupply,Aexhaust,AairAhandler
D.AReturn,AairAhandler,AsupplyA-
AAnswerAB.AExhaust,AairAhandler,Areturn,Asupply


WhatAtypeAofAsupplyAfanAtransfersAlargeAvolumesAofAairAwithAaAminimalAwhe
elAdiameter?
A.ABackward-inclinedAfan
B.AForward-curvedAfan
C.AAxialAfan
D.ARadialAFanA-AAnswerAC.AAxialAfan


AccordingAtoAACR,ATheANADCAAStandard,AcoilAcleaningAshouldAbeAperformed:
A.AOnAtheAupstreamAsideAonly
B.AOnAbothAtheAupstreamAandAdownstreamAsides
C.AOnAtheAdownstreamAsideAonly