Duringthisperiod,GeneralMotors’scaralsousedafront-mountedairconditioningsystem.The
company’sHarrisonDivisiondesignedthissystem,butunliketheNashintegratedsystem,this
systemwasnotwellintegrated(usedducts)andwasalsoabitexpensive.Duetothis,thenash
systembecamepopularamongpeople,andtheinefficiencyofotherACsystemshelpedthemto
gain an advantage among their rivals.
Theendofthe20thcenturymarkedthebeginningofusingtheACsystemsonawidescale.
PeoplehadmanyconcernsabouttheimpactoftheACsystemontheoverallperformanceof
car.Still,manyinfavourofthesystemssaidthattheairresistancethatthecarfacedwithopen
windowswasmuchlessthanmetwiththeclosedwindows.Manycaseswerelookedupon,and
afewyearslater,Cadillaccarcompanywasthefirstcarcompanytouseanautomaticcooling
systemintheir 1964 carmodel.Sincethenthesesystemshavemadeapermanentpalaceinthe
automobile industry.
Ongoing research,
Airconditionersareoneofthemainreasonswhytheozonelayerisdepleting.Thecoolantused
leadsto emissionofCo2, which,inturn,affectstheozonelayerbybreakingdownozoneto
oxygenandnascentoxygen,beingthemainreasonforglobalwarming.Thus,researchisgoing
ontouseCO 2 itselfasacoolant.Also,manufacturersarefindingoutawaytominimisethe
impact of air conditioners on vehicle fuel consumption.It is an active field of research.