Fa'avae i luga o vaila'au fa'aa'oa'o, e mafai ona vaevaeina fa'aaisa fa'aaisa fale gaosimea i ni vaega se 5: fa'aaisa fa'ameamea fa'afefiloi, freon, fa'alili hydrocarbon tumu, fa'alili hydrocarbon unsaturated, ma fa'afefiloi azeotropic refrigerants. E tusa ai ma le mamafa o le condensing, e mafai ona faʻavasegaina pusaaisa chiller i vaega e 3: pusaaisa maualuga-maualalo (maualalo-omiga), pusaaisa-vevela (medium-pressure) refrigerants, ma pusaaisa maualalo-maualalo (maualalo-omiga). O pusaaisa e masani ona fa'aaogaina i fale fa'a'alili o le ammonia, freon, ma hydrocarbons.