Yiziphi izibonelo ezivame ukusetshenziswa zokupholisa?

Okokuqala, kumakhondomu ezimoto, esikhathini esedlule, i-R12 (methyl chlorofluoride) yayisetshenziswa kakhulu, okuyi-refrigerant equkethe i-chlorine. Manje sekuhunyushwe kube i-R134A (tetrafluoroethane), enezinhloso ezifana nokungalimazi i-ozone layer, engashisi, engavuthwa, futhi engalimazi. Esikhathini esizayo, i-R1234yf ne-CO2 zizoba ama-refrigerants anobungane bemvelo futhi zizokhethwa. Ngaphezu kwalokho, kumakhondomu asekhaya, asehunyushwe kwi-R22 (equkethe i-chlorine) esikhathini esedlule kuya kwi-R410A yamanje, nayo enezinhloso ezifana nokungalimazi i-ozone layer, engashisi, engavuthwa, futhi engalimazi. I-R32 (difluoromethane) izoba yitrendi.