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| Table 1: Substitutes for working fluids in heat pumps | ||
| Old working fluid | Replacement pure working fluid | Replacement mixture working fluid |
| R12 (cfc) | R134a R152a Isobutane (R600a) Cyclopropane (RC270) Ammonia (R717) | Propane/isobutane (R290/R600a) |
| R502 (hcfc-cfc blend) | Propane (R290) Ammonia (R717) | R404a R407a R407b R507 |
| R22 (hcfc) | Propane (R290) CO2 (R744) Ammonia (R717) | R407c R410a R-507 |
| R114 (cfc) | R123 R124 | Butane/propane (R600/R290) |