The U.S. Environmental Protection Agency (EPA) warns homeowners, propane manufacturers and sellers, home improvement contractors and air-conditioning technicians of potential safety hazards related to the use of propane or other unapproved refrigerants in home air-conditioning systems.
The EPA is currently investigating instances where propane has been marketed and used as a substitute for HCFC-22 (R-22), a refrigerant that is widely used in home air-conditioning systems.
Other names for some unapproved refrigerants include R-290, 22a, 22-A, R-22a, HC-22a and CARE 40.
Home air-conditioning systems are not designed to handle propane or other similar flammable refrigerants. The use of these substances poses a potential fire or explosion hazard for homeowners and service technicians.