What type of refrigerant is used for RV roof ac?

Most RV roof air conditioners use either R-22 or R-410A refrigerants. R-22 is an older refrigerant that has been phased out due to environmental concerns, while R-410A is more commonly used in newer models because it has a lower impact on ozone depletion. It's important to check the specifications of your specific RV AC unit to determine the correct refrigerant type.