Jump to Recharge Your AC - Recharge Your AC To recharge the refrigerant in your air conditioner, first shut down your AC unit, then follow the .Recharge your AC unit so you can relax and recharge in comfort and coolness. Now that you 've finished installing new refrigerant to your home AC unit, you . - Most homes with an air conditioning system manufactured before use R-22 as the refrigerant. The AC compressor circulates the refrigerant through the system 's pipes, metering devices and coils. Technicians charge an AC compressor at the outside unit.. - In these cases, the air conditioner may need a charge of coolant can also reset the unit directly at the source or flip the breaker to the AC unit..