21+ How To Recharge A Window Air Conditioner Gif. Then, turn on your window ac unit and ramp it up to its highest power setting. When your window ac unit stops blowing cold air but is functioning properly in every other regard, it is likely low on coolant.
This means that the unit will have to be recharged with a fresh infusion of coolant, likely freon.
When this happens, the unit will need to be recharged by adding freon. Operate the air conditioning unit, check the subcooling, and make sure that the sight glass is clear, stop the air conditioning unit if the subcooling is inadequate. However, units get old and can develop leaks. There are many internet forums and videos of people utilizing r134a refrigerant to recharge window air conditioning units.