Chapter 17

Refrigerant: What Homeowners Should Know

Refrigerant is the working fluid that moves heat through an air-conditioning or heat-pump system. It circulates in a sealed circuit and changes pressure and state as it moves through the compressor, coils, and expansion device.

Homeowners do not need to handle refrigerant. Refrigerant service requires specialized tools, training, and compliance with applicable environmental rules. Never loosen refrigerant fittings, cut tubing, attempt a do-it-yourself recharge, or release refrigerant into the atmosphere.

If a system is low on refrigerant, the important question is why. A properly operating sealed system should not routinely need refrigerant added. A qualified technician should investigate possible leaks, explain the findings, and discuss repair options.

Different systems use different refrigerants. When replacing equipment, ask which refrigerant the proposed system uses, whether it is compatible with the indoor and outdoor components, and what the long-term service implications are. Do not assume that refrigerants can be mixed or substituted.

If you see oily residue around a refrigerant connection or suspect physical damage, keep clear and arrange professional inspection. Do not touch frost-covered tubing or attempt to thaw an iced coil with tools or hot water. Turn the system off if instructed by the manufacturer or technician and seek service.