Refrigerant in a residential heat pump is designed to last indefinitely for the entire operational lifetime of the equipment, typically fifteen to twenty years or more. Unlike engine oil or fuel in a car, refrigerant is not consumed or burned up during the normal heating and cooling cycles; instead, it is sealed within a closed-loop copper tubing system where it continuously circulates, changes state from liquid to gas, and transfers thermal energy. Therefore, if your heat pump ever runs low on Freon, it is not because the refrigerant naturally wore out or evaporated with age, but rather because there is an active refrigerant leak somewhere in the system, such as a cracked solder joint, a corroded coil, or a loose valve fitting. A licensed technician must locate and repair the leak before recharging the system. You can verify long-term stability by confirming zero leaks pressure tests.
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