I’m surprised in this thread that no one mentioned the need to consider new linesets when replacing the AC. For newcomers, several years ago they discovered that copper linesets that are routinely buried in the concrete slab were not adequately protected. As a result many began to leak freon due to corrosion caused by chemical interaction with cement. When they replace linesets they usually run the copper tubing thru the attic. That also allows for better insulation around the linesets.
Lineset: The term for the copper piping which carries refrigerant from the condenser outside to the evaporator coil inside, then back again in a cycle. The lineset consists of a smaller liquid line for cool, high-pressure liquid refrigerant, and a larger suction line for hot, low-pressure gaseous refrigerant.
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