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I had a new unit installed last year for around $7,000. Although brand new, the unit never really pumped out COLD air. Over the weekend, I fired up the unit and warm air blew out. I called the same crew that installed the unit last year for a checkup. Result: the unit was already out of freon. They diagnosed a leak in the line, but bc they didn’t hear a leak from the unit to the inside or near the coils, they believe the leak is behind the hallway wall. Before I start ripping up my walls to find a leaky pipe, does anyone have any suggestions or recommendations?