Need some A/C help. My downstairs unit is blowing but the temperature will not drop below 76 even if I set the thermostat lower. I compared the output temperature of the upstairs unit (that is working fine) to the downstairs and the upstairs unit (working) is blowing significantly colder air. Any idea on where to start looking for the problem with the downstairs unit? My filter was definitely in need of a changing so I may have brought this on myself.
thanks
thanks
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