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I need some very precisely measured temperatures and pressures all taken at the same time, and only after the system has been running for 5 minutes with the system set to an extreme temperature in Cooling mode (60F) and heating mode (90F)
indoor air temperature taken at the return air grill
Outdoor air temperature/
Air temperature taken at one of the supply air grills closest to the air handler
Air temperature taken at one of the supply air grills furthest from the air handler,
Use the *same thermometer for all measurements,
Tell me if the suction line as it attaches to the compressor is cool, cold, sweating or frosty at the compressor.
We can go from there,
You are entirely welcome.