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Hello, I need the full model number of the unit so that I can check to see if it is an unloading or two speed model of the copeland compressor.
Meantime set the thermostat on cooling and down to 60F as a brief test only and tell me if the droning stops or changes.
We can go from there.
Hello again, how is it going with the heat pump? Have you done the load test I mentioned?
Let me know, we can go from there.