Question: If I slow down the fan speed on my inside air handler will it effect the outside unit? I have a amana 14 seer heat pump.
Answer: I would not be recommended slowing down the fan speed on a heat pump unit because the indoor coil becomes the condensing unit in the winter and this might cause high head pressure thus damaging your heat pump unit. If you have gauges you could try to lower the speed and see if the head pressure goes up too high or not. There should be a graph type chart that is located inside the control box of your heat pump outdoor unit. On the paper it should show a graph with recommended pressures, both high and low pressures for different temperatures. If you can lower the fan speed and stay in the manufacturer’s recommendations then you should be OK.