I had my blower removed and cleaned a couple of months ago. Everything seems to work fine except for a drone.
I have a variable speed blower and when the unit kicks into LOW speed on one zone, it runs for 20-30 minutes on the heat pump. This is a very low speed and it has a very audible drone that resonates through the house, especially in the kids rooms.....its one of those drones that in a room, you can step three feet over and never hear it, but in certain parts its just annoying. When the unit ramps up the RPM or adjusts its speed for other zones, the sound disappears.
The unit is 10 years old and I was told it would be hundreds and hundreds to replace. So....is there anything that can be done for the motor to help isolate it or get rid of that drone? I know my tech can come out and adjust the low speed RPM, which would probably be a better idea anyway, but is there anything else?