Noise from return air side of force air
My house was totally remodeled and I upgraded with forced air and a heat pump. I have a supply vent in every room, yet only 2 return vents... one at each end of single story house.
Only the return vent closes to the furnace makes an annoying whining sound (wa, wa, wa, wa... is only thing I can say it really sounds like). Does anyone have any suggestions to make this sound go away?
When I shut down the entire system, the noise goes away. If only the fan is on, the sound comes back. Could there be a bearing of something going out on the fan? Or possibly something else?
Please help before I lose my flipping mind!