Is it bad if your heat pump hums occasionally?
I notice when ours kicks on it makes a loud hummin noise, its about 19yrs old I suppose
Yes thats BAD ! Most likely the compressor terminals plug is shot. And your not getting ample power. Then on a hit or miss it starts running. That will KILL the compressor. The sell a replacement terminal plug or you can get a universal terminal repair kit.
The other issue could be a failing capacitor, and or contactor (burnt points)
My suggestion is to you is STOP using the heat pump, and have a tech check the three things I have mentioned. With the age, they are going to push a new unit. So just brace yourself. With the humming issue present you may get lucky replace the terminals on the compressor, new cap, and contactor and shell live on to see some more life. Continued operation in this manner will result in a failed compressor
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