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Heat pump is humming loud>

We have a 3 year old heat pump. When the heat kicks on, it hums really loud. No rattling just hums The weather has turned really cold this week, & it sounds like its running hard, Normally we just hear it kick on & then its quiet.

The noise is coming from under the house (possibly the air handler) The unit outside sounds normal?

We are clueless about heat pumps - any ideas?



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  • Dale Koehn
    Dale Koehn May 11, 2010

    Have you had your system maintenanced lately ? do you know if your airhandler possibly had a filter in it and was never changed or taken out ? is the line set running from the unit, touching something under the house? if you could get back to us and let us know, thanks

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When the heat is not on. Go to the T-stat and turn the fan to the on position. With the blower now running is it making the noise? If so you probably either have something in there such as the filter that was mentioned, a piece of paper etc. or one or more of the blades on the blower wheel is vibrating. Don't let the condition persist w/o having it checked out or you may turn a simple fix into a costly one.

Posted on Jan 22, 2009

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