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  1. #1
    Join Date
    Jan 2013
    Posts
    12

    Heat Pump defrost noise change with temp?

    I am new to having a heat pump, this is my first winter. Last night was the first night below 20f outside that I was using the heat pump. The heat pump makes a growning sound for a few seconds when it begins the defrost cycle like the compressor is straining to start. Last night the sound became very loud to the point it woke me up. Sure Comfort 3.5 ton single stage HP. Is it normal for the compressor to strain more to begin the defrost on a colder night? Normal startup sounds fine, only notice the problem when it goes into defrost.

    Prior to last night I had switched to aux heat below 30F but in other posts I was convinced the HP was economical to use in lower temps. It still made the straining noise in with temps in the 30s but no nearly as loud as it did last night when temps got below 20F

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,318
    They can make some horrid noises going in & out of defrost. Not sure it varies a whole lot based on temps. I'd think warmer would be louder due to higher refrigerant pressures.

  3. #3
    Join Date
    Jan 2013
    Posts
    12
    Quote Originally Posted by BaldLoonie View Post
    They can make some horrid noises going in & out of defrost. Not sure it varies a whole lot based on temps. I'd think warmer would be louder due to higher refrigerant pressures.
    I would have guessed the same thing. This one only does it going into defrost. I guess I'll wait and see if it gets quieter when the temp goes back above 30's

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