The temperature outside is about 20° my thermostat is set to 68° I have a heat pump unit it does not turn off once the set temperature is reached it does not go above 68° but maintain 68° and the unit keeps running the question is how do I prevent this from happening right now the heat is turned off And the temperature is staying at 68° please help?

  • 1
    If you set the thermostat to 65 does the unit turn off? It's possible that 68 is right at the maximum temperature that your unit can produce given the outside temperature and the thermal load of the home.
    – jwh20
    Jan 20, 2020 at 16:03
  • There are outside air temperature switches that prevent the compressor from running when it is too cold. Of course then you have to rely on emergency/aux heat.
    – JPhi1618
    Jan 20, 2020 at 16:10
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    OK I set the temperature to 65° turn the unit back on remember it’s sitting at 68° now it momentarily ran then it turned off it will be interesting to see that when the temperature goes down to 65° will it continue running again I’m not sure but thank you for the advice I will get back to you
    – MR C
    Jan 20, 2020 at 16:17
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    @GeorgeAnderson -- if the OPs system is modulating/variable speed, it could be throttling back instead of cycling... Jan 21, 2020 at 0:18
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    It’s a YORK unit mod.#YHJR36S41S4A
    – MR C
    Jan 22, 2020 at 13:47

1 Answer 1


Depending on the exact details of your heat pump, it may be functioning exactly as designed.

Modern efficient heat pumps are commonly variable speed (may say "inverter drive" or something like that), so that the compressor speed can be matched to the load

  • more load, more speed, more power
  • less load, less speed, less power.

So, rather than overshooting and turning off until the temperature falls, they simply slow down to match the output to the load and keep running, maintaining the temperature as set.

An additional factor with cold climate air-air heat pumps in cold weather is that they occasionally need to defrost the outside coils.

  • The unit inside is PEME34136S001 36000 BTU
    – MR C
    Jan 22, 2020 at 13:52

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