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?
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.