What can I say some do and some dont here. When they first started with heatpumps the 4 valve was turned on for heat. But if it failed in the winter you didnt have heat just cool. So the big minds said lets let it in heat all the time. Then if some one wants cool we will put power to it and open it for that time and if it dont work they can still have heat.

Now some make a noise some times you can just bump it and it will stop.
One more thought here a programable tstat dont pay on a heatpump. When you set it back on heat snf it goes to pick up the heatit turns on the AUX heat so you spend what you saved. On cool set it and let it alone. The main thing for the AC is to get the humidity out of the home. AS it get the humidity down you will push the tstat up some. Cause you feel cool. And no it should not be on when you are not calling for cool
My mistakes dont define me they inform me.