I have a Mitsubishi Electric “MSZ-GL06NA” and live in NYC.
Why does the heat pump never stop when set to the dehumidify mode?
The apartment just keeps getting colder and colder but never any drier(?).
When will it ever stop or Does it need servicing?
My guess is your heat pump doesn’t have a good dehumidify mode. The thermostat does, but it’s just turning on the A/C. A good dehumidify mode is a very slight A/C and moves a lot of air. So, if your compressor doesn’t handle enough steps down, you’re spending a lot of electricity for not much effect. A dehumidifier with a continuous drain might be a better solution for you.