The auto control works, you lower humidity just the point where there is
no condensation anywhere. It will maintain humidity so condensation does
not occur. Condensation leads to mold then rot of wood window frames.
Keep outside thermometer higher than any snow will ever get, my instaler
first put it at 6" I had him raise it way up to 5 feet in shade, N side.
Keep snow from resting on sensor, mine is under my elec meter. I close
airflow in summer with a damper and its mounted on the supply going back
to the return. The unit you have is superior to non thermostat controled
units by far. In fall clean the pad in CLR or similar acid solution.