Quote Originally Posted by stevepoppers View Post
The cold air may have made the probe think it was cooler, resulting in the thermostat letting the UTH work harder. Try to insulate the probe from the ambient temperature if you can, but not so much that it holds too much heat. I have a plastic cup over my probe. I don't think it helps much, but the apartment temps have been more stable lately.
I put a little piece of paper towel in front of the gap were the Thermostat Probe is so that should be fine.