I did consider using a short piece of heat tape, but I prefer starting with a passive approach that doesn't require power. If I still have trouble with it freezing, I can also try adding a strip of aluminum into that gap with a section sticking out into the room to conduct more room heat into the hole.
I did consider using a short piece of heat tape, but I prefer starting with a passive approach that doesn't require power. If I still have trouble with it freezing, I can also try adding a strip of aluminum into that gap with a section sticking out into the room to conduct more room heat into the hole.