Stop in for a cup of coffee

Oops. I accidentally created a couple of heat engines in my windows with the new insulating foam panels. The gaps at the top were allowing the heated air in, and when it cooled against the glass it was being propelled out through the gaps on the bottom half. It was making a serious breeze of cold air around the bottom gaps accelerated by the thermal forces. Kinda like a heat pump in reverse.

Some gaffers tape around the edges shut it down and the garage temp went up by 1.5* in less than half an hour.

Gotta love understanding thermodynamics and physics.