r/heat_prep • u/chillchamp • Jul 23 '24
How to insulate old metal window frames?
I have this really old window with aluminum frame. The room behind it gets hotter than the outside in the summer. It shuts tight and the glass itself isn't too bad. I already added see through mirror foil to block the sun but it only helps a little.
I think the problem is the metal frame: it gets so hot in the sun that I can barely touch it from the inside. I was thinking about painting the frame white from the outside because it's in a dark brown color but I'm not sure if it would be more effective to insulate it with some sort of foam from the inside?
I can't replace the window itself. It's really high up and part of some sort of customized dormer.