Are all types of wood similar with respect to their ability to conduct heat or are some types better than other?
I'm looking for a go-to, cheap type of wood to act as the barrier in windows around window air conditioners; most importantly around unused A/C's left installed during the winter.
It's pretty trivial to come up with solutions involving multiple layers of various materials but I'd really like to stay with the simplicity and ease of a single piece of wood.
1/2" plywood doesn't really do a good job of keeping heat in and cold out, at least not compared to double-paned glass.
The A/Cs themselves are a good insulator and all gaps are well-sealed.