Insulation Interesting debate Written by U.S. Cooler on January 9th, 2009May 28th, 2013. 1 Comment This is a link to a debate on which insulation is better (extruded polystyrene or polyurethane) on the HVAC-Talk forums. Several of the posts mention U.S. Cooler. Learn more in our FAQ insulation section. Be Sociable, Share!