Originally Posted By: Chris142
My house is not well insulated. I get that. It was 106 today and we had the coolers on which kept the house bearable. The sun set and its now 85 degrees outside. I turned off the cooler and now its 96 in the house! Why did the temp go up and above the outside temp? My wife thinks it's built on lava.
The simple answer is to have a white roof. Here in South Florida, we've learned that radiant heat from a dark roof permeates the house. It matters very little if the attic is vented. The heat is radiant, and comes right through fiberglass insulation and drywall.
Not unlike a portable radiant heater that does not heat the air, but instead heats anything in it's path.
EDIT: Guess what color my roof is? White, barrel tile. I have a very efficient Florida house and my utility bills are very reasonable. The builder thought I was crazy when I declined the expensive attic insulation package, and instead went for insulated low-e windows. Unlike my old home, I can't feel any radiant heat from above.