I live in Williamsburg Va and we also get those hot humid days as well. The first summer i was in my house i was seeing temperatures in my attic that exceeded 155F and my house is a single story and 1800sqft . I have been trying to make my house more efficient and two of the ways is by adding attic foil radiant barrier and slowly replacing the crappy blown in insulation with RockWool. So far this summer the hottest temp i recorded in my attic was 121F and that was with an outside temp of 102F while my brother was seeing a temp of 148F with an outside temp of 102F on the same day and his house is three stories and his attic is 1/3 the size of mine. I’ve only completed 75% of my radiant barrier and 1/4 of the RockWool project so far and I’ve seen significant improvements.
Before
After
