Second Floor Is Too Hot to Sleep in Summer
My sibling has a standard 4 bedroom, 2.5 bath, 17 year-old 2-story home with a first floor master bedroom. The foyer and great room have 2-story ceilings.
The second floor bedrooms are so hot and uncomfortable at night that my sibling had to place a window A/C unit in the one that is occupied. (The home has central A/C and the first floor is always comfortable.)
What can he do to diagnose and fix this problem? Could it be that he needs an attic fan, or better insulation in the attic? (The attic is not livable space.) Is there a solution without a dual HVAC system?
Thanks for any help.