I'm hoping someone can explain why my house retains heat so much. I have an older house built in the 50s. We completely remodeled last summer. New windows, new roof, new insulation in walls, new doors. Everything is practically new except kitchen. R13 insulation in walls, poly vapor barrier on exterior walls. Blown insulation in roof to r38 white steel roof, white vinyl siding. My house retains heat like crazy now. Like today it is 64 outside and 74 degrees inside. Someone please explain to me why it is so warm in here.