I was looking to add more insulation and had a roofing contractor up in the attic. He noticed I had inadequate ventilation and wants to add a ridge vent along the top off the roof. I measured the temp on the attic floor at 120F on a 80F day. For upstate NY is this a warm attic temperature?
I had heard that in Manual J you can specify attic temperature. How does this affect the load during summertime?