I agree a 5 ton system would be for a pretty large house. The house here is about 3100 sq ft. It's pretty damn big. The former owners who tripled the house size in the 70's did about 1" of spray from insulation around the entire house and the attic. I had another guy come out today and said that a 4 ton system would most likely take care of everything.
Stevehull: Yeah I think I jumped the gun on this. I'm going to go through a winter and then use my performance data to size the system. I just moved here in May so I haven't been through a winter yet and I don't have the numbers :-/ I'll have to revisit this post in a few months once the cold starts getting going and see how I'm fairing
