Can a conditioned attic space be too big to work well?
I’m a builder and would like to spec my homes with a foamed conditioned attic. I’ve done one home already that was about 3,000 s.f. (single story, 9/12 pitch roof) and it seems to be performing well. I’d like to do this on all of my homes, but have concerns about the larger homes performing well.
The concern is that the sheer volume of the attic is so large, I wonder if the HVAC systems can’t be downsized much or even worse, may have to be larger. What are your thoughts on how well a conditioned attic works on a 4,000 s.f. to 5,000 + s.f. single story home with a 9/12 (average) roof?
The homes are being built in Oklahoma City area which is a mixed-humid climate. The walls will be 2×6 net and blow fiberglass with a frame seal and Energy Star qualified windows will be installed. I plan to meet all mechanical and fresh air ventilation requirements. I appreciate any comments.