Will post here and Building. We are building a 1 1/2 story home in Houston. The house will be 4000 SF and have a western rear expsoure with a lot of windows. We plan on using a full icynene system in attic and walls. Our GC A/C man has cut normal required tonnage by about 2 1/2 tons after running a manual J calc. Due to the icynene, he suggests installing heat pumps versus having to go with a high efficency and vented furance. I am ok with that and it seems feasibe and sensible. Our big draw here is cooling form 90-95 and high humidity to 70-75 at night. Icyneen should help als in keeping humidity levels lower because there is less air infiltration.

What are your thoughts on this concept? He also only recommends a max of 16 but sayswith Icynene's efficiency a 14 would be good enough.