Steven, your information is amazing, and I'm sure that many other builders/ renovators are going to use it for years to come. It's hard to find info. I'm all about cheaper. And yes you are right the frost line is not much at all here. I will not insulated my basement/root cellar any way because I want it to be the temp of the ground.
I'm still concerned on duct because of the length of the house. I may have to use 10" in some places. Or 2 10" lines with other lines branching of with 8" and 6". That is just a matter of running the numbers though. And if I go with a deauperheater, I really want my hot water tank in the same room with my unit. And right now my house design does make room for that. BUT that can be changed.
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