When I build my new house I will use a 16 seer 2 stage Hvac system , foil tyvek instead of regular white (extra r-value 1) , I will silicone my bottom plate to slab instead of the foam pad, tech shield foil backed roof decking, open cell foam insulation in walls and closed cell on rafters . Seal all hvac ducts and boots with mastic. We did this same setup on a house
that was 4200 sqft area and
The owner says the electric bill is under 300 a month in the summer. And this is with gas water heaters not electric
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