@traxila , @winfield100 , link to more info on this EPS stuff please? Thanks.OT,,,,,
@traxila
SIPS
Structurally insulated Panel Systems
usually EPS foam between 2 oriented strand "plywood" that can be very long.
There is/was a SIP School near Shepherdstown, WVa.
house can be like a thermos bottle, extremely insulated, almost no drafts (infiltration/exfiltration)
Also look at what the Solar Decathlon kids did. totally could heat a house with a 1,600 watt blow dryer so insulated
they were all covered with big PV systems and had EV's but no Tesla's back then