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Hmm. Much of it is covered by drywall.
Interesting. Most ductwork runs in the attic space or crawlspace.
Fortunately the whole state is solar cooled/heated.
I have a 2100sq/ft "adobe " home in Arizona and even though the temperatures have been very high, we can keep the house nice and cool, and we only pay $80. a month or less for electricity. I have all LED lights, and use an evaporative cooler for cooling.The walls of the house are almost a foot thick, made of burnt adobe brick, from Mexico. It was built in 1956. what helped the most was convincing my wife to use our solar clothes dryer! Rick.
Switch to a different electric supplier with lower kWh cost? Mine is locked in at 6.550 cents/kWh until May of 2022. I keep getting offers that will "save me money" at 9+ cents/kWh.
We have two choices. (1) Indiana/Michigan(2) None.