There's a place called the Hockerton Housing Prokect in the UK which has no heating and the min indoor temp in December is 16 degrees.
Those houses were built 30 years ago.
Off grid works period, it has done for generations!
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Yup. Even on Turtle Island thermal mass heating for homes was around for thousands of years. Colonization enticed us to walk away from those concepts, but the time is now to return.