- So concrete is being used as a monolithic structure in eco friendly houses now, due to the thermic properties, yes it takes a long time to heat but also to cool.
So building a fireplace into a concrete wall takes time to heat up, but once it does it turns the entire wall into a radiant heater. In the summer it still takes a long time to heat up, longer then the daylight if only using the sun.
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the examples I’ve been seeing, use an inner and outer layer of concrete, with urethane foam or equivalent inbetween.
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I have no solution to multiple floors lol
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several municipal building codes have started allowing straw bale houses, rammed earth houses, container houses, as long as an engineer signs off on the process in question. All you would need is that stamp, and to have it marked as an eco-friendly home.
I also spent a number of years as a contractor 