A meter of soil is a pretty good insulator. There is plenty of more newer houses built like this by enthusiasts, that practically go without extra heating or ac, because the sun warms it up enough in winter and the soil keeps it cool enough in summer.
A meter of soil is a pretty good insulator. There is plenty of more newer houses built like this by enthusiasts, that practically go without extra heating or ac, because the sun warms it up enough in winter and the soil keeps it cool enough in summer.