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Ahhhhh.... that explains it.... Not many people know this but Northern Maine sits on a huge subsurface volcanic plate-tectonic motion area. Heat from these plates conducts upward very slowly through your underlying bedrocks, so that this heat source within the earth is continuous through the cold winter months, and thus accommodates an equally consistent transfer and loss of heat through the surface, thus keeping your garage floor and the underlying soils from freezing.... ....