Many reasons. Sometimes the water table is too high. Sometimes the ground isn’t actually colder because it is a material that retains a lot of heat. Digging is expensive. And of course, most people don’t want to live underground.
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Many reasons. Sometimes the water table is too high. Sometimes the ground isn’t actually colder because it is a material that retains a lot of heat. Digging is expensive. And of course, most people don’t want to live underground.