Underground housing, underground businesses, etc. Would that be better for the environment + possibly save on energy costs? Also possibly safer in certain scenarios like tornadoes etc.

Potential issues that immediately come to mind are ventilation, earthquakes, and flooding. But it's not like underground dwellings/basements/etc. aren't a thing, so maybe those issues have been addressed in ways I'm not familiar with.

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[–] 1 point 2 months ago* (last edited 2 months ago) (1 child)

Ground loop heat pumps are already a thing.

As for maintaining the unit, you just have a service panel you can remove to access it.

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