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 (2 children)

I was thinking of a closed loop system not pumping moldy humid air into a house.

Your idea isn't bad but does need a space big enough for a technician to service the external unit. Also, the external part of a heat pump isn't supposed to be enclosed. Not sure if a tunnel counts as enclosed or not.

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