[cbo100]

It's very geology dependent, but they do this in Coober Pedy, a town in Australia where underground building is common for cooling reasons.

https://en.wikipedia.org/wiki/Coober_Pedy

I don't think it's something we will transition to in general "for survival" though. Building regulations should just catch up and enforce appropriate insulation levels and building methods for the given environments.

[marak830]

Also there is zero humidity there. I would imagine that would affect an underground house a lot.

Source on humidity: did a 3 month tour there as a chef - never again.