> underground car parks tend to get hot too This is something that has puzzled me every time I park in the underground garage under City Hall in Palo Alto. It

> underground car parks tend to get hot too This is something that has puzzled me every time I park in the underground garage under City Hall in Palo Alto. It is always so hot down there compared to the outside air. I was about to ask if anyone knows why that is, and then realized I could search for the answer: https://www.google.com/search?q=why+do+underground+garages+get+hot https://www.google.com/search?q=why+do+underground+garages+g... Lots of interesting opinions there, including a previous HN thread. One discussion I liked showed up when I'm signed into Google but was missing from an incognito search: https://philip.greenspun.com/blog/2013/07/05/stupid-geophysics-question-of-the-week-why-are-underground-parking-garages-hot/ https://philip.greenspun.com/blog/2013/07/05/stupid-geophysi...