Cooling involves ‰gheat sinks‰h as well as shading
In China where soil is stable, underground houses surround sunken courtyards
The rooms depend on the earth for their ‰gheat sink‰h in hot weather‰cand as a supplemental heat source in cold weather
The courtyard is exposed to sun by day, but radiates to the ‰gheat sink‰h of the cold night sky