Originally Posted By: Susan
It would take quite a while of sustained heat to heat up the soil around the shelter to the point that it would be a real oven.

I'm concerned with having air cool enough to breath. Keeping the soil cool is a different problem.

Quote:

Since heat, by its very nature, must rise...

Melting ice is an exception. Convection normally rises but I don't think any other form of heat transfer prefers up or down.