Quote:
Originally Posted by MiddleMike
Insulate the attic first for heat? Ok, fine, but then you don't seal the basement or insulate it, and that nice cool AC air you paid good money for quickly flows right down into the unsealed and uninsulated basement and seeps into the earth lickety split.
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The air might flow down to the basement
IF you have an open door (the small amount of draft beneath a closed door becomes inconsequential at the temperature delta in question), but then that air doesn't flow into the earth. The air remains contained in the basement, and
IF the earth is warmer than that air, it will conduct some heat into that air, depending on the R-value of your concrete/finished basement walls.
However, in reality, the basement is bound to be naturally much cooler. The earth and the thick concrete walls both act as high-capacity long-term ballast, and all through the summer my basement is nice and cool even if I haven't been using A/C -- and the front half of my basement is half-exposed with uninsulated wood walls instead of full-height concrete.
The situation in a car is far different. My guess would be that it really isn't strongly affected by temperature-related air density differences because the volume is so small, the height is so small, and the air is constantly moving, so insulation should be evenly distributed.
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