Okay! I have a "theory"
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CONVECTION EXCEPTION
So you all know how convection is how hot air moves up and cold up air moves down. But this isn't always the case... Please read =>
So my guess is that convection only applies to OPEN rooms. If you have a room that is closed off somehow from the opened air, it won't matter whether it's high or low.
For example. A garage. It is downstairs in your house and supposedly has a door. But is it always cool? No. Because the room is closed off from the other air in the house it just changes the temperature to whatever air has gone in last (from outside or a car etc)
Example two. An attic. I was at my cousin's house this past weekend and DANG it gets really hot in their upstairs... :P But i went in their attic and boom! Cold air comes rushing out. (not due to the AC) But it's also up and it was packed with stuff, but it was still much cooler than the upstairs. Then again it was closed off furthermore proving my point of the convection exception.
Thank you-
Dapro, Amateur Scientist~~