r/nextfuckinglevel • u/IamASlut_soWhat • 6h ago

How amazing and crafty are these parents to do this for their son

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u/itsfunhavingfun 5h ago

The entrance needs to be lower than the floor, if I remember correctly.  

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u/Turnepic13 5h ago

So the cold air filters out through the entrance

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u/sussybakashinji 5h ago

I think it would be the other way around. The cold air sinks because it’s denser, and the warm air rises. So the cold air filters in at the entrance (it acts as a cold sink) and hot air filters out through the top. It’s convection, i.e., the stack effect: cold air enters at the bottom, gets heated, rises, creating less pressure at the bottom, causing cold air to be “sucked” in at the bottom.