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> I circulate air in my house every day

Might be hard to do that in really cold weather. I live in a place that's very warm and the windows are always open, so I can't relate.



Two box fans + windows (ie, apartment) or a whole house fan in a larger house can circulate air quickly in 15m.

I find useful to do that even in winter (maybe not in North Dakota winter).


Energy recovery ventilators make this possible. There are even inexpensive window-mounted units.




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