To protect your home's structure, if the outside temperature is:
20 to 40 degrees, indoor humidity should be no more than 40 percent.
10 to 20 degrees, indoor humidity should be no more than 35 percent.
0 to 10 degrees, indoor humidity should be no more than 30 percent.
Minus-10 degrees to 0, indoor humidity should be no more than 25 percent.
Minus-20 to minus-10, indoor humidity should be no more than 20 percent.
Lower than minus-20, indoor humidity should be no more than 15 percent.
Minnesota Office of Energy Security
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