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Temperature changes of winter and summer should remind you to get a hygrometer, even if you don't have hardwood floors DSC_0568Colder temperatures usually mean drier air – inside and outside. That’s why hardwood flooring manufacturers issue written guidelines that the owner must keep indoor relative humidity levels between 39 and 60 percent. When humidity drops too low, the floor with shrink. Too high, it will expand and cup. But most people have no idea what their indoor humidity levels are at any given moment. And there are more reasons to know than just for maintaining your flooring’s health. It is important for your own health, too.