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There is no particular dampness below the stairs. That hasn't changed in 20 years of this hardwood flooring. The only change is the temporary introduction this summer of A/C. This month has been typically humid and hot.

The stairs lead to a finished basement where there was no a/c, although immediately below the stairs is a closet which includes the sump. Most stairs are warped -- oak. The house is in Quebec. Could it be, when the summer occupants who brought portable a/c with them and left a week ago, that...

In my case, this is the first summer that there was a/c. Could a/c be the cause?

Upon returning home at the end of summer, the hardwood on the stairs was warped and buckling, but not in the main room. The only difference after 20 years is that the occupants brought in air conditioners for the summer -- could that be the cause?