I bought a second dehumidifier several month ago for my basement because 1 was not enough to maintain the humidity for the entire basement. I've had the humidifiers set on "continuous" for several months (rather than a set humidity), but was wondering if that might cause issues with the air being too dry. In other words, will the floor joists or subfloor on the first floor (basement ceiling) shrink and/or crack if they are too dry? I just started noticing in the morning when I get up the floor creaks a lot more, but after walking on the floor for a while, it doesn't creak anymore. Is this because the wood shrinks when the air is less humid? The house was built in the early 50's and has pine floor joists with tongue-and-groove boards for the subfloor. I live in New England so the humidity level changes throughout the year.
Thank you in advance for your help.