I don't think we're really ruining the house by keeping the humid at 40% or so in the winter. We've lived here 35 years, and have replaced most of the windows with new thermal casements, but the old windows were original and 75 yrs old, and already rotted. We keep the new ones painted; the general insulation is pretty good and the attic doesnt get too damp, etc. I guess our health is more impt, as well as the instruments. These older houses have thicker walls - more insulated space, almost 2" more. Margaret
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