Hi list,   We have a classroom/recital hall with a huge humidity problem.  Has anyone else had this problem:   The room seats about 200 and has a Steinway D from the late 70's and a harpsichord.  The room can change by 30-40% or more in a day!  Over the T-Day  weekend I put in one of those small humidistat from Pianotek and it showed a range of 24-80%!!!  Not only are my tunings worthless for recitals if I tune in the morning and the concert is in the evening (as some days, that is the only time the room is available),  but it has got to be wrecking havock on the instruments. It doesn't have a piano life saver system in it, and I wonder how much it would help with such wild swings.  I and all the faculty have complained about it (apparantly for years prior to my getting here this year) and nothing gets done. Can I do more that just cover them and go ahead and put a DC system on it?  They do have thick blanket style covers on them. Sweating to the oldies in Lincoln.... Paul