Farrell wrote: > Then, what happens when RH goes up to 75% or more? I should think that it > means that the system would just stay on, and not lower RH to the targeted > value, if it is apparently maxxed out trying to lower piano RH when room RH > is at 65%. I don't know that it is actually completely maxxed out at 65%, since I don't sit there and monitor it. However, that is exactly what I am trying to achieve - to max out the system at the upper end, so that there is less cycling. The sizes I use for our climate seem to work. There is little if any problem with pianos going sharp, even if they were last tuned at 40%. Now, they may slip sharp at the very top end, but that happens rarely enough not to be a significant problem. Paul
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