On Dec 14, 2008, at 5:40 PM, Don wrote: > Have a look at a chart. When temperature drops RH spikes up. Buildings > being what they are they soon reach equilibrium again at what ever the > "usual" RH was. Then when temperature is raised RH spikes downwards. > Pianos > do not like this from a tuning stability point of view. Actually, that was a major point of my post: that we should be looking at this as a combined RH and temperature event, not just a temperature swing. If both change simultaneously, it is hard to distinguish the effects of one from the effects of the other. In any case, we should be aware that, in all likelihood, both have changed over that week or two of having the heat lowered. Regards, Fred Sturm University of New Mexico fssturm at unm.edu
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