---------------------- multipart/alternative attachment Mark, Just a couple ideas: 1. I'm sure you're right about the RH reaching 10%RH. It's my understanding that a sling psychrometer will be somewhat more accurate at the low end (anyone who can confirm or debunk this please?). Using such a tried and true tool doesn't hurt when making the case, either. 2. One way to dramatically improve your situation economically is to put half-systems in all pianos - just heater bars and humidistats. It's amazing what you can do by cutting out most of the effect of the high summer swings. Bill Shull In a message dated 1/13/2006 5:12:13 PM Pacific Standard Time, pianotech@nhpianos.com writes: After years of complaining about the environment in the Music Building at a school that I service, there finally seems to be some movement towards at least exploring a solution to the problem. I have been asked to provide a range of both humidity and temperature that would be considered the minimum requirements for the pianos. Right now, humidity swings between 20% and 70%, measured with my radio shack digital thermo/hygrometer, although I have a hard time believing that it doesn't drop lower than that. Temperatures in the heating season frequently reach into the upper 70's, with a few rooms hitting well above 80F on occasion! I have suggested that anything outside the 30% - 60% range is bad for the pianos, with an ideal of mid 40%'s, but I don't know how to answer the temperature question. Any suggestions? Mark Dierauf, Concord, NH ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/cf/f8/77/7a/attachment.htm ---------------------- multipart/alternative attachment--
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