Dear Glenn & List, The Dampp-Chaser system is not fighting itself. It just takes turns raising relative humidity and lowering relative humidity to maintain an average of 42%. This average humidity results in stable wood moisture content. You will see charts, studies etc. but I can attest that the piano will tell you if the system is doing its job. If the pitch is 10 to 20 cents flat in Feb. and 10 to 20 cents sharp in Aug. then you need a system. I have at least 50 systems in our local schools. The pianos with a system are never more than 2 cents sharp or flat at anytime during the year. Pianos without a system (or with systems that are not kept plugged in) suffer the pitch changes as stated above. Our indoor humidity goes from 15% to 80%. For those who have had no experience with Dampp-Chaser systems, all I can say is it really works. Pianos that have them properly installed and maintained are in far better condition than those without. Best Regards, Steve Cunningham P.S. Glenn, when are you visiting the D.C. area again? Please stop in!
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