Terry, The Dampp-Chaser brochure states on page 7, "The Dampp-Chaser Climate Control System maintains your piano at an average 42% relative humidity as recommended by major piano manufacturers." I am taking their word for it. Of course if you are installing only the control and a heat bar, there is nothing to prevent the piano from getting drier than that. Regards, Clyde Hollinger Farrell wrote: > > ....the piano's pitch > > will drop as the humidity inside the piano drops to around 42%. > > Have you or anyone else ever measured the relative humidity fluctuations > within a vertical piano equipped with a Dampp-Chaser system? How do you know > it goes to 42%?
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