Hi David, 4% to 84% RH extreme enough for you? Yes Dampchaser systems with back covers on uprights can cope with such dramatic changes--on properly designed quality pianos. At 04:40 PM 2/23/2010 -0800, you wrote: >So many across the country install Damppchaser systems of some sort. In extreme climates do they really keep a piano close to pitch? > >David Ilvedson Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. Non calor sed umor est qui nobis incommodat mailto:pianotuna at yahoo.com http://www.donrose.ca/ 3004 Grant Rd. REGINA, SK, S4S 5G7 306-539-0716
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