At 9:30 PM -0500 11/30/02, Farrell wrote: >I have a big pile of copies of a full-color beautiful Damp-Chaser >marketing handout that describes how the use of their dehumidifier >system keeps the relative humidity (RH) of the atmosphere in the >area of the piano soundboard at maximum of 42% RH. Terry, This is a pet peeve of mine. I have just the last two weeks had two dampp chaser control units running in a customers house plugged into light bulbs. He has a curious mind and got the units with a rebuild that I did not do. (The piano has many problems still but that's another story.) One does not start to dry until the room humidity is over 70%, anywhere below 60% it tries to add water. The other one is always drying, never shuts off at New Orleans humidity. I had 30% in my shop yesterday, the lowest since last winter, he told me the unit was still heating. He has a fairly high end hygrometer, still only accurate to 7%, and is talking about a sling psychrometer. Meanwhile the dampp-chasers are only lighting the room. Neither is accurate enough to be in a piano. I have two humidistats at home that I hope to experiment on this week, but I dont think they are wonderful devices unless you have no other option. You'd be better off with room humidity control, IMHO. -- ----Dave ----------------------------- Dave Doremus RPT New Orleans algiers_piano@bellsouth.net ------------------------------
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