<html> <body> Thanks Terry. At 01:31 PM 8/8/2007, you wrote: <blockquote type=cite class=cite cite="">"With a DC system the hygrometer controlled dehumidifier..."   Hygrometer is an instrument one can use to measure relative humidity in air. Humidistat is an electronic device that senses RH and can regulate a dehumidifier and/or humidifier.   Terry Farrell <dl> <dd>----- Original Message ----- <dd>As Steinway generally puts is, controlling the whole room is best but not always feasible and when that is the case a DC system is the way to go.  If I understand you correctly, you have measured the humidity and have not noticed any lows dipping into the forties during the active season there.  If that is the case, a DC dehumidifier only system with under/back covers would prove adequate for the summer performance season.  The low winter temperature if kept steady will probably keep a steady humidity profile for the pianos.  With a DC system the hygrometer controlled dehumidifier bars will shut off when they are not needed and you don't have to worry about baking the piano. <dd>I doubt a full system with humidifier would be properly maintained if the camp is shut down for the winter.  You mention they are in a room kept to 50 degrees.  I don't know how cold that area gets but it is possible that humidity levels are acceptably high-enough during the winter.  Of-course putting a hygrometer in the room that tracks high and low extremes would reveal any problems.  Since it is a presumably small room it may be possible to plumb in a low maintenance humidifier if that is needed for the winter. <dd>Good Luck, <dd>Andrew Anderson </dl></blockquote></body> </html>