I stated "10% IRH", or "Indoor Relative Humidity"... it's a bit of an exaggeration, except on the very coldest days when the furnace is really working hard to warm the air a lot and greatly increase its ability to hold moisture, i.e. drying it. Outdoor relative humidity doesn't vary that much in the winters here, but the temperatures do. Summers see high temps in the 90's (F). I think that nearly every winter I've been here (since 1985) we've had a week straight where it doesn't get above 10F, and a number of days in a row that it doesn't get over 0F. If outdoor air is at 50% RH at 0F, and then gets heated to 65F, the RH is MUCH lower. I have no idea exactly how low, but I'd venture a guess that it's below 25%. RH is a factor of Dew Point and Temperature. The dew point of outdoor air in the winter may be -20F and the outdoor temp is -15F. When that air is heated to 65F indoors, its dew point is still -20F, thus making it very very very dry. If the piano was on the front porch, at least it would kill the mice, but no one would be able to play it and I certainly would not be out there tuning the thing. And in my six years of doing this I've only tuned one on the front porch! (and it did get moved in for the winter, then they added on to the house, so now it can live in the house, too.) Paul Bruesch Stillwater, MN On Sun, Jul 25, 2010 at 9:14 PM, Matthew Todd <toddpianoworks at att.net>wrote: > 10% RH? I am assuming that is outdoor. Unless the piano is going to be > located on the clients front porch, lets hope their indoors isn't that bad. > > ***TODD PIANO WORKS* > Matthew Todd, Piano Technician > (979) 248-9578 > http://www.toddpianoworks.com > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100725/bb308dc7/attachment.htm>
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