I would suppose allot has to do with outside humidity (maybe). My home in Florida consistently has 70% to 75% relative humidity (RH). Even if I turn the temp down, and the AC runs for a long, long time, RH does not drop below about 70%. Most homes where I service pianos and have measured (I don't do it at all homes) range from about 55% to 80% RH. All these RHs are during the rainy season in the summer. BUT, my shop, where I typically run the AC constantly during the summer when I am in there, will go down to about 38% to 42% RH within a half hour of running the AC. I have a dehumidifier running off a "dry" calibration Damp Chaser humidistat, which kicks the dehumidifier on at about 48%. That way my shop stays between 38% and 48% RH all the time. Why my shop AC runs the RH down to 40% RH quickly, and the house AC does not get it below 70% RH or so, I do not have a clue. They are the same type of AC, and both structures are concrete block. Terry Farrell Piano Tuning & Service Tampa, Florida mfarrel2@tampabay.rr.com ----- Original Message ----- From: "Diane Hofstetter" <dianepianotuner@hotmail.com> To: <pianotech@ptg.org> Sent: Sunday, August 13, 2000 2:18 AM Subject: Re: Air Conditioning > Coming from a cool part of California, I wasn't prepared for the humidity > readings I kept seeing in my room at the Crystal City Hyatt. All these > years I had read that AC took moisture out of the air and here I was reading > 78% on my brand new Damppchaser humidistat. Finally one tech told me that > in many large buildings such as the hotel or university buildings they are > using a new type of airconditioning that actually puts moisture back into > the rooms. That probably doesn't explain your customer's problem though. > > Moisture is a constant problem for us here on the coast and under the giant > Redwoods. Next week I have to go back on a Steinway grand I rebuilt about > ten years ago; customer complains it is too heavy. I asked her about the > damppchaser, she says "Oh, we don't want to bother with that." It's in an > unheated, non-insulated summer cabin in the woods :-( > > Diane > > > ----Original Message Follows---- > From: staytuned@idirect.com (John Lillico, RPT) > Reply-To: pianotech@ptg.org > To: pianotech@ptg.org > Subject: Re: Air Conditioning > Date: Sun, 13 Aug 2000 01:15:06 -0400 > > >I think Larry Messerly is both right and wrong. AC does indeed filter > >water out of the air, but don't expect uniform results from all AC units > On Mon, 27 Mar 2000 02:15:54 -0700 "Robert A. Anderson" > <fndango@azstarnet.com> wrote > > >at all times. I have measured humidity levels between 35% and 55% > >approximately in homes in the Summer with AC running. I conclude that > >not all units are equally efficient, especially when the air is being > >cooled to a greater degree from a high moisture content level. > > > >Bob Anderson > >Tucson, AZ > > Rob, > > The RH readings I'm seeing this month are about 60% on average (the record > was 82%) and most are air conditioned environments. I asked a heating > engineer about this. He said that most central air units are too large for > the area they cool. When temperature drops too quickly the units shut off > leaving RH at these high levels. > > I long for a good snowfall. > > John Lillico, RPT > Oakville, Ontario > > > > ________________________________________________________________________ > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > >
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