>>I do it often, and upon looking at the card inside, I find that the room RH% when last tuned was 26%, and the room RH% today is 67% - or whatever. Attached is a photo of the back of one of these cards. It won't matter where the A/C duct is in relation to the piano with numbers like this. And this is the norm. Ron N<< You are correct, Ron, that numbers like that do present problems for tuning stability. But that isn't really what the discussion between us has been about. You refuse to acknowledge that a/c air coming out of the vent is at a very high RH. Even here you forcefully assert that it makes no difference where the vent is in relation to the piano. One of the pianos I previously spoke of encountering with the a/c blowing on it had a full dampchaser system with a back cover. Yet it was still going substantially sharp. If I am to take your advice then, the a/c vent blowing on it is of no consideration. Is that really what you are advocating? I hope not. Because lots of other techs reading this list rightfully (most of the time) take what you say to be gospel when it comes to piano care. This writer included. Dean
This PTG archive page provided courtesy of Moy Piano Service, LLC