If both heating systems raise the temperature the same amount, and neither one removes water from the air, seems to me the change in RH would be the same with either heating system. Perhaps it is in part related to maybe central heat blowing air into more places more effectively, etc. And maybe Americans do not practice energy conservation (crank the heat up higher - and thus lower RH more) as well as the Japanese. However, I believe it is true that there are areas of the North American continent that are much drier than Japan, and also colder - such that there is a larger drop in living space RH when the heat is turned up. So I'd have to say that at least in part, climate is a factor. Terry Farrell ----- Original Message ----- > The story I've heard is that in the US central heat is ubiquitous where > in the rest of the world it is not. Central heat dries the air in homes > more than space heaters regardless of the outside humidity so pianos > made for the US are made for a drier environment not drier climate. > > dp > > David M. Porritt > dporritt at smu.edu
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