Ed, If it is a Yamaha in an ebony finish you do NOT have to consider the finish. This is polyester and will not check or crack. The piano will die long before the finish will. I agree with the rest of your post John. Temperature and Humidity are the culprits. Protect your investment and cover the windows and enjoy such a fine instrument. Ed Tomlinson (two Ed's are better than one) << Hi Ed, If it was my piano I would buy drapes. Not only do you have to think of the finish, but the fluctuations in temperature, do not help the tuning stability. I hope that it is not by direct heat, from radiators as well. Regards, John M. Ross Windsor, Nova Scotia, Canada >>
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