Hi Barbara,
For every two degrees F difference between the storage and the stage tune about 1 cent sharp. The lights will still make the pianos go miserably out of tune.
I don't have a lot of data for this yet--mostly what I have garnered from tuning in rural Churches where no one turned on the heat for me.
Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat
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A colleague and I are going to be tuning pianos for the Illinois Music Educators Association All-State Convention. Of course, the venues will store the pianos in not very well heated storage rooms, where we will have to tune.
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