[CAUT] FW: Temperature/Humidity range

[Mark Dierauf]

Thanks Ron, Fred and everybody else that chimed in. This is exactly the
kind of info I need!

- Mark Dierauf

> The MC of the wood in the piano is what 
>we're trying to control indirectly. For instance, a temperature of 
>70°F, with a 42%RH results in an 8%MC in an arbitrary piece of wood 
>(piano) stored in those conditions. Keeping the RH% at  42 when the 
temperature drops to 50°F results in only a 8.2%MC in the piano, 
>where maintaining 70°F temperature and driving the humidity down to 
>fairly mild 35%RH results in a 6.2%MC and a pitch raise. Each degree 
>F change at a given RH% results in a bit over 0.01%MC change. Each 
>1% change of RH at a stable temperature results in approximately 
>0.15%MC change. So, given the choice, I'd not spend too much time 
>worrying about temperature control, and try to get control of the 
>relative humidity.
>
>Ron N