剛剛看了一下滿有趣的，查了一下一些廠牌給的建議
Martin: Martin keeps the factory at a constant 45-55 percent
humidity and 72-77 degrees Fahrenheit.
Collings: At Collings, we build and acclimate our guitars in
an environment of 49% relative humidity and a temperature of
75 degrees.
Taylor: The ideal humidity range for an acoustic guitar is
45-55 percent, but 40-60 percent is generally acceptable.
Furch: Humidity can affect the performance and condition of
your instrument. An ideal storage environment for your guitar
would be in the 40%-65% relative humidity range.
Boucher: we recommend you keep and store your guitar at around
40-60% humidity and room temperature (72-77 degrees Fahrenheit,
or 21-23 degrees Celsius).
Lowden: Lowden guitars are built in a carefully controlled
humidity environment that varies between 45% and 55% relative
humidity, providing optimum worldwide
Maton: At Maton, we build all our guitars in a controlled factory
environment of 50%. Well seasoned timbers have an equilibrium
level of moisture of about 8% when relative humidity (RH) is at
50%. relative humidity.
Breedlove: Humidity levels between 45% and 55% are considered
optimum.