Right now the Relative Humidity here in my room is around 70%. What I am doing is putting some silica gel in the sound hole in a small mesh bag and leaving it like that in the case especially at night when the heat drops. The hygrometer reads about 50% inside the body of the guitar. I should think that any moisture will invade through the sound hole as the instrument is finished with lacquer except for the inside of the body, and this lacquer will tend to act as a barrier against moisture. So I will carry on like this for a while and see how things go. I do not think our local climate is too bad for instruments generally but it is definitely worth while keeping an eye on things. I was interested in those who said that their guitars sound best at say around 45%RH. My 714ce sounds so fine and I really want to preserve this!!!