So I've had a Dehumidifier in my bow room for 8/9 years set on 40%, In the winter it does not run mostly, In the summer I don't check it as much as I should unless I'm working in there often.
Sometimes I think It messes with my sinuses?The bow room stay's between 65 and 85 degrees all year, It's a insulated room inside a insulated metal building, and I have a window unit A/C in there too.
Sometimes I will go in there and it will be 70%, dump the water and a hour or so back down to 40%.
The past year or so I've been keeping my Osage Staves out side the bow room door in the metal building because I thought they were getting to dry.
I was glad to run across this chart.
There was a topic started on moisture, Hope this page from The Bowyers Bible helps