I just finished misting the GH. it is 70ยบ with just 40% humidity. It is always lower in the warmest part of the afternoon in the winter. In the summer it is the opposite, with the humidity dropping at night. I would love to keep it constant while plants are inside for the winter. That is something I will be working on this year. How? I haven't figured that out yet anything short of misters on timers.