I haven't been able to get mine over 68 yet. Seems to change with the temp. in the house. I live in Washington state, and it's starting to get a bit cold. During the day while I'm at work, I turn the heat down and the humidity goes down to about 65 or 66. Get the heat going in the evening, and it gets back to 68. i have a 50-75 sized humidor, with about 40 smoke in it and one of those round credos. Maybe I should try a larger one.