Doug, Not as bad as it sounds. Heat stick used to help keep air circulating and help keep the safe at a stable temp. Although I have a feeling that you already know why I use it. Actually, heat stick is at the very bottom of the safe and not near any coins. I did not use one at first and started to see spoting on some of my coins. After I put it in, I didn't see as many spots popping up on the coins. Don't know if the two are related, but I have been using one since and have not had any problems. Started to use one EVA dry dehumidifier a few years ago and just bought the second one a few weeks ago. I am in the process of finding a good hygrometer to monitor the humidity. Should have done all this a long time ago, but I didn't find CT until last year.
Again Joe, you don't want air circulating inside your safe. You want it as sealed up as it can be so that the dehumidifier can its job most effeciently.
So the fan inside the safe is not a good idea? Just joking! Point taken. Will unplug heat stick when I get home.