Well I'm new at the incubator game and for the first few nights I was up and down every few hours checking on the temp and humidity.... felt like I had a new baby again... and I guess I do, but I hope that it's LOTS of new babies with 41 eggs in there!
I've got my bator in the best spot I think I can find other than a closet!
I've found that if I put a towel underneath the bator and one over the top window of my 1588, I can keep the temp more stable. If I walk by and the temp reads 100.1, then I remove a part of the towel over a corner of the "window" and allow a little of the warmth to escape there. It will then usually go right back to 99.5 or 99.7. If I walk by and it's gone down to 99.3, I make certain that it's fully covered. I add "warm" water if the humidity goes below 40. Sometimes I add a little too much, if I do I open the bator for a few seconds if I notice that the humidity gets up near 49% and that will usually run it down to 44 or 45 and then it goes down slowly until it goes to below 40 and I'm careful not to add quite as much the next time.
Just giving my experience so far.