The black wire in the back is the 'outside' thermometer for my Thermo/Hygrometer, and the one in front is the thermostat probe for the UTH. I also keep the ambient heat up during the day with the overhead bulb, and turn it off at night. I never thought about sealing the holes back up with a hot glue gun, which is why they came in from the top. The probes are pretty big at the front, and any hole big enough for them would have been an exit area. I was already worried at first about the wires coming in from the top, but they don't leave big gaps, and I've been playing with the idea of just melting the plastic where they come in from a little so they sit in the frame. And the little gaps they leave now, are held down by the lid, which he isn't strong enough to move...At the moment.

Hot glue gun is an idea though, thanks.