How do you guys go about doing this? We set up our rack system recently and because it was warm, I didn't notice how badly they hold ambient temps. They have about a 7-inch long, 4-inch wide hot spot in a big adult sized drawer, the hot spot is at 90 always (herpstat pro) but when I use a tempgun anywhere other than the hot spot at night, it hangs around the 70's. The snakes tend not to sit on their hot spots either. This is gonna get way worse in the winter. What should I do?