Advertisement Don't yell at me yet! I know heat mats are part of the three big NOs (heat mats, handling, hybrids). I just wanted to get an idea of what you thought for how I use mine. I have a medium critter keeper in which I have my slings in hot wheels display cases. Everyone gets rotated at least once daily and I'm constantly monitoring the temp on the inside of the keeper. This way I can also boost the metabolisms of my slower growers. Is this an acceptable use for a heat pad or nah?