My snake room usually stays warm enough due to the RHP in each of the cages...in fact, it’s the warmest room in the house. Prior to the type of setup I have now, I used one of the radiator style space heates. They are oil filled and the one I had came with a tip-over safety feature that shut it off if the unit got knocked over. They are also safe around pets and kids because they don’t get too hot to touch.