They can take temps in the 50's so unless your house is freezing you should not need any heat! Also, no light either as they like it dark to sleep. My chameleon will not close his eyes until I cover his cage as my computer is next to his cage and he sees the light from that. If you are keeping it in a room with activity and other lights will be on in that room, you might want to throw a cover over the cage. Just make sure if your lights are on a timer, that in the morning the cover is removed so you dont start a fire!