Nah.. below 68 is still alright.. If it goes to around 55 degrees i will turn a heater on but ya dont want it to go over 75 degrees in the room.. Read up alil and see, low temps are good for the chameleons immune system but continued exposure to extremely low temps will harm your animal. If your chameleon is very dark at night or before bed it is too cold. I live in the high desert and the temperatures drop alot here at night to about 38-45 degrees my chameleons do fine inside with temps around 62-70.