Reptiles are ectotherms — they rely entirely on their environment to regulate body temperature. Without a proper thermostat, your heat source can overheat and burn your pet or drop too low, stressing their immune system and digestion. Disclaimer: This article contains affiliate links. We may make a small commission from any purchase made through these links at no additional cost to you. A good reptile thermostat isn't optional — it's essential for safety and success in herpe