Captive leopard geckos require a gentle, gradual temperature gradient in their enclosures. This means their enclosure should have a cooler side and a warmer side. The cool side of the enclosure should be between 75F and 80F, while the warmer side should be between 80F and 85F. They should also have a small, hot basking area of around 90F to 95F.
Heat elements like basking bulbs and ceramic heat emitters are often used to keep temperatures within a safe range for captive leopard geckos.
Humidity should be kept fairly low, or between 30% and 40% at most since leopard geckos are native to very hot and dry desert-like environments. Thermometers and hygrometers designed especially for reptile enclosures are commonly used to monitor temperature and humidity levels.