Leopard Gecko Heating Guide: Equipment & Safety
| Warm hide floor (surface) | 88–92°F (31–33°C) |
| Basking spot (if overhead heat used) | Up to ~95°F (35°C) |
| Thermostat | Mandatory with any heat source |
| Heat rocks | Never safe — do not use |
Equipment options
An under-tank heater (UTH) under one end of the enclosure is the traditional core setup and delivers belly heat, which leopard geckos rely on for digestion. Overhead heat — a low-wattage halogen bulb or a deep heat projector — is increasingly used alongside or instead of a UTH, since it delivers infrared warmth more like natural basking and supports more visible daytime activity.
The thermostat is not optional
Any heat source must run through a thermostat with its probe positioned at the warm hide floor. An unregulated UTH or heat lamp can climb well past safe temperatures and cause thermal burns — this is one of the most common preventable husbandry failures in leopard gecko keeping.
Heat rocks are never safe
Heat rocks heat unevenly and their internal thermostats are unreliable, so the surface a gecko rests on can be far hotter than the device reports. They have caused serious burns and deaths in captive reptiles and there is no configuration that makes them acceptable.
Signs the heating setup is wrong
A gecko that won't leave the warm hide, refuses food, or looks lethargic may be too cold. One that spends time on the enclosure glass, is restless, or avoids the warm side entirely may be too hot. Verify with a digital thermometer probe rather than guessing.
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A single adult leopard gecko needs a 20-gallon long tank as an absolute minimum, with a 36x18 in (40-gallon breeder) footprint now considered the recommended standard — plus a secure lid, an under-tank heater on a thermostat, a thermal gradient, at least three hides, and a shallow water dish.
Set up in this order: substrate, then heat source wired through a thermostat, then hides and water dish, then decor — and run the whole enclosure for at least 24–48 hours to confirm stable temperatures before your gecko moves in.
Hatchlings can start in a 10-gallon tank or tub, juveniles do well in 20 gallons, and adults need a 20-gallon long as an absolute minimum — with 36x18 in (40-gallon breeder) now the widely recommended standard, not just an upgrade.
Leopard geckos can survive without UVB using dietary D3 supplementation, but current husbandry guidance now recommends low-level UVB (roughly 2–6% T5) as best practice — it improves D3 synthesis, bone density, and natural behavior, and views on it have shifted significantly from older nocturnal-species advice.
Keep ambient humidity around 30–40% across most of the enclosure, with a dedicated humid hide raised to roughly 70–80% to support smooth, complete sheds.
Leopard geckos typically live 15–20 years in captivity with proper care, with some individuals reaching 25 years or more — the oldest verified captive leopard gecko lived to roughly 28.5 years. Wild geckos live far shorter lives, usually 6–8 years.