Leopard Gecko Temperature & Heating Guide [2026]

Leopard Gecko Temperature Requirements

Leopard geckos are ectotherms — they rely on external heat to regulate body temperature, digest food, and maintain immune function. A proper temperature gradient is critical for health.

Ideal Temperature Gradient

The gecko moves between warm and cool zones throughout the day to thermoregulate. Without a proper gradient, the gecko cannot control its body temperature.

Heating Options

Under-Tank Heater (UTH / Heat Mat)

Under-tank heaters have been the traditional choice for leopard geckos.

Pros:

• Provides belly heat for digestion
• Inexpensive and widely available
• Silent operation
• No light emission — does not disturb day/night cycle

Cons:

• Heats only the floor, not ambient air
• Can overheat without a thermostat — burns are a serious risk
• Cannot be used with thick substrate
• Does not provide the infrared radiation that overhead heat does

Setup tips:

• Attach to the outside bottom of the tank on the warm side (covering about 1/3 of the floor)
• Always connect to a thermostat — set probe on the floor surface inside the tank
• Place the temperature probe between the UTH and the substrate surface

Deep Heat Projector (DHP)

Deep heat projectors emit infrared-B and infrared-C heat without visible light. They are becoming the preferred option among experienced keepers.

Pros:

• Produces deep, penetrating heat similar to the sun
• Heats the floor and objects, creating a natural basking zone
• No visible light — suitable for 24-hour use
• Pairs well with a dimming thermostat for precise control

Cons:

• More expensive than heat mats
• Requires a dome fixture
• Must be connected to a dimming thermostat

Halogen Flood Bulb

Halogen bulbs produce heat across the full infrared spectrum, closely mimicking natural sunlight.

Pros:

• Most natural heat source — produces infrared-A, B, and C
• Heats from above, creating a natural basking zone
• Encourages natural basking behavior
• Inexpensive to replace

Cons:

• Produces light — only suitable for daytime use (needs a separate nighttime heat source if room drops below 65°F)
• Requires a dimming thermostat
• Must be positioned to achieve correct floor temperature

Ceramic Heat Emitter (CHE)

Pros:

• No visible light — good for nighttime supplemental heat
• Long-lasting

Cons:

• Dries out the air significantly
• Only produces infrared-C (the least beneficial form)
• Not ideal as a primary heat source

Thermostat: Non-Negotiable

Every heat source must be connected to a thermostat. This is the most important piece of equipment in your setup.

Without a thermostat:

• Heat mats can reach 120°F+ and cause severe thermal burns
• Heat lamps can overheat the enclosure
• Temperatures fluctuate wildly with room temperature changes

Thermometer Placement

Accurate temperature readings require proper thermometer placement.

Recommended Setup

• Digital thermometer with probe on the warm side floor surface (measures the actual surface the gecko sits on)
• Second thermometer on the cool side
• Infrared temperature gun for spot-checking surface temperatures

Where to Measure

What to Avoid

• Stick-on dial thermometers — inaccurate, often off by 5-10°F, and measure air temp instead of surface temp
• Measuring only air temp — floor temperature is what matters for digestion
• Single thermometer — you need readings from both the warm and cool side

Nighttime Temperature

Leopard geckos experience natural nighttime temperature drops in the wild (Afghanistan, Pakistan, India). A drop at night is beneficial.

• If room temperature stays above 65°F (18°C), turn off daytime heat sources at night — no supplemental heat needed
• If room drops below 65°F, use a lightless heat source (CHE or DHP) to maintain a minimum of 65-70°F
• Never use red or blue "night" bulbs — these disrupt the gecko's circadian rhythm and provide poor-quality heat

Common Temperature Mistakes

1. No thermostat — the most dangerous mistake; causes burns and overheating
2. Only using a heat mat with thick substrate — the heat cannot reach the surface effectively
3. Stick-on thermometers as the only measurement — inaccurate and unreliable
4. Colored night bulbs — disrupt sleep and are unnecessary
5. No cool side — the gecko cannot escape the heat and becomes stressed
6. Heating the entire enclosure — eliminates the temperature gradient

Conclusion

Proper heating is one of the most important aspects of leopard gecko husbandry. Provide a warm side floor temperature of 88-92°F and a cool side of 75-80°F, always controlled by a thermostat. Deep heat projectors and halogen flood bulbs offer the most natural heat, though under-tank heaters work when used correctly. Use digital thermometers with probes to verify surface temperatures, and allow a natural nighttime drop to 65-70°F. Getting temperatures right supports proper digestion, immune function, and a long healthy life.