In short:
The installation of a thermostat for Leopard Gecko requires precise positioning of the thermal probes in order to maintain the temperature gradient essential for the digestion of the reptile.
- Hot zone: Aim for a surface temperature of 31°C to 33°C at the hot spot according to Geckonest data (2026).
- Cold zone: Maintain an ambient air temperature between 24°C and 27°C during the day.
- Critical threshold: Immediately switch off the heater if the surface reaches the critical overheating threshold of 35°C.
- Carpet placement: Place the probe on the ground on the surface of the substrate, directly under the hot hiding place.
- Lamp placement: Suspend the probe in the air at 5 to 10 cm under the bulb with dimmer (Dimming).
Why temperature control is vital for the leopard gecko
The Leopard Gecko (Eublepharis macularius) is a poikilotherm reptile. His body does not produce internal heat and depends entirely on external thermal sources to regulate his metabolism, digestion and immune system.
Without a reliable thermostat, the animal is exposed to serious clinical disorders. Thermal underexposure leads to stopping digestive transit, lethargy and rapid weight loss. Conversely, prolonged exposure beyond the critical hot spot overheating threshold of 35°C causes acute heat stress, selective dehydration and potentially fatal skin burns.
In terms of budget, initial material investment (terrarium, lighting, regulation) represents the main expenditure item before the purchase of feeder insects and specialized veterinary consultations with a NAC practitioner. A quality thermostat prevents expensive medical emergencies.
How to choose and size your heating equipment
The choice of thermostat directly depends on the selected heating mode. There are two main types of thermostats: the on/off model (suitable for radiant elements without light) and the model with progressive or gradual variation (dimming), mandatory for heating bulbs emitting visible light.
The gold rule for the sizing of the heating zone is based on the surface of the terrarium: the heating element (heating mat or infrared/ceramic lamp) must cover a proportion of 33% (i.e. a third) of the total length of the Terrarium, exclusively on one side only. This creates a sharp horizontal thermal gradient between the hot side and the cold side.
In parallel with the thermal adjustment, the hygrometry monitoring is fundamental. The recommendation for ambient relative humidity in the terrarium is between 30% and 40% according to the RSPCA (2026). Nevertheless, a specific area called wet hiding place must have a relative humidity level of between 70% and 80% to guarantee an unretained molt on the fingers and tail.
Step-by-step guide: installation and adjustment of the thermostat
Step 1: Install the heating equipment on a third of the terrarium
Position your heating mat under the bin (or inside under a protective plate according to the manufacturer’s standards) or attach your lamp dome to one side of the terrarium. Scrupulously respect the proportion of 33% of the total length of the tank to leave the remaining two thirds in the cool zone.
Step 2: Place the thermostat sensor accurately
The positioning of the probe differs according to the heating technology used:
- For a heating mat: The thermostat probe should be placed on the ground, on the exact surface of the substrate, directly under the hot hiding place in the hot zone (Geckos Unlimited, 2018).
- For a heating lamp (with dimming thermostat): The probe should be suspended in the air about 5 to 10 cm directly under the heating bulb, above the thermal bathing stone (R/LeopardgeckosAdvanced, 2021).
Step 3: Install independent control thermometers
Never rely solely on the thermostat display. Install two separate digital ambient thermometers: Place the probes at a placement height of 2.5 cm (1 inch) above the substrate on the hot side and on the cold side to measure real ambient air at the reptile level.
Step 4: Set up daytime and night thermal ranges
Set your thermostat to reach a surface temperature in the hot zone (hot spot) between 31°C and 33°C during the day (Geckonest, 2026). The ambient air temperature in the cold zone should stabilize between 24°C and 27°C.
At night, turn off the light heating. If the room ambient temperature drops, the thermostat should maintain a minimum tolerated nighttime ambient temperature of 18°C, with the recommended range ranging from 18°C to 24°C (Reptifiles, 2025).
Step 5: Check the thermal stability before the reptile is introduced
Rotate the installation empty for 24 to 48 hours. Use an infrared thermometer (thermal gun) to control the hot spot surface temperature and confirm that no critical threshold is exceeded of 35°C.
Summary of Probe Settings and Locations
| Area or equipment | Probe/sensor location | Target value / recommended range | Reference source |
|---|---|---|---|
| Thermostat probe (heating mat) | Placed on the ground on the substrate, under the hot hiding place | 31°C to 33°C (ground surface) | Geckos Unlimited (2018) / Geckonest (2026) |
| Gradual thermostat probe (Lamp) | suspended in the air, 5 to 10 cm under the bulb | 31°C to 33°C (Thermal Bathing Stone) | Reddit R/LeopardGeckosAdvanced (2021) |
| Hot room thermometer | 2.5cm above substrate (warm side) | 24°C to 27°C (ambient air) | Herpetology Guide (2026) |
| Cold mood thermometer | 2.5cm above substrate (cold side) | 24°C to 27°C (day) / 18°C to 24°C (night) | Herpetology Guide (2026) / Repfiles (2025) |
| Wet hiding place (HUMID HIDE) | Inside the intermediate/cool refuge | 70% to 80% relative humidity | Reptiles (2025) |
Clinical signs to monitor in case of incorrect adjustment
A daily observation of the behavior of the leopard gecko makes it possible to identify a malfunction of the thermostat before the appearance of physical sequelae:
- Hot zone too cold (< 30°C): Presence of reurgitation of non-diegaged insects, liquid or dark stools, constant lethargy in hot zones without nocturnal activity.
- Overheating (> 35°C): The gecko remains exclusively camouflaged in the cold zone, clings to the walls in height, keeps the mouth half-open for panting or presents redness under the legs.
- Air too dry (< 30% RH) or too humid (> 50% RH in ambient zone): Moulting problems retained on the fingers (risk of necrosis) or respiratory infections (raking noises during breathing).
frequently asked questions
What temperature should be set on the thermostat at night?
At night, the ambient temperature may drop. The minimum tolerated night ambient temperature is 18°C. The recommended range is between 18°C and 24°C. If your accommodation remains heated above 19°C, night heating is generally not necessary.
Where exactly to place the thermostat sensor with a heating mat?
The thermostat probe should be placed on the ground on the substrate surface, directly under the hot hiding place in the hot area of the terrarium. This guarantees an exact measurement of the heat transmitted by contact to the belly of the gecko.
What is the maximum temperature to never exceed in the terrarium?
The critical overheating threshold not to be exceeded at the hot spot is 35°C. Beyond this surface value, the leopard gecko risks skin burns, acute thermal shock and severe dehydration.
{“@context”:”https://schema.org”,”@graph”:[{“@type”:”Article”,”headline”:”Comment installer un thermostat pour gecko léopard en 5 étapes”,”description”:”Découvrez comment régler et placer la sonde de thermostat dans un terrarium de gecko léopard pour garantir un gradient thermique parfait et sécurisé.”,”datePublished”:”2026-11-02″,”dateModified”:”2026-11-02″,”inLanguage”:”fr”,”keywords”:”thermostat, terrarium, gecko, leopard, installation, howto”},{“@type”:”FAQPage”,”mainEntity”:[{“@type”:”Question”,”name”:”Quelle température faut-il régler sur le thermostat la nuit ?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”La nuit, la température ambiante peut descendre. La température ambiante nocturne minimale tolérée est de 18 °C. La plage recommandée se situe entre 18 °C et 24 °C. Si votre logement reste chauffé au-dessus de 19 °C, le chauffage nocturne n’est généralement pas nécessaire.”}},{“@type”:”Question”,”name”:”Où placer exactement la sonde du thermostat avec un tapis chauffant ?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”La sonde du thermostat doit être posée au sol à la surface du substrat, directement sous la cachette chaude située dans la zone chaude du terrarium. Cela garantit une mesure exacte de la chaleur transmise par contact au ventre du gecko.”}},{“@type”:”Question”,”name”:”Quelle est la température maximale à ne jamais dépasser dans le terrarium ?”,”acceptedAnswer”:{“@type”:”Answer”,”text”:”Le seuil critique de surchauffe à ne pas dépasser au point chaud est de 35 °C. Au-delà de cette valeur de surface, le gecko léopard risque des brûlures cutanées, un choc thermique aigu et une déshydratation sévère.”}}]}]}