Leopard gecko heating in cold homes

Getting heating and UV lighting right is genuinely the single most important thing you can do for a reptile — the majority of common health problems, from metabolic bone disease to respiratory infections, trace back to incorrect temperature or lighting rather than diet or anything else. An enclosure hitting 12°C overnight is a serious and urgent problem for a leopard gecko; that's cold enough to suppress their immune system, halt digestion, and cause potentially fatal stress within days. Can you tell me a bit more — how old is your gecko, what size is the enclosure, and what heating or lighting do you currently have in place at all?

Right, that makes complete sense — a lot of people get away with ambient room temperature in warmer homes and it works until it doesn't. For a 3ft wooden viv in a cold rural house, you need reliable, controlled under-tank heat that stays consistent through the night regardless of how cold the room gets. Leopard geckos are crepuscular and get their heat from belly contact with warm substrate rather than basking under a lamp, so a heat mat is exactly the right tool here. The critical thing though is that it must run through a thermostat — an uncontrolled mat can overheat and cause burns or a fire risk. What I'd recommend is the Habistat Mat Stat Thermostat paired with a Habistat Heat Mat sized for your vivarium floor.

Yes, a real reason. Cheap unbranded thermostats frequently fail in the 'on' position, which means your heat mat runs at full power indefinitely — surface temperatures can exceed 50°C, which burns your gecko through the substrate and is also a fire hazard in a wooden enclosure. Habistat is the established reptile-specialist brand in the UK and their Mat Stat has a solid track record for reliability. It's not expensive — around £25-30 on Amazon — and it genuinely is the component you do not want to cut corners on. The heat mat itself should cover roughly one third of the vivarium floor so your gecko has a warm side and a cool side and can thermoregulate properly.

Set the thermostat probe under the substrate on the warm side and aim for a surface temperature of 28–30°C on the warm side, with the cool side sitting at ambient room temperature — whatever that is, even 15°C is fine on the cool end. For lighting, leopard geckos were long thought not to need UV, but current evidence and guidance from the British and Irish Association of Zookeepers recommends low-level UV — a 2% or 5% T5 UVB tube on a 10-12 hour day cycle. It's not as critical as the heating in your immediate situation, but a Arcadia ShadeDweller kit is worth adding once the temperature crisis is sorted. Fix the heating first — that's urgent. UV can follow in the next week or two.

Good — that's absolutely the right call and the most important thing you can do for her right now. When it arrives, place the mat under one end of the viv, run the thermostat probe between the mat and the vivarium base, and give it 24 hours to stabilise before you put her back in. Once she's warm and settled, come back and we can sort the UV lighting properly. She should be absolutely fine once temperatures are stable.