Rack heating for 4 leopard geckos

Reptile welfare is almost entirely determined by getting the environment right — temperature gradient, UV lighting, humidity, and substrate all need to match the specific species' natural habitat, and getting this wrong causes chronic stress and illness over time. You're here about reptile setup, so let me help you get it dialled in properly. What species are you keeping, how old are they, and what specifically are you setting up or looking to improve?

That's a very sensible move — running four separate mats and thermostats is exactly the kind of setup that leads to missed temperature checks and inconsistent hot spots. Before I point you to a specific product, a couple of quick questions: what size tubs are you using on the rack, and are you open to a proportional thermostat setup or do you want on/off thermostats for each zone? Proportional gives far more stable belly heat for leos, which matters a lot for digestion.

Good — proportional is the right call for leopard geckos, full stop. For a four-tub rack on 28-litre RUBs, I'd recommend the Habistat Mat Stat combined with Habistat heat mats sized to cover roughly one third of the tub base. But if you want a single cleaner solution that handles all four simultaneously, look at the Microclimate Evo Multi — it's a four-channel proportional thermostat unit that lets you set independent temperatures per channel, so your adults and juveniles can run at slightly different hot spot temps from one controller. Your adults want a belly heat zone of around 30–32°C; juveniles can sit at the same range but you'll want to check it more frequently as they're more sensitive to fluctuation. One Microclimate Evo Multi, four appropriately sized heat mats wired in, and your rack becomes one tidy system.

It works with any resistive heat mat — it's not brand-locked. The one thing to check is total wattage load per channel; each channel on the Evo Multi handles up to 600W, which is far more than any single leo heat mat will draw, so you're fine. I'd pair it with Habistat or Microclimate's own mats because the build quality is consistent and the wattage ratings are accurate, which matters when you're setting proportional outputs. Avoid unbranded mats from unknown sellers — the stated wattage is often wrong, which throws off the thermostat's proportional calculation and gives you unstable temps.

Tape the probe to the underside of the tub directly over the heat mat, centred in the warm zone. Don't put it inside the tub on top of the substrate — that gives you ambient air temp, not surface temp, and you'll end up overdriving the mat to compensate. With the probe underneath, you're measuring the actual contact surface your gecko uses for thermoregulation. Once set, verify the surface temp inside the tub with a temperature gun a few times over the first week to confirm the probe reading corresponds to real surface conditions — there can be a small offset depending on tub material thickness.