Do crested geckos need a heat lamp?

Why this species is the exception

Every other animal on this site is heated toward a target. A bearded dragon basks at 108-113 F (42-45 C) surface temperature; a ball python wants a warm hide at Warm hide 86-90 F (30-32 C); a leopard gecko needs a warm surface at 94-97 F (34-36 C) surface; warm hide 90-92 F (32-33 C). In each case you are adding heat to reach a figure.

A crested gecko is a crepuscular, arboreal, new caledonian forest gecko from a cool, humid forest, and its published range is 82-85 F (28-29 C) at the top of the enclosure at the top with 70-75 F (21-24 C) at the bottom at the bottom per the care reference. That top figure is not a target to chase - it is close to a limit. Sustained exposure above about 85 F is dangerous for this species, and heat stress in a crested gecko is both easy to cause and hard to reverse.

So the question in the title has a different shape from the equivalent question for any other species we cover. It is not "how do I reach the figure". It is "am I already inside the range, and if I add a lamp will I leave it from the top?"

Step one: measure the room, not the enclosure

Put a digital thermometer in the room for twenty-four hours and read the high and the low. If the room sits in the high 60s to low 80s Fahrenheit, your enclosure is already in range and the correct purchase is nothing at all. That is the most common outcome, and it is why this page leads with measurement rather than product.

Why a tall enclosure does the work a lamp would

Heat rises, and the published figures for this species are stated as a top reading and a bottom reading rather than a hot spot and a cool spot. A 18 x 18 x 36 in for juveniles and adults over 12 g enclosure therefore builds its own vertical gradient out of ordinary room air: the top is a little warmer, the floor is a little cooler, and the gecko picks a height.

That is the whole thermal design, and it is why enclosure shape matters more than wattage for this animal. Crested gecko enclosure size covers the footprint, and 18x18x24 vs 18x18x36 compares the two heights on exactly this point.

If the room genuinely is too cold

Some rooms do run below the range - an unheated spare room in winter, a basement, a house kept cool at night. In that case you are adding a small amount of ambient heat, and three rules apply.

Lightless, and ambient rather than spot. You are lifting the whole enclosure a few degrees, not creating a basking site this species will not use. A low ceramic emitter mounted above and outside the enclosure, or a low-wattage radiant source, does that. A bright spot lamp pointed at a branch is the wrong shape of heat.

On a dimming thermostat, with the probe at the top. The probe goes where the ceiling figure applies - the top of the enclosure - because that is the reading that must not exceed the limit. A thermostat holding the bottom of the enclosure at a comfortable number will happily cook the top.

Never a heat mat on the side or under a planted terrarium. A mat against glass creates a hot patch an arboreal gecko has no reason to expect and cannot easily detect, and under a drainage layer it mostly heats water. This is a species that climbs; its heat should come from above or not at all.

What overheating looks like, and why it is the real risk

A crested gecko in an enclosure that is too warm stops eating, becomes lethargic and spends its time on the floor or pressed against the coolest glass it can find - the opposite of normal behavior for an arboreal animal that should be up in the canopy at night. Because those signs read as "unwell" rather than "hot", the instinct is often to add more heat, which is the loop this page exists to break.

Heat also attacks humidity, which is the other half of this species' requirement. The published range is 60-80%, allowed to dry back to 40-50% between mistings as stated - a cycle, with a dry-back between mistings. A heat lamp running all day flattens that cycle into permanently dry air, and then the shedding problems start. Crested gecko temperature and humidity covers the interaction, and how to increase humidity in a reptile enclosure covers the fix if you have already dried it out.

Heat is not UVB, and the UVB answer is different

Autocomplete pairs this question with UVB constantly - "do crested geckos need a heat lamp and uvb", "...or uvb" - so it is worth separating them. They are different lamps answering different questions, and for this species the UVB answer is more often yes than the heat answer.

A crested gecko sits in zone 1 with a published target of UVI 1.0-2.0 at the basking branch per the Ferguson zone guidance- a low figure that a small low-output tube reaches at a sensible height. Critically, a linear UVB tube adds effectively no basking heat, so providing UVB does not push you toward the ceiling. Do crested geckos need UVB answers it properly and best UVB for crested geckos covers the lamp.

The short answer, restated

Measure the room. If it sits in the published range, buy nothing - this species is kept successfully at room temperature in most homes, and that is not a corner being cut. If the room is genuinely cold, add a small lightless ambient source on a dimming thermostat with the probe at the top of the enclosure, and keep the top under the limit. Then spend the money you did not spend on a lamp on vertical space and planting instead, which is what this animal actually uses.

The setup in full is in the crested gecko setup checklist, and for the species where the heating answer is the opposite of this one, see leopard gecko heating.