The most important heating and lighting instruction for a crested gecko is a warning against helpfulness. Unlike desert reptiles, this New Caledonian gecko lives comfortably at the temperatures of an ordinary home and can be seriously stressed by well-meant extra heat. Your carer's job is mostly to keep the room stable, keep nights dark, and mist in the evening — and to know the one temperature problem that really does need action.
Give the safe room range and the danger line
Write down his comfort zone plainly: low to mid 70s Fahrenheit suits him for the whole stay, with ordinary day-to-night variation. Then underline the ceiling — sustained heat in the mid 80s is dangerous for a crested gecko, and a carer should treat a heatwave, a broken air-conditioner, or an enclosure left in sun through a window as an urgent problem. The practical instruction is to move the enclosure to the coolest shaded room, keep it away from radiators and sunny glass, and contact you at once rather than opening the enclosure repeatedly to check on him, which adds handling stress to heat stress. A room thermometer near the enclosure makes this judgement objective instead of guesswork.
Say clearly that no heat lamp is wanted
Spell it out in the first line of your notes, because a carer used to bearded dragons or snakes may assume every reptile needs a basking bulb and fit one as a kindness. For your gecko there is no basking spot, no hot end, and no heat mat to switch on. If your home has a gentle background heating system keeping the room in range, show the carer its normal setting and ask them not to adjust it upward for the gecko's sake. The same applies to well-meaning moves like placing the enclosure on top of a warm appliance or beside a lamp — stability, not warmth, is the goal for this species.
Keep lighting to a simple day and night rhythm
Crested geckos do not need a dedicated UVB setup in the way a dragon does, though a low-level light some keepers provide is optional rather than essential; what your carer must protect is the rhythm. Ordinary room daylight by day and real darkness at night lets him wake, feed, and explore on schedule. Ask the carer not to leave a bright room light or an enclosure light running into the night 'to watch him,' and to do evening checks with brief, dim light instead. If your enclosure has a small plant or day light on a timer, label its plug and times so it is neither left on around the clock nor unplugged and forgotten.
Tie misting to the evening routine
His humidity care is part of the same evening visit as feeding: a light misting of the foliage and walls raises humidity overnight and leaves droplets for him to drink, then the enclosure should be allowed to dry out somewhat during the day rather than staying permanently soggy. Tell the carer to use the spray bottle you leave, filled as you fill it, and to mist the leaves rather than spraying the gecko directly. If the carer reports he is pressed flat and pale at the top of the enclosure on a warm evening, that is worth a message to you the same night, not a note for your return.
Finish with the short list of real alarms
Keep genuine warnings few and specific so they stand out: a gecko who is limp, lying on the floor of the enclosure in daytime, breathing with his mouth open in a hot room, or found after the enclosure has clearly overheated needs prompt contact with you and your reptile vet. Ordinary daytime sleeping curled on a leaf, colour changes between pale and dark, and an untouched food pot on a single night do not. KinsLe's Care Pass keeps this short do-and-do-not list in one clear handoff so a well-meaning carer adds nothing your gecko does not need.