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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWinterizing a reptile means protecting the temperature inside its enclosure, not the temperature of the room. A cold room can lower the basking spot and the cool end without any obvious sign, so the work starts with measuring. Add controlled supplemental heat only where your readings call for it, match the lighting to your species, and treat brumation as a veterinary decision rather than something the calendar decides.
Start with your species, because the targets differ
Reptiles depend on outside heat, but the temperatures that suit one species can be wrong for another. The two UC Davis School of Veterinary Medicine care pages cited here give very different examples, which is why the first step is confirming exactly what you keep.
| Setting | Bearded dragon (UC Davis bearded dragon care) | Desert tortoise (UC Davis desert tortoise care) |
|---|---|---|
| Daytime enclosure temperature | 80–85°F | 70–90°F |
| Basking spot | 88–95°F | About 95°F |
| Nighttime temperature | 70–75°F | Drops to 70–75°F |
| Daylight in the lighting schedule | About 14 hours light, 10 hours dark | 12–14 hours in warmer months, 10 hours in winter |
| UVB replacement | Every 3–6 months | Interval set in the guidance; follow it and the bulb maker’s labeling |
These numbers apply only to the species named in each guide. They are not general reptile settings, and a value such as a basking spot of 95°F should never be applied to a species that the guidance does not cover.
Measure the enclosure, not the room
A room thermostat tells you very little about the animal’s actual environment. Use at least two thermometers, as UC Davis recommends, and check them in this order:
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- Place one thermometer at the basking spot, where the animal’s warmest reading will come from.
- Place a second thermometer at the cool end, at the height where the animal normally rests.
- Record both readings in the morning, afternoon, and night for several days. Repeat the log after any change in outdoor or room temperature, since those shifts are what alter the enclosure.
- Compare each reading with the range for your species, not with a range from a different reptile.
Digital thermometers make this practical. A thermostat controls heat, but it does not determine the right temperature for the animal on its own.
Add supplemental heat only where the readings require it
If the basking or cool-zone readings drop below your species’ range, add heat. UC Davis describes an under-tank heater or a ceramic heat emitter as options for bearded dragons when room temperature falls below 70°F at night. That is a bearded dragon example, not a universal winter threshold.
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- Control every under-tank heater. UC Davis recommends a thermostat or rheostat for under-tank heating in both the bearded dragon and desert tortoise guidance. Confirm that the controller is rated for the heater you are using before you install it.
- Keep the gradient intact. The animal should be able to move between warmer and cooler areas. Heat that fills the whole enclosure removes that choice.
- Manage burn risk. UC Davis warns that heating elements can cause burns and can be dangerous if misused. Arrange heat sources so the animal cannot touch hot surfaces, and follow the setup guidance for your species.
- Install a smoke alarm. UC Davis recommends one because of the heating-element hazard.
The cited guidance covers monitoring and controlled heat. It does not give heater wattage, so choose equipment based on the thermostat and the readings you are logging.
Keep lighting species-specific
Do not switch every enclosure to one winter photoperiod. The bearded dragon and desert tortoise schedules in the table above differ, and UC Davis treats indoor UVB timing and bulb replacement as species-specific. Write down the date each UVB bulb went in, set the timer to your species’ schedule, and replace the bulb on the interval in the guidance and the manufacturer’s labeling.
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Brumation: a veterinary decision, not a seasonal default
Brumation is a colder-season dormancy. In its November 18, 2021 article on turtle brumation, Texas A&M University’s College of Veterinary Medicine & Biomedical Sciences describes it in some turtles and tortoises and notes that some indoor pets may never experience it, because their environments do not change in the same way. Cold weather outside is therefore not, by itself, a reason to start.
Who should make the decision
The Texas A&M article says brumation should be started only by an experienced caretaker or veterinarian. Ashley Navarrette, a clinical assistant professor at the college, puts it directly: “Please consult with your exotic veterinarian prior to this process.” The article notes that some exotic veterinarians offer brumation services.
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Animals the article says should not brumate
- Sick or injured turtles and tortoises.
- Animals under four years old.
These are the article’s turtle and tortoise recommendations. It does not extend them to other reptiles.
The figures in the Texas A&M article
The article describes a body-weight loss of 6–7% during brumation, which it characterizes as generally accepted at about 1% per month, and brumation periods of 10 to 14 weeks. These figures come from that article about turtles and tortoises. They are not a guaranteed safe range or a target for other species. The article also describes routine soaking, weigh-ins, and close environmental monitoring, and it flags temperature extremes and predators as risks for outdoor brumation.
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Read appetite and activity changes carefully
A slower appetite in winter does not automatically mean the animal should be cooled or deprived of heat. The University of Illinois College of Veterinary Medicine, in its December 15, 2022 post on ambassador animals, describes a captive box turtle and skink that do not brumate but whose metabolism often slows in winter, reducing appetite. The wildlife medical team there monitors weight, behavior, and food intake and adjusts diets to seasonal needs. That is one institutional example, not a rule that every captive reptile should eat less.
Keep a simple weekly record of weight, behavior, and food intake. If the animal’s weight, activity, or eating changes in a way that concerns you, contact a reptile veterinarian rather than adjusting heat or food on your own.
Winter preparation checklist
- Two thermometers in place, one at the basking spot and one at the cool end
- Readings logged at several times of day and compared with your species’ range
- Every under-tank heater on a thermostat or rheostat that suits it
- Heat sources arranged so the animal can move away from them
- Smoke alarm installed in the room
- UVB schedule and bulb replacement date confirmed for your species
- Weight and food intake recorded on a regular schedule
What the cited guidance does not cover
The UC Davis care pages do not include a power-outage plan, and they do not set a universal temperature, wattage, or humidity target. The Texas A&M and University of Illinois articles date from 2021 and 2022, so check current veterinary guidance before you rely on any figure. For outages, emergency heating, or any species not named above, ask an exotic veterinarian for species-specific instructions.
Source for turtle and tortoise brumation: Texas A&M University College of Veterinary Medicine & Biomedical Sciences, “Turtle Brumation: The Benefits & Dangers Of The Hibernation Cycle”. Source for winter appetite changes: University of Illinois College of Veterinary Medicine, “Winter and Ambassador Animals”.
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