Winter power outage: how to keep the terrarium warm?
During a winter power outage, a well-insulated terrarium holds out 2 to 6 hours before dropping below the critical thresholds of most species. The emergency plan boils down to three moves: retain the heat (blankets), produce some without electricity (hand warmers, hot-water bottles) and, if the outage drags on, move the animal to a transport box next to a heat source.
How long can a reptile withstand the cold?
A slow drop towards 15 to 18 °C simply slows the metabolism of most common species: a few hours like that are not dramatic. The danger starts below a sustained 12 to 15 °C: digestion stops (with the risk of a meal rotting mid-digestion in a snake), immunity weakens, then hypothermia sets in. Juveniles and tropical species decline faster.
What should you do the moment the power cuts?
- Stop opening the terrarium unnecessarily: every opening loses degrees;
- Cover the enclosure with blankets or a throw, leaving some ventilation;
- Activate chemical hand warmers (1 to 3 € each) wrapped in a tea towel, never in direct contact with the animal;
- Slip a hot-water bottle (gas hob or thermos reserve) against one wall;
- Group the enclosures in the smallest, best-insulated room of the house.
What emergency kit should you prepare in advance?
For 30 to 60 €: a dozen single-use hand warmers, a hot-water bottle, a battery thermometer, an emergency blanket (foil side towards the enclosure) and an insulated transport box. This kit also serves for extended absences and unplanned trips. The best-equipped add a UPS or a portable power station (100 to 300 €) able to run a 15 W heat mat for several hours.
What if the outage lasts more than 12 hours?
Place the animal in its transport box with a wrapped hand warmer and head for somewhere with power: family, friends, the vet. A reptile travels well kept warm in a car. Once the power returns, bring the temperature back up gradually and wait for 24 to 48 hours of stable parameters before feeding. All the useful gear is listed in the reptile travel and safety section.
Frequently asked questions
Should you feed a reptile that has been in the cold?
No: wait until normal temperatures have held for 24 to 48 hours. In a snake that was digesting during the outage, watch for possible regurgitation.
Is an emergency blanket enough on its own?
It limits radiant losses but produces nothing: always combine it with a passive heat source such as hand warmers or the hot-water bottle.
Do outages upset thermostats on restart?
Most resume their setpoint automatically, but some connected models restart misconfigured: test yours after a deliberate power cut, before winter — the same reflex as in a heatwave.
This guide is part of Planète Pets’s Reptiles universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.