Jackery, EcoFlow, Aquarium Co-Op, Penn-Plax, and Pangea Reptile are trademarks of their respective owners; EmergencyPetPrep is not affiliated with or endorsed by any of them.
A power outage is a different hazard than a storm or a fire, and it calls for a different playbook: in most cases, you shelter in place rather than evacuate. But “shelter in place” isn’t the same instruction here as it is for an airborne hazard. Ready.gov’s general shelter guidance says to close vents and turn off the HVAC; a power outage may take the HVAC away from you anyway, and if your pet is heat- or cold-sensitive, the actual job is managing without climate control, not sealing the house against it. This page is the hub for that job: what genuinely depends on grid power for an animal’s welfare, what to do about each dependency, and the generator and carbon monoxide risks that make this hazard more dangerous than it looks.
We sell nothing here. Every claim below traces to a named source (FEMA, Ready.gov, the CDC, the CPSC, the ASPCA, AVMA, or a manufacturer’s own spec sheet), and where a claim is thinner than we’d like, we say so instead of rounding it up to sound more authoritative.
Act Now: The Two Risks That Can’t Wait
Two things about a power outage are dangerous enough that they need to be handled before anything else on this page.
Carbon monoxide. Generators, camp stoves, and grills run outdoors only: a minimum of 20 feet from windows, doors, and attached garages, exhaust facing away from the home, per FEMA’s generator safety guidance. Never run one in a garage, a home, or any enclosed space, even with doors and windows open.
The CPSC estimates about 100 consumer deaths a year in the U.S. from carbon monoxide linked to portable generators. Pets are vulnerable to the same gas: the ASPCA lists depression, vomiting, weakness, coma, seizures, difficulty breathing, and cardiac arrhythmias as CO poisoning symptoms in animals, and specifically flags birds as especially vulnerable because of their respiratory systems.
If you suspect CO exposure in a pet, get them to fresh air and call an emergency vet immediately. The ASPCA notes recovery can require monitoring for delayed neurological effects for 3 to 6 or more days.
Heatstroke. If the outage takes your air conditioning with it and your pet starts excessive panting, drooling, showing unsteadiness or collapse, an abnormal gum color, or unusual anxiousness, that’s an emergency-vet-now situation, not a wait-and-see one. Cornell’s veterinary college describes heatstroke as a medical emergency that can cause severe organ damage and death without access to shade, water, and rest.
Overweight pets and short-nosed (brachycephalic) breeds carry meaningfully higher risk. A peer-reviewed review found brachycephalic dogs had roughly 1.3 times the odds of exertional heat-related illness and roughly 2.4 times the odds of environmental heat-related illness compared with non-brachycephalic dogs, though the same research found no significant difference in mortality once a dog was affected.
Cats show heat stress more subtly than dogs: hiding, restlessness, drooling, panting, warm ears, and seeking out cool surfaces like tile or a sink are early signs worth acting on, not waiting out.
If either of these applies right now, stop reading and act. Everything below is about preparing so you’re not making these calls for the first time mid-outage.
Shelter in Place or Evacuate? Reading the Situation Correctly
A power outage by itself is a shelter-in-place situation. Ready.gov’s power-outage guidance is built around managing without electricity at home, not leaving. That changes the moment the outage is a symptom of something bigger (a wildfire that knocked out lines, a hurricane, a gas leak), in which case you follow whatever evacuation order applies to the underlying hazard, not the outage itself.
Two of Ready.gov’s own instructions can pull in different directions depending on which scenario you’re actually in. Its general shelter-from-hazard guidance says to bring pets inside, close doors, windows, air vents, and fireplace dampers, and turn off fans, AC, and forced-air heating: sound advice if you’re sealing the house against smoke or an airborne contaminant. A plain power outage is the opposite problem: the AC and forced-air heat are already off because the power’s gone, and a sealed house with no climate control is exactly the setup that raises heatstroke risk for an at-risk pet. Read the actual hazard you’re facing before defaulting to a generic checklist step.
Vet-wins note: if your pet has a heart or respiratory condition, is a senior, or is a brachycephalic breed, talk to your veterinarian ahead of time about how much heat or cold that specific animal can safely tolerate without climate control. This page can flag general risk factors; your vet knows the individual animal.
What Actually Depends on Power: Four Real Dependencies
Most of what people worry about during an outage doesn’t actually need backup power. Four things genuinely do, and each has a different fix:
| Dependency |
What fails without power |
What it needs |
| Aquarium |
Pump stops oxygenating/circulating water; heater stops maintaining temperature |
Battery-backup air pump (oxygenation); insulation and monitoring (temperature) |
| Reptile enclosure |
Heat source shuts off |
Insulation, hourly temperature checks, purpose-built heat pack if needed |
| Refrigerated medication |
Fridge temperature rises after about 4 hours (door closed) |
Vet or manufacturer call, not a guessed timeline |
| Well pump (electric) |
Pump stops; water pressure and safety degrade |
Stored water in advance, or a generator/backup power tied to the pump |
Sources: Aquarium Co-Op power-outage guide; Petco reptile power-outage guide; CDC food-safety guidance; PrivateWellClass.org well-pump knowledgebase.
HVAC-dependent pets belong on this list too, but the fix there is behavioral and monitoring-based (moving the pet to the coolest/warmest room, watching for the warning signs above) rather than a single piece of gear, so it’s covered in the heatstroke section above rather than the table.
Aquariums: Oxygen First, Temperature Second
The more time-sensitive problem in most tanks is oxygenation, not temperature. A battery-backup air pump keeps water circulating and oxygenated while the power’s out. Two documented options at different runtime tiers:
- Aquarium Co-Op’s battery-backup air pump auto-switches to its internal lithium-ion battery the moment power drops, running 20 hours in continuous mode or up to 40 hours in power-save mode (15-second on/off cycling), per the manufacturer’s own product page.
- Penn-Plax’s Air Pod runs on 4 D-cell batteries and is rated, per a retailer spec page, for up to 150 hours of continuous operation on tanks up to 55 gallons. That’s the longer runtime of the two, though that specific figure comes from a retailer rather than Penn-Plax’s own site.
Temperature is the second half of the problem, and it’s less urgent in most households: rooms don’t lose heat as fast as a tank loses oxygen circulation. Tropical species are more heat-sensitive to a temperature drop than hardier species. If you keep a heated tropical tank through a multi-day outage, that’s a case for the portable-power-station route below rather than a battery air pump alone, since a heater draws far more power than an air pump does.
Reptiles: Insulate First, Add Heat Carefully
Most reptiles tolerate a few hours of cooler-than-normal temperatures without harm, according to Petco’s reptile-care guidance. This isn’t an immediate crisis the way a fish tank losing oxygen can be. Tropical species are more heat-sensitive than desert species. The steps that matter:
- Insulate the enclosure with blankets or towels to slow heat loss.
- Check the temperature by thermometer every hour rather than guessing by feel.
- Watch for cold-stress signs: lethargy, refusal to move, or a pale appearance.
If the outage runs long enough that supplemental heat is genuinely needed, use a purpose-built reptile heat pack, not an open flame and not a generic human hand warmer. This distinction matters more than it sounds: a dedicated 40-hour reptile/shipping heat pack (like Pangea Reptile’s) peaks around 110°F at the surface, while a common human hand warmer can reach up to 140°F, hotter than what’s designed for direct animal-adjacent contact. Whichever type you use, it should never touch the enclosure glass directly; buffer it with a towel or insulation, per exotic-vet guidance.
Refrigerated Medication: Call, Don’t Guess
If your pet takes a medication that needs refrigeration (insulin is the most common example), the safe move when the power goes out is to call your veterinarian or the medication’s manufacturer, not to apply a general timeline. Temperature tolerance varies by drug and formulation, and no single pet-specific authority publishes one universal number for how long a given medication stays safe once refrigeration stops.
What is documented, as a general proxy rather than a medication-specific rule: a refrigerator holds safe temperature for about 4 hours with the door closed, per the CDC’s food-safety guidance, and a full freezer holds 48 hours (24 hours if half-full). Keep the door closed as much as possible to preserve that window, and use the call to your vet or the manufacturer to find out what it actually means for your pet’s specific prescription. This page isn’t the place to give you a number to act on instead of that call.
Well Water: The Fix Is Storage, Not Improvisation
An electric well pump stops the instant the power does. A pressure tank retains a small amount of usable water through a low faucet, but once system pressure drops and faucets get opened, the water is more exposed to contamination. This isn’t a source to lean on mid-outage. The fix is stored water ahead of time: keep enough drinking water on hand for every person and pet in the household, refreshed on a regular schedule, so you’re not depending on a pump that just lost power. If your household relies on a well long-term, a generator or solar backup tied specifically to the pump is the documented fix for extended outages.
Backup Power, Sized to the Actual Job
Backup power isn’t one purchase. It’s matching the tool to the dependency. A CO alarm and a phone charger need almost nothing. An aquarium heater or a mini fridge needs real wattage. Sizing it wrong means either paying for capacity you don’t need or running out of power exactly when it matters.
| Product |
Capacity |
Continuous output |
Best for |
| Jackery Explorer 300 Plus |
288Wh |
300W |
CO alarm, phone charging, small aquarium air pump |
| Jackery Explorer 1000 v2 |
1070Wh |
1500W |
Mini fridge + aquarium heater + one medical-class device |
| EcoFlow DELTA 2 |
1024Wh |
1800W |
Similar to the Jackery 1000 v2, with slightly more output headroom |
Sources: Jackery and EcoFlow product listings, cited per-product in the spec tables below.
None of these replace a generator for whole-home or extended multi-day power needs. They’re sized for keeping specific animal-dependent devices running. If your actual need is whole-home backup, that’s a licensed-electrician conversation about a transfer switch and a properly sized generator, not a portable power station.
A generator, if you use one, is never a shortcut around the carbon monoxide rule above. Outdoors only, 20 feet minimum from windows, doors, and attached garages, exhaust facing away. The rule doesn’t relax because the outage is long or the weather is bad.