Keeping Pets Safe in a Heat Emergency When the House Has No Air Conditioning

No published temperature is safe for every pet, and a fan is ventilation, not cooling, because dogs and most other pets cool by panting rather than sweating. In a house with no air conditioning, give your animals a shaded, ventilated room they can leave, keep water available at all times, put a thermometer at the animal’s level, and call your veterinarian or an emergency animal hospital at any sign of heat stress: heavy panting, thick drool, unsteadiness, collapse or abnormal gum or tongue color. If the house is beyond what you can tolerate, leave it for somewhere cooler.

The power is on. The lights work, the refrigerator hums. Nothing has failed except the house itself, which was built where nobody expected it to need air conditioning and is now inside a heat event it was never designed for. There is no unit to lose and nothing to restore.

That differs from the problem most heat-and-pets writing solves. The usual article assumes a home that lost its cooling, so the answer is a battery, a generator or a gear list. Here the grid is fine. What you have is a building that gains heat faster than it sheds it, a fan or two, some windows, and animals who cannot tell you how they are doing.

So this page is about the building, and about what anyone actually publishes for this situation. Almost every usable number was written for a human body. Four agencies publish four different temperatures at which a fan stops helping a person. One federal regulation publishes 85°F, and it is a compliance trigger for licensed kennels. A veterinary college publication says outright that the recommendations owners want do not exist. A page that hid that behind a confident number would be doing you harm.

The rule that outranks everything else on this page

Heat kills people. Ready.gov’s Extreme Heat page opens: “Extreme heat is responsible for the highest number of annual deaths among all weather-related hazards.”

Nothing below is worth risking your own body. If the house is beyond what you can tolerate, every agency cited here says the same thing: go somewhere cooler. EPA’s Extreme Heat and Indoor Air Quality page makes it a planning step: if you do not have air conditioning, plan where to go, such as public cooling centers, malls or libraries, and spend as much time as you can in air-conditioned places during an extreme heat event.

If your pet cannot come with you, that is a real and painful cost, and the cooling-center section below says so plainly. But it is not a reason to stay in a building that is hurting you. A person who collapses at home cannot help any animal.

The signs of heat illness in a person, and when to call 911

These are the signs from two agencies. They are separate lists, they are about people, and neither is about an animal.

CDC publishes a Warning Signs and Symptoms of Heat-Related Illness flyer, dated April 24, 2024:

• Heat stroke. Signs: high body temperature (103°F or higher), hot, red, dry or damp skin, fast strong pulse, headache, dizziness, nausea, confusion, losing consciousness. CDC says to call 911 right away because heat stroke is a medical emergency, move the person to a cooler place, help lower the temperature with cool cloths or a cool bath, and not give the person anything to drink.
• Heat exhaustion. Signs: heavy sweating, cold, pale, clammy skin, fast weak pulse, nausea or vomiting, muscle cramps, tiredness or weakness, dizziness, headache, fainting. CDC says to move to a cool place, loosen clothes, put cool wet cloths on the body or take a cool bath, and sip water. Get medical help right away if you are throwing up, symptoms get worse, or they last longer than 1 hour.
• Heat cramps. Signs: heavy sweating during intense exercise, muscle pain or spasms. Get medical help right away if cramps last longer than 1 hour, you are on a low-sodium diet, or you have heart problems.

Ready.gov’s Extreme Heat page lists similar signs. For heat stroke it lists an extremely high body temperature (above 103 degrees F), red, hot and dry skin with no sweat, a rapid strong pulse, and dizziness, confusion or unconsciousness, and says to call 9-1-1 or take the person to a hospital immediately. For heat exhaustion it says to call your healthcare provider if symptoms get worse or last more than an hour.

The two lists agree on what decides everything else: heat stroke is a 911 call, not wait-and-see. Confusion, red hot dry skin with no sweat, and a rapid pulse end whatever you were doing and start a phone call. Everything after this section is about the animal, so read this one again first.

Four agencies, four fan numbers, none about your pet

The most-searched question for a house with no cooling is whether the fan is doing anything. For people, the answer is messy.

Source	What it publishes about fans	Whose body it is about
CDC, About Heat and Your Health (July 20, 2026)	Use fans only if indoor temperatures are below 90°F; above 90°F a fan can increase body temperature	Human
EPA, Extreme Heat and Indoor Air Quality (September 29, 2025)	Do not use electric fans for cooling when the room is in the mid-90s or higher; do not use an electric fan in a closed room	Human
EPA, Protect Yourself From Smoke and Heat (June 2026)	Do not direct the fan toward yourself when the room is hotter than 90°F, to avoid dehydration	Human; the named risk is dehydration
UK Health Security Agency, Beat the heat (July 21, 2026, England)	Use electric fans if the air temperature is below 35°C, but do not aim the fan directly at your body	Human
World Health Organization, heat and health fact sheet (July 31, 2026)	Use electric fans only below 40°C / 104°F; above it, fans will heat the body	Human
Ready.gov, Extreme Heat (07/16/2026)	Do not rely on a fan as your primary cooling device; fans give a false sense of comfort. No temperature is attached	Human

CDC’s own wording is: “Use fans, but only if indoor temperatures are less than 90°F. In temperatures above 90°F, a fan can increase body temperature.” CDC publishes 90°F, EPA the mid-90s, UKHSA 35°C and WHO 40°C. The spread between lowest and highest is wide enough to cover an entire heat wave.

The exact temperature is contested

The Cochrane systematic review on this question (Gupta and colleagues, 2012) found no eligible studies despite extensive searching, and concluded that “this review does not support or refute the use of electric fans during a heatwave.” It tells readers to consider the state of the evidence and be aware of local policy or guidelines.

More recent work pushes at the number rather than settling it. Bröde and Kampmann (Biology, 2023) found that increasing wind speed lowered physiological heat strain below 35°C and also at higher temperatures when humidity was high, so humidity moves the answer. Their participants were five young, semi-nude, heat-acclimated, moderately exercising men on a treadmill. That is a finding about human skin physics, not a household rule and certainly not one for a household with animals.

So for people: there is a real effect, it depends on humidity as much as temperature, the agencies have not converged, and the systematic review found no trials. Anyone who says the cutoff is settled has not read the sources.

Why the human fan number cannot be borrowed for your dog

This is a mechanism, not a caveat. EPA’s Extreme Heat and Indoor Air Quality page says portable electric fans do not cool air; they move it around and keep a person cool by helping to evaporate sweat.

A dog does not cool itself that way. Purdue Extension’s Temperature Requirements for Dogs (VA-16-W, Center for Animal Welfare Science, October 2016) says “Heat loss through sweating from the feet and nose is minimal”, that above 31°C (87.8°F) heat is no longer lost through the skin, and that as temperatures approach or exceed the dog’s body temperature, “heat loss by evaporation through panting becomes the only available means by which the dog can cool itself.” The next sentence is the one to carry into a closed-up room: increased humidity, dehydration, confinement in closed spaces with poor ventilation, and upper respiratory complications such as being brachycephalic (short-nosed, like a bulldog, pug or boxer) can all impede the effectiveness of panting.

The peer-reviewed literature agrees. A 2022 review, Heat stroke in dogs (Caldas, Barbosa da Silva and Barauna Junior, Veterinarni Medicina), says evaporation through the respiratory tract is the main form of heat loss in dogs. It adds that in brachycephalic breeds this mechanism may be compromised by conformation problems such as nostril stenosis, soft palate thickening, tracheal hypoplasia and excess nasopharyngeal turbinates. It lists lack of acclimatisation, water deprivation, high humidity and poorly ventilated environments among the exogenous causes of heat stroke.

The transfer fails at the first step. The fan helps a human evaporate sweat. The dog’s main evaporative route is respiratory, through an airway that humidity, dehydration, poor ventilation and a short muzzle can each degrade. No source cited here publishes a fan cutoff for an animal.

Multnomah County, Oregon, on a page last reviewed June 10, 2026, states the practical version: “Pets are cooled primarily by panting and the pads of their paws. Fans do little to cool them off.” The county is telling residents not to build the plan on the fan.

That does not make a fan useless. Poor ventilation is on the veterinary list of causes of heat stroke, and moving air out of a room is a real job. It is just not the same job as cooling an animal.

The 85°F figure, and what it binds

Search long enough and you will find 85°F attached to dogs. It is real and federal, and it is not what people who quote it think.

The source is 9 CFR 3.2, Indoor housing facilities, in the Animal Welfare Act standards. Subsection (b) states: “Auxiliary ventilation, such as fans, blowers, or air conditioning must be provided when the ambient temperature is 85 °F (29.5 °C) or higher.” The next sentence, which is rarely quoted, says relative humidity must be maintained at a level that ensures the animals’ health and well-being, in accordance with the directions of the attending veterinarian and generally accepted professional and husbandry practices. The regulation hands the humidity half to a named veterinarian and publishes no humidity number.

Subsection (a) carries a second 85°F, a ceiling: the temperature must not rise above 85°F for more than 4 consecutive hours when dogs or cats are present. Its 50°F cold floor is written “except as approved by the attending veterinarian,” and the paragraph says the requirements are in addition to all other climatic requirements in parts 2 and 3. Even inside the regulation, these numbers are a floor on top of other obligations, not a complete answer.

Now the scope. Part 3 Subpart A is a standard for entities the Animal Welfare Act reaches. Under 9 CFR 2.1(a)(1), no person may operate as a dealer, exhibitor or operator of an auction sale without a valid license, except those exempt. These are the rules a licensed breeder, dealer, exhibitor or registered research facility is inspected against. They are not a code for your living room.

Do not let these two numbers collapse into one

CDC’s 90°F is a physiological statement about a human body: above it, a fan can increase a person’s body temperature. The regulation’s 85°F is a compliance trigger: above it, a licensed facility must run auxiliary ventilation whether or not any animal is in distress. Neither is the temperature at which your dog is in trouble, and Purdue says that temperature has not been established. Putting the numbers on one page makes it look as though animal guidance is converging in the eighties. It is not.

The useful part of the 85°F rule is its shape: at some ambient temperature, a facility is expected to stop relying on the building alone and start moving air deliberately. That is a reasonable prompt to check your own room. It is not a threshold, and it is not permission to stop watching the animal.

The room: what is published, and what is missing

The strategy for a house with no cooling is not to cool the house. It is to stop one part from getting as hot as the rest and to move heat out at the only hour when the outside air will cooperate. Every agency describes some version of that sequence. None describes it for animals.

The published sequence

EPA’s pet fact sheet, Protect Your Pets From Wildfire Smoke (EPA-452/F-26-007, June 2026), is the one federal document that publishes a no-air-conditioning routine on a page about pets. Close blinds and shades before it gets hot. At night, open the windows and use fans to exhaust hot air from rooms or draw in cooler air. Then close the windows and use a portable air cleaner to remove smoke. It also says to keep indoor air clean by avoiding cooking (especially frying or broiling), vacuuming, candles, fireplaces and woodstoves, and smoking or vaping.

EPA’s Extreme Heat and Indoor Air Quality page adds the decision rule: if the air outside is hotter than the air inside, close the windows; if it is cooler, open the shades and windows. It recommends covering windows that get morning and afternoon sun, says outdoor awnings and louvers reduce heat entering a home more than indoor shades, and names bigger projects such as air sealing and insulating the attic.

Ready.gov’s before-the-heat list is parallel (shades, weather-stripping, window reflectors, insulation, an attic fan), and WHO says to use night air after dark when it is cooler outside than inside, and to close windows and cover them with blinds or shutters by day. Most of those are calm-day jobs.

Which room, and the rules that fight each other

Here published guidance runs out. The nearest room-selection rule is EPA’s How to Create a Cleaner Air Room at Home (EPA-452/F-26-005, June 2026), written for wildfire smoke, not heat. It says to pick a room big enough for everyone in your household to be comfortable, with a bedroom with an attached bathroom a good choice, and to close windows and doors without making it hard to leave the room in an emergency. Its third step is to stay cool by running fans, window air conditioners or central air, so it assumes cooling you do not have. UKHSA’s version is seven words: “move to a cooler part of the house, especially for sleeping.”

The veterinary advice points the other way. The AVMA’s warm weather pet safety page says: “Provide different temperature zones within your house for your pet’s comfort.” Purdue says animals need options to cope with heat and cold and to regulate behaviorally, including cooled areas in homes. EPA’s pet fact sheet says cats exposed to heat may show restless behavior, search for a cool spot, pant, drool and have sweaty paws. An animal looking for a cool spot needs one to find.

Three published sentences do not fit together in one room:

1. Consolidate into the coolest part of the house (UKHSA, for people).
2. Give the animal different temperature zones to choose between (AVMA, for pets).
3. “Do not use an electric fan in a closed room.” (EPA, for people.)

One room, door shut, fan running, is out of step with all three. That is not a reason to abandon the idea. Build it deliberately: pick the room that is genuinely coolest in your house, keep a path open so the animal can move to another surface or temperature, do not seal the exit, and put a thermometer in the room rather than trusting how it feels when you walk in from outside.

What no source publishes about the room

None of the federal and veterinary sources cited here publishes any of the following:

• A rule for which room in a house is the correct cool room for animals in a heat event.
• A square-footage-per-animal figure or an animals-per-room limit for a home cool room.
• An air-changes-per-hour figure for a home room holding pets.
• An indoor temperature at which a home becomes dangerous for a dog or a cat.

The last is narrower than it looks. It does not mean no species anywhere has a published figure. Species-specific organizations do publish per-species thresholds; RSPCA Australia’s rabbit figures, below, are one. Check your species’ own veterinary or welfare organization before concluding that nothing exists. Where confident numbers turn up elsewhere, they tend to come from commercial pet blogs and HVAC vendors rather than an agency, veterinary body or peer-reviewed paper, so none is quoted here.

Cool-room math for a multi-pet household

If you have four animals and one usable room, you want a number. There is not one. The closest published statement is Purdue’s warning that enclosure size and the number of enclosures may make the effective ambient temperature near a dog differ from the room’s temperature as a whole, and that substrate composition and color and the number of dogs per enclosure also influence it. Three usable ideas come out of that.

• The temperature near the animal is not the temperature of the room. A wall thermometer at head height measures your air, not the animal’s. A crate in a corner, a bed against an interior wall, a cat under a bed: each is a microclimate. Measure at the animal’s level, in the place it actually chooses.
• The surface matters. Animals in heat lie on the hardest, coolest floor they can find. That is a reason not to fill your cool room with bedding and then wonder why nobody uses it.
• The count matters, in the obvious direction. More animals in a closed room means more metabolic heat and moisture in a space sealed against outside air. Purdue lists humidity and confinement in poorly ventilated spaces among the things that impede panting. A room that was a refuge for one animal can become a humid box for four.

In the absence of a number, take these questions to a veterinarian who knows your household: how many of these animals can share one closed space, which should not share space under stress, and which is most heat-vulnerable and gets the coolest option. The multi-pet emergency planning guide works the household layer. California’s cooling-center guidance also states one constraint waiting at the other end: “A guest may not bring more pets than they are reasonably able to control.”

Not every animal in the house is a dog

Almost everything above was written about dogs, and much of it about people. Extending it sideways is the error this site exists to avoid.

Rabbits. RSPCA Australia’s Knowledgebase entry Can rabbits get heat stress? (updated 1 March 2023) gives an optimal temperature range of 15-25°C and optimal humidity of 55%-60%. It says heat stress can occur above 30°C, and that above 35°C rabbits cannot regulate their body temperature and can develop heatstroke. Converting, that is roughly 59°F to 77°F, about 86°F and about 95°F; the conversions are ours, the figures are theirs. The entry adds: “Rabbits do not display symptoms of illness unless they are in real trouble.” RSPCA Australia is a welfare organization writing for Australian conditions, so treat these as that body’s figures, not a domestic standard. It treats fans differently from the human guidance: with little natural breeze, a small battery-operated fan can provide some ventilation to the enclosure, positioned so the rabbit can move away from the breeze. Ventilation with an escape route matches the AVMA’s temperature zones. See rabbit and small pet emergency prep.

Birds are a gap, and we are not filling it. EPA’s pet fact sheet addresses birds only for smoke: they are particularly susceptible, and should be kept inside in a cleaner air room when smoke is present. No primary avian-veterinary source cited here publishes a heat threshold for pet birds, so no bird temperature appears on this page. A bird’s respiratory anatomy is not a mammal’s, which is why borrowing dog figures would be worse than saying nothing. Ask an avian veterinarian, and see bird and parrot emergency preparedness.

Cats. EPA’s pet fact sheet gives one federal sentence, about behavior: restlessness, seeking a cool spot, panting, drooling and sweaty paws. A cat panting at all is worth a call to your veterinarian.

Fish, reptiles and amphibians. Their enclosure is the environment, not the room. See the aquarium and reptile power outage page.

Flat-faced dogs and cats. EPA says short-nosed dogs such as pugs and bulldogs can have trouble breathing in smoke or heat and need extra caution. Purdue describes brachycephalic dogs as four of the ten most popular registered breeds in America (AKC) and says they cannot effectively disperse heat by panting, resulting in heat and exercise intolerance. The cooling gear guide for brachycephalic dogs covers the risk profile. The same impaired panting can appear later through an acquired condition; the heat planning guide for laryngeal paralysis and tracheal collapse covers that.

The garage, the utility room and the bathroom

One federal document names specific rooms for pets. EPA’s Protect Your Pets From Wildfire Smoke says to keep pets indoors as much as you can with doors and windows closed if you can stay cool, to keep outdoor bathroom breaks short, and to bring outdoor pets into a less smoky, cooler environment like a utility room, garage or bathroom, moving pesticides and other dangerous products out of reach. Three points:

• The conditional matters: doors and windows closed only “if you can stay cool.” EPA already accounts for a house that cannot stay cool sealed.
• The room list is a smoke instruction. It names places less smoky and cooler than outdoors. It is not a finding that a garage is a good place for an animal in a heat emergency, and no source cited here establishes that.
• The pesticide sentence comes attached because these are the rooms where household chemicals live.

A garage adds a hazard the others lack. EPA’s carbon monoxide page lists exhaust from attached garages among household sources of CO and says: “Do not idle the car inside garage.”

The Consumer Product Safety Commission’s What to Know About Generators and Carbon Monoxide (CPSC468, dated 0322) says using a generator indoors can kill you in minutes because its exhaust contains carbon monoxide, a poison you cannot see or smell. Its front panel closes the workaround a hot, closed-up house invites: “NEVER use inside a home or garage, EVEN IF doors and windows are open.” It says to use a generator only outside and far from windows, doors and vents, and not to operate one in a home, garage, basement, crawlspace, shed or porch or leave a car running in an attached garage. Opening the garage door does not make it outdoors.

Because this page has named a combustion source in an enclosed space, it carries CPSC’s alarm instruction: “DO install battery-operated CO alarms or CO alarms with battery backup outside sleeping areas, and on each floor of your home. Test alarms monthly.” Mounting height is a question for the alarm manufacturer’s instructions; this page does not publish one. CPSC lists the symptoms of CO poisoning as headache, dizziness, weakness, nausea, vomiting, sleepiness and confusion, and says that if CO poisoning is suspected, get outside immediately, then call 911. It says never to ignore a CO alarm that sounds.

Two conclusions. A bathroom or utility room on the shaded side of the house has the fewest complications. And a running vehicle is never a cooling strategy for an animal, in a garage or anywhere else. Leaving a pet in a running air-conditioned car looks like an answer and is not one; the heat wave and hot cars page explains why, and leaving a pet in the car at an evacuation stop covers the case where a trip forces it.

When heat and smoke arrive together

In much of the country the no-air-conditioning heat event and the wildfire smoke event fall in the same week, and the instructions point opposite ways: open windows at night to dump heat, keep windows shut to keep smoke out. EPA’s Protect Yourself From Smoke and Heat (EPA-452/F-26-009, June 2026) resolves it in favor of the heat: you must cool down your home and may need to allow smoke inside while using night air for cooling. Both are harmful, but “for most people, heat is more immediately dangerous.” That is a statement about human health, not your dog.

For animals, EPA’s pet fact sheet gives the sequence above. It says evidence in humans indicates smoke and heat together are much worse than smoke alone, and that this is likely true for pets, and it declines to assert it as flatly for animals as for people. It names older, younger or pregnant animals and those with heart or lung disease as especially at risk, to be closely watched, and tells owners to consult their veterinarian on managing pets during a smoke event or a combined smoke and heat event and to make an evacuation plan.

EPA also warns that sometimes the coolest part of the day is the smokiest, so the hour you counted on for flushing the house may be when smoke settles. Check the AirNow Fire and Smoke Map before opening anything: EPA says to consider outdoor air quality before opening windows. If you cannot tolerate smoke and cannot stay cool, EPA says to go somewhere to cool off during the smoke event. The smoke half is in the wildfire smoke and pet safety guide, and the days-indoors problem is in the indoor enrichment guide for smoke days.

When the answer is to leave the building

At some point the house stops being the plan. EPA’s cleaner-air room fact sheet names the trigger under the heading In Some Cases, It May Be Best to Seek Shelter Elsewhere: if you cannot stay cool at home, the power goes out, or too much smoke gets in, consider staying with friends or family or going to a public shelter or another location with air conditioning. The pet does not appear in that sentence. That is a pattern across the federal material.

The routes the agencies name

• CDC says to use air conditioning or find a location that has one by dialing 2-1-1, visiting the National Center for Healthy Housing’s Cooling Centers by State page, or contacting your local health department or emergency management agency.
• Ready.gov says to identify places in your community where you can get cool, such as libraries and shopping malls, or to contact your local health department for cooling options.
• EPA’s heat and smoke fact sheet adds 2-1-1 and a distinction: check with your state, Tribal or local government about cleaner air and cooling centers. A cleaner air center and a cooling center are not automatically the same facility, and in a combined event you may need one that is both.

The pet question is a separate call, and the answer is local

Whether a cooling center admits animals is set locally, and published county positions differ.

• Multnomah County, Oregon (page last reviewed June 10, 2026): “Pets are welcome at Multnomah County cooling centers when locations are activated, but there is limited kennel space available.” Residents are told to check the county site for when dedicated centers are open, so even a favorable policy depends on activation.
• California Department of Public Health, in Cooling Centers Guidance to local health departments (July 18, 2023), writes its pet section as a conditional: centers that allow pets are encouraged to follow its guidelines. It says owners should seek immediate veterinary care if a pet shows signs of heat stroke: abnormal breathing, weakness, pale or sticky gums, collapse, vomiting or diarrhea.

The California guidance is the most useful published description of what a pet-admitting cooling center looks like, and it tells you what to bring. Owners provide food, food and water dishes, and waste supplies including litter, a litter box and poop bags. Dogs must be on a leash (retractable leashes are not recommended) or in crates or carriers. Cats should be in a suitable crate, or at minimum secured with a harness and leash. Other animals such as rabbits and birds must be in a suitable crate. Owners must keep possession of their animals at all times, and staff should be aware that an animal’s vaccination status may be unknown. These are recommendations to counties, not promises to you; a specific center’s rules are that center’s.

Service animals sit outside this. The California guidance states: “Service animals are not considered pets and must be allowed entry into cooling centers.” A pet policy does not govern a service animal.

What this costs, said plainly

If your local cooling centers do not admit animals, the choice during a serious heat event is hard. You may have to leave animals in a house you have prepared as well as you can while you go somewhere your own body can survive. No source cited here grants a stay-with-your-pet exception to official heat guidance. What makes it survivable is doing the work before the week arrives: knowing which nearby facilities admit animals, having a friend or relative with cooling who has already agreed, having boarding identified, and having the crates and carriers those facilities require. The board or evacuate together decision guide covers the boarding branch, and when your county has no pet-friendly shelter builds the private-destination ladder.

Recognizing trouble, and where this page stops

This page is about the building. Once an animal is in trouble, the correct action is veterinary. The AVMA’s warm weather pet safety page lists signs of heat stress: anxiousness, excessive panting, restlessness, excessive drooling, unsteadiness, abnormal gum and tongue color, and collapse. Its instruction is to seek emergency veterinary care if you see any of them. EPA’s pet fact sheet lists overlapping signs for smoke and heat together, including trouble breathing (open-mouth breathing, more noise, rapid breathing), excessive panting, fatigue or weakness, disorientation, uneven gait or stumbling, and reduced appetite or thirst, and opens by saying to consult your veterinarian if any animal shows them. RSPCA Australia’s warning for rabbits applies to every prey species: they do not show symptoms until they are in real trouble.

No cooling protocol appears on this page: no water temperature, duration, number of repetitions or stopping temperature. Those decisions belong to a veterinarian and to the pet heatstroke emergency response guide. If an animal is collapsing or struggling to breathe, stop reading and call.

What to ask, and whom to ask

Question this page cannot answer	Who answers it	What to ask
Whether what I am feeling is heat exhaustion or heat stroke	911 for heat stroke; your healthcare provider if heat exhaustion is not improving	Confusion, red hot dry skin with no sweat, or a rapid pulse with a temperature near or above 103°F mean heat stroke: call 911 now
What indoor temperature is unsafe for my specific animal	Your veterinarian	Age, breed, coat, weight, heart or airway disease, and what that adds up to for this animal in this house
Whether my multi-pet household can share one closed room	Your veterinarian	How many animals in one space, which pairs to separate under stress, which animal gets the coolest option first
Any cooling protocol, including whether and how to wet an animal	Your veterinarian	What to do before you arrive, and when to stop
Whether my nearest cooling center admits animals	2-1-1, the National Center for Healthy Housing’s Cooling Centers by State page, your local health department, your county emergency management agency	Which sites open and, separately, which admit pets and under what restraint rules
Whether a bird, reptile or exotic can tolerate this room	An avian or exotics veterinarian	The species-specific range, since dog and human guidance does not transfer
Whether my house can be improved before next summer	A licensed contractor and your utility’s efficiency program	Attic insulation, air sealing, outdoor shading and window treatments, using EPA’s and Ready.gov’s lists as the agenda
Whether a CO alarm is placed correctly	The alarm manufacturer’s instructions and your local fire department	Placement and testing schedule

The version you do on a cool afternoon

Nearly every effective item in the sourced guidance is a spring project. Acclimatization is slow too: Purdue reports that partial acclimatization in small animals can take 10 to 20 days and full acclimatization 60 (citing Johnson et al., 2006). A heat wave arrives in two days. An animal’s adaptation does not.

• Pick the room now and measure it. Put a thermometer at the animal’s level, on the surface it uses, and watch it in the hottest part of a merely warm day. That reading, not the room’s reputation, is the input.
• Handle the windows that face morning and afternoon sun, preferring outdoor awnings and louvers to indoor shades where you can.
• Test the night flush on an ordinary evening. Learn how many hours your house takes to give up its heat and which window pairing moves air.
• Decide the fan’s job in advance: moving hot air out of the room, not blowing on an animal, set so the animal can leave the airflow.
• Make the calls. 2-1-1, the National Center for Healthy Housing page, your local health department, your county emergency management agency. Ask which sites open in a heat emergency and which admit animals. Write the answers with your veterinarian’s and emergency animal hospital’s numbers.
• Ask your veterinarian the two questions this page cannot answer, at a routine visit.
• Check CO alarms if the house has an attached garage or any combustion appliance, and test them monthly.

Your no-air-conditioning heat checklist

• Identify the coolest room in your house by measurement, at the animal’s level, not by assumption.
• Confirm that room has an exit the animal can use and a second temperature option to move to, since AVMA advises different temperature zones, not one sealed room.
• Cover windows that get morning and afternoon sun before the heat arrives; EPA says outdoor awnings and louvers reduce heat entering a home more than indoor shades.
• Learn your night-flush routine on an ordinary evening: which windows, which fan positions, how many hours.
• Check outdoor air quality on the AirNow Fire and Smoke Map before opening windows, and read EPA’s smoke-and-heat guidance if both are present.
• Treat every fan as ventilation, not cooling. Position it so the animal can leave the airflow, and never treat a running fan as evidence an animal is fine.
• Keep water available at all times.
• Write down your veterinarian’s number, your nearest emergency animal hospital’s number and the after-hours option, somewhere that does not require a charged phone.
• Know your 911 trigger before the week starts: CDC and Ready.gov both list confusion, red, hot or dry skin with no sweat, and a rapid pulse as heat stroke, and both say to call 911 immediately.
• Call 2-1-1, check the Cooling Centers by State page, and call your local health department and county emergency management agency. Record separately which sites open and which admit animals.
• Have crates or carriers ready. Published guidance for pet-admitting cooling centers requires dogs leashed or crated and cats crated or harnessed, with food, dishes and waste supplies brought by the owner.
• Identify a cooled destination that takes your animals: a friend or relative with air conditioning who has agreed, a boarding facility, or a pet-friendly hotel outside the heat.
• If your house has an attached garage or a combustion appliance, install and test CO alarms monthly per CPSC, and never run a generator or engine in a home or garage, even with the door open.
• Ask your veterinarian in advance what indoor temperature and what signs should change your plan for each animal.
• Decide now what you will do if the house becomes unsafe for you and the cooling center will not take your animals.

Where to go next

This page is the building half of the heat problem, part of the pet emergency playbooks hub.

• An animal is in trouble right now: the pet heatstroke emergency response guide.
• The power fails on top of the heat: dog cooling gear that works during a power outage, cooling vest versus cooling mat and sheltering in place through power outages.
• The risk is the vehicle: pet heat wave safety and hot cars and leaving a pet in the car at an evacuation stop.
• The household is the constraint: multi-pet emergency planning, rabbit and small pet emergency prep, bird and parrot emergency preparedness, and the state pet shelter policy finder.

Then make two calls this week, while it is still merely warm. Ask your county whether its cooling sites admit animals, and ask your veterinarian what number and what signs should change your plan for your specific animal.