Emergency? Call 911.
Our emergency rooms are open 24/7, holidays included.
Health Library
Published September 17, 2026 · 6 min read
If somebody is confused, cannot be roused, has collapsed, or has stopped sweating, call 911. A hot house stops being a comfort problem the moment somebody is not making sense.
You do not have to solve the whole problem to be meaningfully safer today. That is the most useful thing on this page, and it comes straight from the CDC:
“Spend some time at a shopping mall or public library — even a few hours spent in air conditioning can help.”
Even a few hours. Not a cool house, not a repaired unit, not a plan for the summer. A few hours, today, somewhere that is already cold and already free.
The CDC’s wording is unusually blunt for a public health page, and it is worth reading twice:
“Don’t rely solely on fans to keep you cool. While electric fans might provide some comfort, when temperatures are really hot, they won’t prevent heat-related illness.”
Comfort and protection are different things, and a fan reliably delivers the first while feeling like the second. Past a certain point a fan is moving hot air across somebody who cannot shed heat into it. The breeze is real. The cooling is not.
The CDC puts a number on where that point is, and it is on our heat exhaustion or heat stroke page rather than this one, because it belongs next to the instructions for cooling somebody who is already unwell.
This is the single most common way a person ends up in genuine trouble inside their own home without ever feeling reckless. They did something. It just was not the thing that works.
A public library. Free, air conditioned, open to anybody, and nobody asks why you are there.
A shopping mall. Same logic, longer hours, and you can sit down without buying anything.
An air-conditioned shelter. CDC’s instruction is to “locate an air-conditioned shelter in your area.”
Your local health department, which CDC names as the place to ask.
And in Arizona, there is a better answer than any of those — the state publishes a heat relief locator at heat.az.gov, listing cooling centres, respite sites and hydration stations. The state maintains it, which is exactly why this page points at it rather than printing a list. A list on our site would be out of date by next summer and nobody would notice. Theirs will not be.
None of this replaces air conditioning, and none of it is free of effort, but it is what people actually have:
Close the house to the sun during the day — blinds and curtains on the sides the sun is hitting, and open things up only when the outside air is genuinely cooler than the inside air.
Cook less, and cook cold. An oven is a heater.
Get water onto skin. A cool shower, a damp cloth on the neck, wrists and ankles. Evaporation works where a fan alone does not.
Move downstairs, or to the coolest room, and sleep there. Heat rises, and a single cool room is more achievable than a cool house.
Put a fan in a window at night to push hot air out, rather than pointing it at a person and calling it cooling.
And if the house is not cooling down at all — if it is still warm in the early morning, or noticeably warmer than it usually is — that is the thing to act on, because a house that never recovers gives a body no time off.
Anybody over 65, and the reasons are specific enough to have their own page.
Infants and young children, who are on the CDC’s higher-risk list on their own account.
Anybody with a chronic condition, or on medication that affects how the body handles heat.
And anybody on a fluid restriction or water pills, because the usual advice to drink more is not automatically right for them, and the number is their prescriber’s to give.
For these people, a few hours in air conditioning is not a nice idea. It is the intervention.
Call 911 for confusion, strange behaviour, unresponsiveness, collapse, seizure, or skin that has gone hot and dry after heavy sweating.
Come to an emergency room for vomiting that will not stop, a headache with nausea in the heat, cramps in an older adult, or anybody who is simply not right in a way you cannot explain. The dividing line between the two conditions is set out in heat exhaustion or heat stroke.
Our emergency rooms are open every hour of every day and are walk-in. Go to the nearest one, and if another emergency department is closer to you, that one is the right answer tonight.
If you are unsure, come in — this list is not exhaustive and you are not expected to judge whether a hot house has become a medical problem.
My air conditioning is broken and I cannot get it fixed for days. Then the plan is a few hours somewhere cold each day, the coolest room at night, water on skin, and checking heat.az.gov for a site near you. And if anybody in the house is over 65, very young, or unwell, treat those hours as the priority rather than the fallback.
Is a swamp cooler the same as air conditioning? Different mechanism, and this page will not rank them for you. What the CDC says is the useful test: if it is not actually keeping you cool when it is really hot, it is not protecting you, whatever it is.
Can I come and sit in your waiting room? That is a question for the front desk rather than for a web page, and we are not going to publish an answer nobody has confirmed. What we can say without qualification is that if you need care, the doors are open every hour.
How do I know if I am getting into trouble rather than just uncomfortable? Cramps, headache, nausea, feeling faint or weak — that is the moment to stop and cool down properly. Confusion is the moment to call 911.
I cannot afford to run the unit. CDC names your local health department as the place to ask, and heat.az.gov lists respite sites. This is a common situation and there is infrastructure for it.
A few hours of air conditioning genuinely helps, and a fan is not a substitute. If somebody is confused or collapsed, call 911. Both of our emergency rooms are open 24 hours a day, every day of the year — walk in, no appointment and no referral. Find your nearest emergency room →
Related reading: heat exhaustion or heat stroke · checking on someone over 65
This article is general information, not a diagnosis. If you are unsure, come in — this list is not exhaustive and you are not expected to assess yourself. If it might be an emergency, treat it as one and call 911.
If it might be an emergency, treat it as one. Both of our emergency rooms are open 24 hours a day, every day of the year — walk in, no appointment and no referral.
Find your nearest emergency room →About your bill, before you worry about it
Ability to pay is not a barrier to assessment and access to care in our emergency rooms — by law. An emergency visit bills at emergency rates, which are not clinic rates, and we would rather tell you that now than have you find out afterwards.
If anything you receive after a visit is unclear, call the facility you were seen at before you pay it. They hold the record of your visit, and they would rather explain a statement than have you pay something you do not owe.