How to Stay Cool Without Air Conditioning

An estimated 35 million Americans have no home air conditioning, and heat is the deadliest weather hazard in the United States — more than hurricanes, tornadoes, or floods combined. If your home doesn't have AC, or if the grid is straining and you're worried about an outage, these are the steps that actually work.

Humid vs dry heat: this changes what works

Not all cooling tricks apply to every climate. In dry heat (Phoenix, Denver, Las Vegas, most of the interior West), a damp sheet in a window, a mister, or a bowl of ice in front of a fan measurably lowers indoor temperature — the water evaporates and takes heat with it. In humid heat (Houston, Miami, the East Coast, the Midwest during dew-point spikes), those same tricks add moisture to already-saturated air and can make the room feel worse. Fans still help in humidity because moving air still helps sweat evaporate off your skin — but skip the swamp cooler.

The National Weather Service's HeatRisk map shows current heat danger levels; the CDC's Extreme Heat page has the authoritative guidance this article summarizes.

Manage the sun, the windows, and the air

• Close blinds and curtains during the day, especially on south- and west-facing windows. Blackout curtains or a reflective panel (even a foil-lined blanket taped up) block more heat than thin drapes.
• Open windows only when it's cooler outside than inside — usually early morning and late evening. Close them before the outdoor temperature rises above your indoor temperature.
• Run ceiling fans counterclockwise so they push cool air down. In two-story homes, an upstairs fan pulling air out and a downstairs fan pulling cooler air in creates a chimney effect.
• Put box fans in windows at night — one blowing cooler outdoor air in, another blowing warm indoor air out on the opposite side of the house.
• Turn off heat-producing electronics. Desktop computers, incandescent bulbs, and hot lamps add real heat to a small room.
• Avoid using the oven or stove. Grill outside, cook in the microwave, or eat cold meals — sandwiches, cold soups, salads. A single oven cycle can raise a small apartment 5–10°F.

Cool your body, not just the room

• Take cool (not cold) showers. One of the fastest safe ways to drop your core body temperature.
• Put wet cloths on your wrists, neck, and ankles. The blood vessels are close to the skin at these pulse points, so cooling them cools your whole body.
• Drink a cup of water each hour — don't wait until you feel thirsty. Skip alcohol and sugary drinks; they worsen dehydration.
• Wear loose, light-colored, breathable clothing. Cotton and linen let sweat evaporate; synthetic athletic wear traps heat.
• Use the coolest room. Basements and ground-floor rooms are usually 5–15°F cooler than upper floors. If you have one, sleep there during the worst nights.

Grid strain and outages: have a backup plan

Heat waves stress the electric grid right when you need cooling most. Rolling outages and storm-triggered blackouts are more common during heat events.

• Know where a nearby cooling center is before you need it. Dial 2-1-1 (free, 24/7) or check your city's official heat page.
• Charge phones and medical devices before an expected outage.
• Keep refrigerated medications in an insulated cooler if the power goes out; don't place them directly on ice.
• Never run a generator indoors or in a garage — carbon monoxide poisoning is deadly.

Public libraries: the single most reliable free option

Every public library in the US is free, air-conditioned, open to the public with no ID or purchase, and typically ADA accessible with WiFi, water fountains, and restrooms. During heat waves they extend hours in many cities. If you're wondering where to go and 2-1-1 has a wait, your nearest library is almost always a safe answer.

For an active cooling center opened for the current heat event, call 2-1-1 — it's free, 24/7, and covers about 99% of US communities. See our cooling-centers directory for city-specific guidance.

When to seek medical help

If you or someone you're caring for shows signs of heat stroke — body temperature 103°F or higher, hot/red/dry skin, rapid pulse, confusion, or loss of consciousness — call 911 immediately. Do not wait to see if it passes. See our page on heat-stroke and heat-exhaustion warning signs for the full picture.