To cool a room without central air, first block direct sun and cut indoor heat from cooking. Open windows only when outdoor air is cooler, clean enough, and safe to let in. Fans can make you feel cooler but do not lower room temperature; the CDC advises using indoor fans only below 90°F. Evaporative coolers are an option mainly in dry climates, where added humidity is less of a problem.
Start with free ways to keep heat out
Block direct sunlight
Close available shades or window coverings where sunlight is shining into the room. Limiting solar heat gain can reduce the room’s cooling needs, though the guidance cited here does not establish a universal temperature reduction for shades or reflective coverings. The U.S. Department of Energy recommends shading as part of home cooling, and Washington State Department of Health guidance includes pulling window shades.
Make less heat indoors
Use the stove and oven less during hot periods; cooking indoors adds heat to the room. The CDC recommends reducing stove and oven use for people without air conditioning. See the CDC’s advice for staying cool without AC.
Ventilate only when conditions favor it
Opening windows can help when outdoor air is cooler than the room and safe to admit. It can make conditions worse if outside air is hotter or polluted, or if opening a window creates a fall or other health risk. The Department of Energy notes that ventilation is not an effective cooling strategy in hot, humid climates. Its home-cooling guidance explains the limits; the CDC also advises against opening windows or doors when doing so risks falls or triggers health problems.
#1 Best Overall
- 3-in-1 Portable Air Conditioner: Enjoy cool air (64°F- 90°F) during hot summer days, plus dehumidifier and fan modes for comfortable air circulation when temperatures are milder. Everything you need for year-round comfort in one AC unit
- Comfort Sleep Mode: Sleep mode and programmable 1-24 hour timer maintain your ideal room temperature automatically. Ultra-quiet operation below 50dB won't interrupt sleep, while two adjustable fan speeds let you customize airflow
- Quick Window Installation: Comes ready to install with exhaust hose and adjustable window kit that fits widths from 20.48 to 49 inches. No handyman skills required—set up completely in just minutes and start cooling immediately（for small windows, trimming may be necessary)
- No-hassle Maintenance: Advanced Self-evaporating operation effectively reduces the frequency of manual water draining. The washable filter captures dust effectively and slides out easily for quick cleaning whenever needed—keeping air fresher longer
- Room-to-Room Versatility: Lightweight with smooth-rolling casters, this compact AC moves effortlessly wherever cooling is needed. Perfect for bedrooms, living rooms, garages—any space up to 750 square feet
Choose equipment based on what it can actually do
| Option | Effect | Conditions and trade-offs |
|---|---|---|
| Room or window fan | Moves air and can improve personal comfort; does not make the room’s air colder. | CDC advises using indoor fans only below 90°F. A window fan used to exhaust air needs a replacement-air path, such as another open door or window, and must be secured. |
| Portable evaporative cooler | Uses evaporation to cool air while adding moisture indoors. | Best suited to dry climates; added humidity can make it a poor fit in humid weather. Outdoor air quality and the unit’s filtration matter. |
| Window shades or reflective coverings | Reduce direct sun and heat entering through windows. | Can help limit heat gain, but the sources cited here do not establish a particular product’s tested performance, current price, or temperature reduction. |
Fans: useful for comfort, not room cooling
A fan moves air across your skin, helping sweat evaporate and making you feel cooler. It does not lower the air temperature. The CDC’s current guidance says to use indoor fans only when temperatures are below 90°F; above that, go to an air-conditioned place or use another cooler location rather than relying on a fan. The CDC’s direct warning is: “Don’t rely solely on fans to keep you cool.” Read the CDC’s guidance for people without AC.
Window fans: exhaust stale indoor air safely
A window fan can exhaust indoor air, drawing replacement air through another open door or window. Secure the fan in place and make sure the other opening is safe. Do not open windows or doors if doing so creates a fall risk or another health or safety problem. CDC guidance describes window-fan use and window safety.
Rank #2
- Fast, Effective Cooling for Rooms Up to 750 Sq. Ft: This 14,000 BTU portable air conditioner provides rapid spot cooling for spaces like bedrooms, home offices, or apartments up to 750 sq. ft. It helps quickly dissipate indoor heat, keeping you comfortable even on the hottest summer days.
- 3-in-1 Versatility: AC, Fan & Dehumidifier: More than just a cooler, this unit also functions as a dehumidifier and a circulating fan. It reduces excess indoor humidity and improves air circulation, delivering year-round comfort across different seasons and weather conditions.
- User-Friendly Controls & Eco-Conscious Design: The clear LED control panel makes operation easy, with a programmable 24-hour timer and Sleep Mode for convenient, quiet nighttime use. Designed with eco-friendly refrigerant, this energy-efficient AC helps cool your space while minimizing energy consumption.
- Easy to Move with Rolling Casters & Side Handles: Compact and sleek, this unit features smooth-rolling wheels and ergonomic side handles, so you can effortlessly move it from room to room — wherever cooling is needed most.
- Quick No-Drill Window Installation: The package includes a remote control and a complete window installation kit with an adjustable exhaust hose and window panels. Fits most double-hung or sliding windows, requires no drilling, and can be set up in minutes — ideal for renters or temporary cooling needs.
Evaporative coolers: consider climate and air quality
Evaporative cooling depends on water evaporating into the air, so these units are generally better suited to dry conditions. They add indoor humidity, making them less suitable when outdoor air is already humid. The EPA advises avoiding evaporative coolers during high outdoor air pollution if the unit lacks a high-efficiency filter. See the EPA’s indoor air quality guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do when a room is dangerously hot
Do not treat a fan as a substitute for a cooler place when indoor temperatures are above the CDC’s 90°F threshold. Hydrate, consider a cool shower or bath, reduce heat from cooking, and spend time in an air-conditioned location if one is available. Check on others who may be affected by heat. Seek medical care immediately for heat-illness symptoms such as muscle cramps, headache, nausea, or vomiting. People who need help paying energy bills can contact the Low Income Home Energy Assistance Program (LIHEAP). CDC guidance covers these steps and assistance.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOutdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchRank #3
- Three-in-One Unit: Our 14,000 BTU ASHRAE (10,200 BTU SACC) air conditioner also functions as a dehumidifier & fan. This portable air conditioner has a full function remote control & top mounted control panel with LED display
- Portable AC: Take this personal air conditioner (16.5” x 14.06” x 27.09) in rooms up to 700 sq. ft. Stay cool in the hot summer months and sleep well with this BLACK+DECKER ac unit for bedroom
- Smart AC with Voice Control: This smart air conditioner allows Wi-Fi connectivity and can be controlled using our mobile app available on iOS and Google Play stores, and voice controlled by Amazon Alexa or Google Assistant
- Follow Me Remote: Our portable AC unit comes with a full function remote control that features a FOLLOW ME function, which allows the remote to act as a thermostat for precise temperature control
- Installation Kit: When it comes to fans that blow cold air, this indoor ac unit includes an easy-to-install window kit. A large, vented airflow outlet ushers in cool air
For advice during extreme heat, follow current local health guidance; conditions and available cooling resources vary by location.
Quick Recap
Rank #4
- Three-in-One Unit: Our 12,000 BTU (8,350 BTU SACC) air conditioner also functions as a dehumidifier & fan. This portable air conditioner has a full function remote control & top mounted control panel with LED display
- Portable AC: Take this personal air conditioner (16.5” x 14.06” x 27.09) in rooms up to 550 sq. ft. Stay cool in the hot summer months and sleep well with this BLACK+DECKER ac unit for bedroom
- Smart AC with Voice Control: This smart air conditioner allows Wi-Fi connectivity and can be controlled using our mobile app available on iOS and Google Play stores, and voice controlled by Amazon Alexa or Google Assistant
- Follow Me Remote: Our portable AC unit comes with a full function remote control that features a FOLLOW ME function, which allows the remote to act as a thermostat for precise temperature control
- Installation Kit: When it comes to fans that blow cold air, this indoor ac unit includes an easy-to-install window kit. A large, vented airflow outlet ushers in cool air
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
