Pull In Night Air, Push Out Heat: Best Window Fan Options by Sash Width and Mode

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The best window fan is the one that fits your window opening and moves air in the direction you need: cool evening air in, or warm, stale air out. Window fans sit in the sash, so the width range on the listing matters as much as the speed count.

We compared six window fans sold by Amazon.com and in stock: four twin-blade units with accordion expanders and two low-profile Vornado models that sit in a short horizontal opening. We looked at listed fit ranges, how each one reverses airflow (a button, a mode setting or turning the whole unit around), remotes, timers and the one thermostat-style control on the page.

Every fact below comes from the product listings and spec fields. Where a listing makes a quiet, airflow or weather-resistance claim, we attribute it to the brand. One caution before you shop: a fan is a ventilation tool, not an air conditioner, and on the hottest days it has limits we cover in the safety section.

Our Top Window Fan Picks at a Glance

Price key: $ under $50 · $$ $50–$100 · $$$ $100–$175 · $$$$ $175+. Prices change often; check Amazon for today’s price.

1. Comfort Zone CZ310R Twin Window Fan: Best Overall

Comfort Zone’s CZ310R is a twin window fan: two 9-inch fans in one housing, with accordion panels on the sides that stretch to fill the window. Close the sash down on top of it and the fan pulls air through the window opening. The listing says the expanders adjust from 23-1/2 to 37 inches and lock in place once set.

Three modes make it more flexible than a fan you have to flip around. In Cool, both fans pull outside air in. In Exhaust, both push indoor air out. Circulate runs one fan in each direction, so one side brings fresh air in while the other sends stale air out. Comfort Zone lists three speeds, 70 watts and 120 volts.

The included remote handles power, speed and mode, which is the practical feature for a bedroom window: you can change it from bed instead of walking to the sill. A fabric cover and a bug screen are named in the title. The spec fields list a 5.6-pound weight and a size of 25.7 x 5.6 x 14.6 inches, and the warranty field reads “1 Year Warranty Against Manufacturer Defects.”

It suits double-hung windows in bedrooms and living rooms, especially for people who want to pull cool evening air in and later reverse the flow without lifting the fan out of the window.

Why we like it

• Three airflow modes
• Remote included
• Wide 23-1/2 to 37 inch fit

Watch out for

There’s no timer or thermostat, and this listing doesn’t name a safety certification, so check the label on the unit when it arrives.

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2. Comfort Zone CZ319WT2 Twin Window Fan: Best Budget Twin Fan

The Comfort Zone CZ319WT2 strips the twin window fan down to the basics: two fan blades, a three-position dial and accordion expanders. Comfort Zone says it is designed to pull in fresh outside air and circulate it evenly in the room.

Reversing is manual. To push warm, stale air out instead of pulling air in, the listing says you turn the whole unit around in the window. That takes a minute, so it works best if you mostly run it one way, for example intake at night. With no remote, every speed change also happens at the window itself. The three speeds are Low, Medium and High on a manual dial.

Its auto-locking expanders adjust from 22-1/4 to 33 inches and lock automatically, according to the listing. A removable bug screen and fabric cover are included, and two removable feet let you set it on a desk or floor when it isn’t in a window, so it can stay useful after the window season ends. The listing says it is ETL certified. The spec fields give a 4.6-pound weight and a size of 4.88 x 22.5 x 10.88 inches, with a one-year warranty against manufacturer defects.

It suits smaller windows, dorm rooms and anyone who wants an inexpensive way to move air through one window without extra features to learn.

Why we like it

• Light and easy to lift into place
• ETL certification stated
• Doubles as a tabletop fan

Watch out for

Changing from intake to exhaust means lifting it out and turning it around, and the expanders stop at 33 inches.

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3. Vornado Transom Window Fan: Best With Thermostat Control

Vornado’s Transom takes a different shape from a twin fan. It’s a long, low box that sits across the bottom of the window opening, with foam blocks filling the gaps on either side. Vornado says it fits single- or double-hung windows 26 to 40 inches wide with an opening at least 8 inches tall, using what it calls a Soft-fit foam block system.

Reversing is electronic. One button switches between fan mode and exhaust mode, so there’s nothing to flip or lift. The listing names four speed settings, a remote and “auto temperature control,” which is the closest thing to a thermostat among our picks. Vornado describes the case as weather resistant in the title.

Install details matter here. Vornado lists the product at 7.16 inches tall, 26 inches wide and 5.73 inches deep, says a window screen may need to come out depending on window depth, and says it can only be installed horizontally. The spec fields give 8.3 pounds, and the warranty field reads “5 year manufacturer.” Vornado also notes it is built for U.S. voltage and warrantied for use only in the U.S.

It suits wide windows in living rooms and bedrooms, and buyers who want to set a temperature-style control instead of switching speeds by hand.

Why we like it

• Temperature-based control
• One-button reverse
• Longest warranty field here

Watch out for

Measure depth as well as width: Vornado says the screen may need removing, and it only installs horizontally.

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4. Vornado Portal Window Fan: Best Low-Profile Window Fan

The Vornado Portal is the smaller, simpler sibling to the Transom. It is a low horizontal fan that sits in the bottom of the window opening, and Vornado says it fits windows 24 to 38 inches wide using a modular block system to fill the space on each side.

Like the Transom, it reverses without being flipped. Vornado says a touch switches it between fan mode, pulling outdoor air in, and exhaust mode, pushing stale indoor air out. There are three speed settings, and Vornado describes the controls as intuitive and quiet; noise is the brand’s claim, as no decibel figure is listed.

The listing puts it at 6.58 inches tall, 23.85 inches wide and 6.12 inches deep, and the spec fields give 6.9 pounds. Vornado says it works in single-hung and double-hung windows with at least an 8-inch-tall opening, that the window screen may need removing depending on window depth, and that it installs horizontally only. It is built and warrantied for U.S. use, per the listing, though the warranty field itself is empty.

It suits kitchens and bedrooms where you want a tidy fan that leaves most of the window clear, and buyers who are happy to adjust it by hand rather than from a remote.

Why we like it

• Slim, low shape
• Reverses at a touch
• Fits a wide range of window widths

Watch out for

The warranty field is blank, and there’s no remote, so you’ll walk to the window to change settings.

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5. Tornado BFC-9ER Dual Window Fan: Best for Bedrooms With a Timer

The Tornado BFC-9ER is a twin 9-inch window fan with the feature list of a pricier unit: a remote, three speeds, three modes and an 8-hour timer. Its expandable panels stretch from 23.5 to 36 inches, according to the listing, and a detachable base lets it stand on its own.

Modes cover the usual window-fan jobs: cooling pulls air in, exhaust pushes hot air out, and circulation runs the fans in opposite directions. The timer is the reason to pick it for a bedroom, since you can set it to run for part of the night and switch itself off. Tornado lists fan speeds of 1378, 1265 and 1132 RPM. A remote handles speed, mode and timer from across the room, so you don’t need to reach the sill once it’s installed.

Tornado claims 1,350 CFM of airflow and a “quiet 49 dB noise level.” Those are the brand’s figures, not our measurements. The listing says it is ETL certified and backed by a one-year warranty, and it notes a 4.9-foot power cord. The spec fields list 5.5 pounds and a size of 6.5 x 23.23 x 12.99 inches.

It suits bedrooms and home offices where you want to set the fan and forget it, and households that want a remote without paying Vornado prices.

Why we like it

• 8-hour timer
• Three modes on a remote
• ETL certification stated

Watch out for

Its sales rank is far weaker than the other picks, and the 4.9-foot cord limits how far the outlet can be from the window.

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6. EZ-Chill 9-Inch Twin Window Fan: Best Simple Two-Speed Twin

EZ-Chill’s 9-inch Twin Window Fan keeps things simple: two fans, two speeds and a manual reverse. The low setting is meant for a gentle breeze and the high setting for a brisker one, according to the listing.

Its auto-locking accordion expanders adjust to fit window openings from 22-1/2 to 34 inches, the listing says. To switch from bringing outside air in to pushing hot air out, you reverse it by hand. The title lists airflow at 9.84 feet per second, which is the brand’s figure. Measure the inside width of your window opening against that range before you order, since the panels can’t stretch past 34 inches.

Away from the window, two feet let it sit on a tabletop or other flat surface, and a carrying handle makes it easy to move between rooms. That makes it handy for a guest room that only needs a fan now and then, since it can come out of the window and sit on a dresser instead. EZ-Chill describes it as “ultra quiet,” though no decibel figure is given. The spec fields list a size of 5.63 x 22.75 x 11.63 inches and a one-year warranty against manufacturer defects; the weight field is empty.

It suits a spare room, kitchen or office window where you just want air moving in or out, and anyone who would rather not pay for a remote or extra modes they won’t use.

Why we like it

• Simple two-speed control
• Carry handle
• Tabletop feet

Watch out for

Two speeds and a manual reverse are the whole feature set, and the weight isn’t stated.

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How We Chose the Best Window Fans

We started with window fans sold by Amazon.com and in stock, then kept no more than two per brand and only where the product lines differ. For each pick we compared:

• Fit range: the listed minimum and maximum window width, plus any minimum opening height.
• Reversing: whether airflow changes with a button, a mode setting or by turning the unit around.
• Controls: speeds, remotes, timers and temperature control, as listed.
• Brand claims: airflow, noise and weather-resistance figures, attributed to the maker.
• Listing evidence: warranty field, weight, size, safety certification wording and Amazon sales rank.

Window Fan Buying Guide

Best Twin Window Fan: Expanders and Fit Range

Twin fans use accordion expanders to fill the sides of the window. Measure the inside width of the opening and compare it with the listing: the Comfort Zone CZ310R covers 23-1/2 to 37 inches, the Tornado 23.5 to 36, the EZ-Chill 22-1/2 to 34 and the budget Comfort Zone 22-1/4 to 33. If your opening sits near the top of a range, choose the fan with headroom.

Best Reversible Window Fan

All six picks can bring air in or push it out, but the effort differs. The two Vornados reverse with a button. The Comfort Zone CZ310R and the Tornado switch modes from a remote, and both add a circulate setting that runs one fan in each direction. The budget Comfort Zone and the EZ-Chill reverse manually; the Comfort Zone listing says you turn the unit around in the window.

Best Window Fan for Bedroom Use

For a bedroom, a remote and a timer do more than an extra speed. The Tornado is the only pick with a timer (8 hours), and it, the Comfort Zone CZ310R and the Vornado Transom include remotes. If you want to pull cool air in after dark, the Ready.gov extreme heat page also suggests covering windows with drapes or shades during the heat of the day.

Best Quiet Window Fan

Only one listing gives a number: Tornado claims 49 dB. Vornado calls the Portal’s controls quiet and lists the Transom as a quiet window fan, and EZ-Chill says its fan is “ultra quiet,” but none of those listings gives a decibel figure. Treat quiet claims as the brands’ own, and run any fan on its lowest speed if sound is your main concern.

Best Window Fan With Thermostat Control

The Vornado Transom is the only pick whose listing names “auto temperature control.” The others rely on you to change speeds or switch the fan off, or, in the Tornado’s case, on a timer.

Window Fan, Box Fan or Pedestal Fan?

A window fan is built to sit in the sash and exchange indoor and outdoor air. If you need to move air around inside a room instead, see our guide to the best pedestal fan.

Window Fan Safety: Kids, Heat and Cords

Window falls. A window fan keeps the sash open, and the fan’s bug screen is not a barrier. HealthyChildren.org’s home safety tips for families say that a screen is not strong enough to prevent a fall, recommend opening windows from the top if possible or installing operable window guards that only an adult or older child can open from the inside, and advise never putting chairs, sofas or anything a child might climb on in front of a window. Keep that in mind before you put a fan in a child’s room.

Window security. A fan in a partly open window also leaves a gap that is easier to work on from outside. When the fan comes out, close and lock the window; our guide to the best window locks covers sash locks and stoppers that limit how far a window opens.

Heat. Ready.gov’s extreme heat guidance says not to rely on a fan as your primary cooling device, because fans create air flow and a false sense of comfort but do not reduce body temperature or prevent heat-related illnesses. On the hottest days, an air-conditioned room is the safer choice; see our best window air conditioner guide.

Cords and outlets. The U.S. Fire Administration’s appliance and electrical fire safety page advises against overloading outlets, says to insert plugs fully, and warns against putting cords where they can be damaged or pinched, like under a carpet or rug. Plug a window fan into a nearby wall outlet, keep the cord out of walkways, and replace any fan with a cracked or damaged cord, as USFA advises for appliances.

Window Fans and Your Insurance

A fan left in an open window during a storm can let rain in, and a ground-floor window held open by a fan is less secure. How a policy treats water that comes in through an open window, or a theft through one, depends on your coverage, so ask your agent. Our Ohio homeowners insurance guide and renters insurance costs in Ohio explain the basics.

Frequently Asked Questions

What is the best twin window fan?

Our top twin pick is the Comfort Zone CZ310R. It ranks #1 in Amazon’s Window Fans category, fits openings from 23-1/2 to 37 inches, and its remote switches between cool, circulate and exhaust modes.

What is the best reversible window fan?

For the easiest reversing, the Vornado Transom and Vornado Portal switch between fan and exhaust at a button press, per their listings. The Comfort Zone CZ310R and Tornado BFC-9ER change modes from a remote, and the budget twin fans reverse manually.

Is there a window fan with a thermostat?

Among our picks, only the Vornado Transom lists “auto temperature control.” It also has four speeds, a remote and a listed fit of 26 to 40 inches wide.

What is the best quiet window fan for a bedroom?

Tornado is the only brand here that lists a figure, claiming 49 dB for the BFC-9ER, which also has a remote and an 8-hour timer. Vornado and EZ-Chill describe their fans as quiet without giving decibel numbers.

Can a window fan replace an air conditioner in a heat wave?

No. Ready.gov says not to rely on a fan as your primary cooling device, because fans do not reduce body temperature or prevent heat-related illnesses. Use a fan for ventilation and find an air-conditioned space when it’s extremely hot.

The Bottom Line

For most windows, the Comfort Zone CZ310R is the best window fan to start with: three modes, a remote and a wide 23-1/2 to 37 inch fit. The Comfort Zone CZ319WT2 and EZ-Chill cover simple, low-cost intake or exhaust. The Tornado BFC-9ER adds a timer for bedrooms, and the Vornado Transom and Portal trade accordion panels for a slim, low shape, with the Transom adding temperature control. Measure the window first, then pick by the controls you’ll actually use.

Wondering how your policy handles storm water through an open window or a break-in? Call Jeff Smith’s State Farm office at (740) 354-7747 or get a free coverage review.