Experience efficient air delivery with this 8-inch electrically reversible twin window fan. Along with its two 8-inch PP plastic blades and safety guards, the unit comes equipped with a rain-resistant independent motor that pulls cool air in and pushes stale air out. After choosing one of three speeds, set the adjustable thermostat for automatic comfort control. The fan fits windows at least 22-4/5 inches wide and at least 11-3/5 inches high, and its built-in adjustable slide scre…
Buy Optimus F-5285 8-Inch Electrically Reversible Twin 3-Speed Window Fan with Thermostat, white at Amazon

Review
This double window fan can draw in fresh, cool air from the outside or exhaust stale, hot air from inside. Or, because of the independent draw-in and exhaust-out settings, it can do both simultaneously. With a thermostat that turns the fan on and off according to a preset temperature level, plus three speeds for each fan, the unit adjusts nicely to conditions. Designed to fit double-hung, vertical, and casement windows, the fan comes with a built-in 7-inch extender and…
Buy Holmes HAWF-2041 Twin Window Fan at Amazon

Manually Reversible for Air Intake / Exhaust or Air Exchange / Adjustable Extender Panels to fit virtually All window sizes / 2 Speed Settings

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Buy Holmes HAWF2030 Twin Window Fan with Comfort Control Thermostat at Amazon

Two 8″ Fans Two Whisper-Quiet Speeds Manually Reversible for Air Intake or Exhaust E-Z-Click Expander Panels for a Safe, Custom Fit Fits Windows 22″ to 34″ Wide and 10″ High and Larger Fully Assembled U.L. Listed The 8″ Twin Window Fan can really keep you comfortable. Its thermostat feature makes it ideal for nighttime use. When the temperature falls below the set level, the fan will automatically turn off, making chilly 3am wake-ups a thing of the past.

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Buy 8″ Reversible Twin Window Fan at Amazon

Combining maximum versatility with exceptional convenience, this 8-inch electrically reversible twin window fan features independent motor control for air intake, exhaust, or exchange. Choose between two whisper-quiet speeds, and then set the adjustable thermostat for automatic comfort control. The fan fits windows 25 to 35 inches wide and at least 12 inches high, while its E-Z-Click expander panels ensure a safe, custom fit. Shipped fully assembled for window use, the versatile u…
Buy Lasko 2138 8-Inch Electrically Reversible Twin Window Fan at Amazon

The Bionaire Twin Window Fan with Electronic Thermostat is designed and safe for use in a window. In addition to the elegant design of the fan, it also comes with twin 9″ blades, an electronic thermostat, multiple speed settings, electrically reversible motors, built in extender screen, and a bonus extender panel. The electronic thermostat allows you to set your desired comfort level and the fan will automatically cycle on or off to maintain the set temperature. This product is …
Buy Bionaire Remote Twin Window Fan BW2100R-U at Amazon

Equipped with two fans in one, this slim window fan can be used to draw in fresh, cool air from outside or to exhaust stale, hot air from inside out. It can even do both simultaneously thanks to its electrically reversible fans with independent “intake/exhaust” controls. The unit also provides an electronic one-touch thermostat with an easy-to-read LED display panel that makes it effortless to control personal comfort levels. Choose from 60, 65, 70, 75, and 80 degrees F, as well a…
Buy Sunbeam SWF4300 Twin Window Fan with Electronic Thermostat at Amazon

Review
This double window fan draws in fresh, cool air from the outside or exhausts stale, hot air from inside. It can also do both simultaneously, because each of the two fans can be set independently to draw in or exhaust out, allowing the unit to exchange inside and outside air. Operable either manually or automatically–with its thermostat turning the fans off and on to maintain a selected temperature–the unit has a one-touch electronic control and two speeds so it can be adju…
Buy Holmes HAWF2043 Twin Window Fan at Amazon

The Holmes Twin Window Fan is specifically designed and safe to use in a window. This product comes with two 6.5 inch blades, multiple speed settings, and a built in extender screen to help secure the fan into the window. This product can fit into virtually all double hung and slider windows and can also be used with a window screen in place.

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Buy Holmes 7 Twin Window Fan HAWF2021-U at Amazon