Reversible window fan

why would you make the fan housing diameter twice as big as the diameter of the fan??? it seems l…

“Answers Because you only have to open the 10″ high window. Then you have the side extensions to cover the void. If you want large blades, purchase a 20″ box fan and open your 20” window. So it would make more wind, dust, rain. You still have the choice of operating the fans in opposite directions (In/Out) so there are 2.
Is this a decent alternative to having a whole house fan?

Bionaire Twin Reversible Airflow Window Fan

Any other window fan we’ve checked has been regularly clobbered, and several Wirecutter team members have been happily utilizing this device for years. In recent summers, though, we’ve seen new complaints crop up with this model, mentioning certain difficulties we’ve faced ourselves in re-tests. A special need is served by window fans, but they are notoriously poor materials. So, while this is the best of the bunch, any who are looking for a window fan can question themselves in the first place if they ought to buy one.

Bionaire Twin Reversible Airflow Window Fan

He defeated any other model. It’s not only more efficient, it’s also simpler to mount and use with its air reaching 8 feet away than any other fan. Its seven buttons allow you to set fan speed, air flow (in/out/exchange), thermostat (in individual degrees, vs competitor 5-degree jumps), and auto/manual activity separately (not an option on the competition). And it comes with a remote control that is useful.

Flaws but not dealbreakers

In August 2019, we found a trend of reports concerning Bionaire Twin Window fans breaking prematurely, sometimes within months of purchasing in summer 2019 (in our own comments and in Amazon reviews). This comes as a surprise, since this model has been used by several Wirecutter team members for many years without issues. One negative reviewer noted that a new fan was delivered under the Holmes name through Bionaire customer support. We think it could be the Comfort Regulation Thermostat Holmes Dual Blade Twin Window Fan that we listed in the Competition portion.

Genesis Twin Window Fan
Genesis Twin Window Fan

The second most strong fan in our tests was (occasionally mentioned as the Avalon Twin Window Fan), but we suggest it only if you absolutely can’t get the Bionaire. The breeze is slower, we sense the wind at a maximum distance of 16 foot and its less simple settings render it overly confusing to navigate simple functions. The Genesis stands out from a field of worse rivals, but putting the Bionaire aside, it’s still among the more strong versions around, it’s electronically reversible, and it’s quick enough to mount, and one good side effect of its lesser strength is that the Genesis is not as noisy as the Bionaire.

Why you should trust us

We have invested more than 50 hours studying, measuring, and living with fans to learn what it takes to transfer air efficiently around a space in researching this guide, and our guide to the best fan. We interviewed many researchers who have devoted their entire careers to learning how to cool spaces more efficiently, including: Danny Parker, a principal research scientist at the Florida Solar Energy Center; Paul Raftery, PhD, a researcher at the Urban Environment Center of UC Berkeley; and Edward Arens, PhD, director of the Environmental Architecture Research Center of UC Berkeley Sa

Genesis Twin Window Fan

Yeah, our runner-up, but really it was a marginal second position. If you want a window fan, we strongly suggest that you purchase the strongest one we’ve reviewed, the Bionaire. If, though the Bionaire runs out or if you absolutely have to pay a little less, the Genesis is the strongest of the dishonest others.

How we picked

At major retailers such as Amazon, Home Depot, Walmart, and Lowe’s, we began by assembling an extensive list of all window fans for sale. We didn’t come across that many promising new products that we hadn’t reviewed in previous updates, but we reevaluated many fans that we’ve tested (or tested and discarded in the past) to see whether some warranted a second glance. The window fan industry is not exactly filled with creativity. We also pored through these fans’ user feedback, holding an eye out for any annoyance or defect habits or time-tested reliability. We based this guide on twin-blade window fans intended to be used in standard-sized spaces, keeping with previous years, and removing single-fan versions that would be too noisy, too big, and overly strong for most people.

How we tested

During an unconscionably hot week in a New York apartment in August, we checked five window fans. In a regular double-hung window, we mounted each fan, taking careful notes about how easy it was to set up and run them for hours, day and night.

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