Genesis Twin Fan High Velocity Reversible AirFlow Fan, LED Indicator Lights Adjustable Thermostat & Max Cool Technology, ETL Certified, White (A1WINDOWFAN)

***UPDATE after one month of use*** I stand by all the details in my review below...but just want to add: I could not be happier with this fan. It appears to move more air--with less noise and more speed--than my old work horse Honeywell fan that I was replacing. If I had the choice to repurchase this fan...or my old Honeywell...I would choose this fan.***********************************************This fan replaces my inherited Honeywell dual fan (it was at least 30 years old...probably older). It was powerful...and was made when most fans were still made with metal blades. Consequently, it was very powerful for its size. As far as I'm able to tell fans of this style are no longer made with metal blades. The modern version of this fan appears to have been discontinued. I used my fan mostly to cool my bedroom by setting it for exhaust in the window of another room... with the windows in my bedroom open. It was very effective for this and on all but the hottest nights allowed me to turn my A/C off. Using a fan to draw air in this way requires a fan with a high CFM rating.I looked at a lot of the fans of this style that are being made today. None have all the significant features of my old fan. This fan had most of them...reversible (with the ability to have one fan exhausting with the other drawing), locking expandable side panels to give a good fit (important if you are using for exhaust), and a high cfm capacity. Many of the fans now made don't even list their cfm rating...this one is listed at over 700. (By comparison the new Vornado Transom fan--that many sources are rating as the best window fan--only moves a measly 80 cfm. I have one of these...and I love it for certain things. But it is completely unable to move enough air to cool a room as I describe above.)The main thing this fan doesn't have is the ability--when using for intake--to direct the airflow for each of the fans with rotating grills. I LOVED this feature on my old Honeywell. No fan currently being made--as far as I could discover--has it.I would prefer that it didn't have the bright LED lights. But I can live with this. If I were keeping the fan in my bedroom, this would bother me.In the comments for this...and similar fans...there are a lot of complaints about the "cheap plastic." Fans are plastic now. This will always feel flimsy and insubstantial...particularly in one that is supposed to be light enough to sit in a windowsill. This one feels pretty normal in that regard.The comments about noise level are all over the map. Fans are noisy. I didn't see a decibel rating on this one...but I found this one to be less noisy than most.There are also complaints that it "doesn't cool." Fans don't cool. They move air. This one excels at moving large volumes of air. If you are trying to get cool air in...or hot air out... it does the job well.

This unit is exactly what I needed. Draw in cool air. Blow out hot air. One can even draw in air while the other blows. I used this option often while prepping my bedroom a few hrs before bed. Good speed. Sound helps me sleep. Not obnoxious. I need my room to be very cool/cold in order to sleep. I do not want to use the HVAC throughout my entire living spaces just to cool one room. I have not had any issues. Very easy to place in window and operate. Its basically a boxed frame that holds two fans. I used it every night. I still have it in my window during very cold weather because the air will flow thru the blades without having it on. For me, it is very much worth the purchase.

My home office is a disconnected garage that we renovated on buying our house. It's great. It's my own space for work. But, being a garage, there are only two openings - the main garage doors (which are now sealed), and a door (well, a wooden door and a storm door now). As a result, I've always had problems getting good air flow - it can feel stuffy, humid, or even stale. The mini split we installed does a good job at maintaining temperature, but lacks a good fan breeze.So I decided to give this a try. I don't have a window, but, whenever I'm out here, the main door stays open, and the screen in the storm door is usually open, even on super hot or cold days. Since the storm door has a screen, I did a bit of a hack job - I installed some strips of dual lock velcro on the ends of the fan and on the door frame.As a result, it's strong enough to hold up the fan, and I can direct one motor in, and the other out. I feel like the air quality has increased as a result. It's certainly not a professional look or install, and having to put it up and pull it out any time I come out to my office (because of the power cable) is a bit of an inconvenience, but it has helped quite a bit.However, it's not without faults. The first downside is the fan quality. We have some high-end fans at our home and... well... these just don't match up to something like a Vornado. They can certainly move air, and, perhaps, in a sealed window frame, it would function more as expected. But, even if the fans are directed outwards, I can still feel wind coming in. But good luck getting any air flow on low settings.The other downside is the noise. On high, it sounds like a large box fan. It's loud. It's obvious a fan is going. But it's also not a completely unpleasant sound either.So, that's it. It's a basic fan. It has temperature controls that I'll probably never touch, which might be nice for you. But it's not anything special. And it works for what I need.Would I buy it again? Probably, even with my hacky setup.