Holmes 7 Twin Window Fan, HAWF2021-U
Review by Pei-Tsen Tao : Best choice for your money's worth

Holmes 7 Twin Window exhaust fan is exactly what I had imagined for a $16.99 fan. Simple functions and compact size that fits my window. The noise may be a little loud and 3 feet wire may be a little short. Most houses don't have outlets near windows so extension cords may be a must have accessory. The bottom line is, it is the most inexpensive fan I can find that fits my window and it does the job.

Holmes 7 Twin Window Fan, HAWF2021-U
Review by John B. Goode "JBG" : Excellent!

The pros and cons of this fan can be easily summed up:

Pros:
1) Cheap
2) Easy to install.
3) Very strong, even on the low setting. I have this fan set up behind me in a back window 20 ft away and I can still feel the air, and that's on the low setting. The house is hot after a hot day and during the evening I set this up to blow the cool night air into the room. The air is so deliciously cool that it feels like air conditioning, in fact better because it doesn't have any air conditioning air smell, just sweet fresh night air.

Cons:
1) Noisy. It doesn't rattle or shake or anything, it's just that it has a powerful motor and it's the noise of the motor and the air swishing through. The noise is like living next to a waterfall, after a while I don't even think about it.

Summary:
I certainly have no complaints. It's cheap and does what it was advertised to do very well. The set up was easy and it's not a big deal for me to reverse the fan to vent. In fact, I wish I bought two of them so I could put them on opposite windows to really circulate the air in and out of the house.

A floor fan doesn't do anything more than circulate the warm air that's already in the house. I use to have a box fan that I set up in the window but this fan is much, much better. Highly recommended. I deducted 1 star for the noise but the low price more than makes up for it.

Holmes 7 Twin Window Fan, HAWF2021-U
Review by Franz "windy days" : Incorrect dimensions provided

The product description says this fan accommodates a window up to 36" wide. This is not true. The actual product accommodates windows up to 33.25" wide. This is confirmed in the product manual. It can be made to accommodate larger windows but this requires purchase of additional extender panels from the manufacturer, for $5 + shipping for each 4.25" extender panel