Holmes HAWF2043 Twin Window Fan

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 adjusted to conditions. It's designed to fit double-hung, vertical-slider, and casement windows. A built-in 7-inch extender and two 3-inch extenders permit custom fitting for windows from 24 to 37 inches wide. Because the unit is lightweight plastic it can be moved easily from room to room. The fans have six blades and measure 8-1/2 inches in diameter. Overall, the unit is 12-1/4 inches high, arrives fully assembled, and carries a three-year warranty against defects. --Fred Brack
Customer Review: Window fans
Easy to install and seems to work quite well. It is not as powerful as the Honeywell dual control window fan it replaced, but then, the Honeywell died in less than a year of operation. The Holmes dual fan I have in the kitchen has been running steadily without a glitch for four years. I hope this one will do as well in the bedroom. I wish they had the power of the Honeywell-- but I guess, endurance is worth more than power when it comes down to dollar value.
Customer Review: Nice inexpensive fan
I bought this fan to cool off my garage,it does not move a tremendous amount of air but it does the job and is relatively quiet. I like the automatic temperature control feature.