Amazon.com has a Holmes HAWF2043 Twin Window Fan for $29.99 with Free Shipping.
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- Draws in cool air, exhausts hot air, or exchanges air with outside n
- One-touch electronic control: two speeds and temperature selection n
- Thermostat turns fan off/on to maintain selected comfort level n
- Fits double-hung, vertical slider, and casement windows 24 to 37 inches wide n
- Extenders permit custom fit; 12-1/4 inches high overall, with 8-1/2-inch fans