The reversible window system technology features two panes: one clear, airtight pane, and a smaller, tinted glass with an opening on top and bottom, which allows air to circulate between the panes.

They won’t provide the raw power and low temps of an air conditioner, but window fans can still provide an impressive amount of air circulation. Designed to fit securely into your existing window ...

Ben-Gurion University of the Negev (BGU, Israel) researchers have developed a new, highly energy-efficient window technology, featuring two reversible panes that will save energy all year round in ...

Our top pick is the Genesis A1 Window Fan. Thanks to its accordion panels, it snugly fits into most window openings but can also be used as a free-standing fan via the included feet. We also like the ...