The temperature-sensitive, solar powered Univent Cold-Frame Window Opener ventilates automatically. It can be adjusted to open at any temperature between 60 degrees and 77 degrees, extend to 18 inches, and lift a window weighing up to 15 pounds. It is made of corrosion-resistant materials and features double closing springs, a quick-disconnect mounting bracket, and detachable arms, which allows full access to the inside of the frame. This automatic opener can also be used for standard greenhouses, lean-to greenhouses, and sliding Dutch doors.