Hey all. I was looking into building a coldframe for my garden, and I came across a Heat-Activated Window Opener
"It incorporates a gas-charged cylinder of adjustable volume. As the temperature rises, the gas expands; it will open a 15 lb window, more than adequate in cold frames and greenhouses. A simple adjustment lets you control the operating range. As temperatures fluctuate, the 12-1/2" long unit will open and close a window as necessary to prevent disasters. "
It’s from Lee Valley, so I ‘m pretty sure of it’s quality… but I’ve never heard of these before. Has anyone else used them? Do they work as well as you’d expect? We’ve talked about greenhouses and coldframes before… and I don’t recall this coming up…
