Auto Vent Opener - 2 Pack

I installed these on both vents and they've already saved me from a couple of surprise heat spikes. The automatic close when it cools is exactly what my seedlings needed.

The temperature swing in my greenhouse used to stress my seedlings, but these openers handle it perfectly—they kick in on warm afternoons and seal shut before the evening chill. Took me ten minutes to install, and the pair gives me real peace of mind even when I’m away for the weekend.

Finally, no more rushing out to open vents by hand every afternoon. These openers responded perfectly when the sun hit—closed right back up once it cooled. My greenhouse stays at a much more consistent temperature now.