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The Resilience Hub & Portland Maine Permaculture Message Board › Automatic Greenhouse Vent Opener

Automatic Greenhouse Vent Opener

David H.
Oxford, ME
Post #: 120
We discussed this last night...
Automatic Greenhouse Vent Opener

Free flow of air without draughts is essential especially during the growing season. The Automatic Vent Opener uses temperature sensitive cylinders that expand and contract to automatically open and close your greenhouse vents. Provides ideal growing conditions, even when no one is home! Easy to install, the opener simply replaces an existing vent arm. Ideal for hinged vents weighing less than 15 lbs. May be adjusted for different opening temperatures. No batteries or electricity required. One-year warranty.

Lisa F.
Group Organizer
Portland, ME
Post #: 53
Here's the one for cold frames from Johnny's Selected Seeds also....


Looks like you have to be using a hinged-lid cold frame for this to work, but I've heard people rave about this so that you don't "cook" your plants if you forget to open the cold frame on a warm sunny day.
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