Greenhouse cold frame – Set opener automatically

The automatic opener for the greenhouse cold frame is a fully automatic device for temperature regulation.
It opens and closes the lid automatically. The opener works mechanically, without any electrical energy and is therefore a very environmentally friendly solution for temperature regulation.

How it works:
When the air in the cold frame warms up, the spring inside the cylinder expands and lifts the lid. (At temperatures between 17 and 25°C).
The warm air, which would cause heat stress to the plants, can escape through the gap.
When the air cools down, for example in the evening, the spring contracts again and the lid closes, protecting the plants from the cold.