The easiest & most reliable means of avoiding this is to install automatic greenhouse vent openers.

The last thing you would like to have happen is for your plants to perish because they literally were cooked.

The sun is a robust source of energy and a little greenhouse can reach blistering temperatures in simply a few hours.

After all that is how they are designed. To capture solar energy.

greenhouses have lightweight roof vents and could require a stronger vent opener to maintain them closed or prevent them being impressed – check before you buy.
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If you have a greenhouse, you know how quickly it could heat through to a sunshiney day, even in winter.

You can make sure your greenhouse ventilation is constantly regulated during hot summer months, whether you’re at home or not, by installing an automatic vent opener. It includes a wax that expands when heated, starting the vent. When the temperature falls, the wax agreements and the vent closes.