The easiest & most reliable way to avoid this is to set up automatic greenhouse vent openers.
The last thing you wish to have happen is for your plants to perish because they literally were cooked.
The sun is a robust way to obtain energy and a little greenhouse can reach blistering temperatures in only a few hours.
After all that is how they are designed. To capture solar energy.
greenhouses have light-weight roof vents and may require a stronger vent opener to keep them closed or prevent them being impressed – check before you get.
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When you have a greenhouse, you know how quickly it could heat through to a sunshiney day, even in winter.
You may make sure your greenhouse ventilation is continually regulated during hot summer months, whether you’re in the home or not, by installing 
an automated vent opener. It includes a wax that expands when heated, starting the vent. When the temperature falls, the wax contracts and the vent closes.