The easiest & most reliable means of avoiding this is to install automatic 
greenhouse vent openers.
The last thing you need to have happen is for your plants to perish because they literally were cooked.
The sun is a powerful way to obtain energy and a Greenhouse Vent Fan little greenhouse can reach blistering temperatures in only a few hours.
After all that is how they are designed. To capture solar technology.
greenhouses have light-weight roof vents and may require a stronger vent opener to maintain them closed or prevent them becoming impressed – check before you get.
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If you have a greenhouse, you know how quickly it can heat through to a sunshiney day, even in winter.
You may make sure your greenhouse ventilation is continually regulated during hot summertime, 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 contracts and the vent closes.