The easiest and most reliable way to avoid this is to install automated Automatic Greenhouse Vent 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 small greenhouse can reach blistering temperatures in only a few hours.
After all that is how they were created. To capture solar energy.
greenhouses have light-weight roof vents and may require a more powerful vent opener to maintain them closed or prevent them being impressed – check before you get.
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When you have a greenhouse, you understand how quickly it could heat up on a sunshiney day, even in winter.
You can make sure your greenhouse ventilation is constantly 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, opening the vent. When the temperature falls, the wax contracts and the vent closes.