The easiest and most reliable way to avoid this is to install automatic greenhouse vent openers.
The last thing you wish to have happen is for your plants to perish because they actually were cooked.
The sun is a robust source of energy and a small greenhouse can reach blistering temperatures in only a few hours.
After all that is how they are designed. To capture solar energy.
greenhouses have lightweight roof vents and may require a stronger vent opener to keep them closed or prevent them getting impressed – check before you get.
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For those who have a greenhouse, you understand how quickly it can heat through to a sunshiney day, even in winter.
You may make sure your greenhouse ventilation is constantly regulated during hot summertime, whether you’re in the 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.