The easiest and most reliable means of avoiding this is to set up automated greenhouse vent openers.
The last thing you would like to have happen is for your plants to perish because they actually 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’s how they are designed. To capture solar energy.
greenhouses have light-weight roof vents and could require a more powerful vent opener to maintain them closed or prevent them getting impressed – check before you buy.
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If you have a greenhouse, you know how quickly it could heat up on a sunshiney day, even in winter.
You can 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 agreements and the vent closes.