The easiest and most reliable way to avoid this is to install Greenhouse Vent Fan automatic greenhouse vent openers.
The last thing you need 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 small greenhouse can reach blistering temperatures in just a few hours.
After all that is how they were created. To capture solar energy.
greenhouses have lightweight roof vents and could require a more powerful vent opener to maintain them closed or prevent them being impressed – check before you buy.
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If you have a greenhouse, you understand how quickly it could heat up on a sunshiney day, even in winter.
You may make sure your greenhouse ventilation is continually regulated during hot summer months, whether you’re at home or not, by installing an automatic vent opener. It contains a wax that expands when heated, opening the vent. When the temperature falls, the wax agreements and the vent closes.