The easiest and most reliable way to avoid this is to install automated greenhouse vent openers.
The last thing you want to have happen 
is for your plants to perish because they actually were cooked.
The sun is a powerful 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 light-weight roof vents and may require a more powerful vent opener to maintain them closed or prevent them being blown away – check before you get.
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If you have a greenhouse, you know how quickly it can heat through to a sunny day, even in winter.
You may 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.