The easiest and most reliable means of avoiding this is to set up automatic greenhouse vent openers.
The last thing you wish to 
have happen is for your plants to perish because they literally were cooked.
The sun is a robust way to obtain energy and a small greenhouse can reach blistering temperatures in simply 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 blown away – check before you buy.
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For those who have a greenhouse, you know how quickly it can heat through to a sunny day, even in winter.
You can make sure your greenhouse ventilation is constantly regulated during hot summer months, 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 contracts and the vent closes.