The easiest & most reliable way to avoid this is to set up automatic greenhouse vent openers.
The last thing you want 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 only a few hours.
After all that is how they were created. To capture solar technology.
greenhouses have lightweight roof vents and may require a stronger 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 understand how quickly it could heat up on a sunshiney day, even in winter.
You can make sure your greenhouse ventilation is Greenhouse Vent Fan continually regulated during hot summer months, whether you’re in the 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 contracts and the vent closes.