The easiest & most reliable means of avoiding 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 powerful source of energy and a little greenhouse can reach blistering temperatures in simply a few hours.
After all that is 
how they were created. To capture solar technology.
greenhouses have light-weight roof vents and could require a more powerful vent opener to maintain them closed or prevent them being impressed – check before you get.
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Should you have a greenhouse, you know how quickly it can heat up on a sunny day, even in winter.
You may make sure your greenhouse ventilation is 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, starting the vent. When the temperature falls, the wax contracts and the vent closes.