The easiest & most reliable way to avoid this is to install automatic greenhouse vent openers.
The last thing you need 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 just a few hours.
After all that’s how they were created. To capture solar technology.
greenhouses have lightweight roof vents and could require a stronger vent opener to keep 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 can heat through to a sunny day, even in winter.
You may make sure your greenhouse ventilation is constantly regulated during hot summer months, whether you’re in the home or not, by installing an automated vent opener. It includes a wax that expands when heated, 
opening the vent. When the temperature falls, the wax agreements and the vent closes.