Greenhouses have to be designed to not Greenhouse Auto Vent merely capture solar technology but also adequately ventilate excess heat if temperature ranges get too hot.
You should always be sure you have adequate vents in the roof of your greenhouse as heat rises and you want that heat to flee.
Greenhouse roof vents work really well because they are located where hot air gathers naturally at the peak of the roof.
If vents in the roof are not possible, make sure to at least have a windows to two you can open.
Ideally you need to have cross ventilation so two windows upon two sides of the greenhouse work best.
However you should not leave the vents or windows open at nighttime as you’ll lose any heat gain and cool your greenhouse an excessive 
amount of.
And that means you close the vents or windows at night and what happens another morning: you forget! Now your greenhouse overheats and if you’re unlucky, you lose some plants.
Or you forget to close the vents at nighttime and your vegetation suffer if the night time is too cool.