Greenhouses have to be designed to not only capture solar energy but also adequately ventilate extra heat if temperature ranges get too hot.
You should always make sure you have adequate vents in the roof of your greenhouse as heat rises and you want that heat to flee.
Greenhouse roof vents function really well as they are located where hot air gathers naturally at the peak of the roof.
If vents in the roof are not possible, be sure to at least have a windows to two you may open.
Ideally you wish to have cross ventilation so two windows on two sides of the greenhouse work best.
However you should not leave the vents or windows open at 
nighttime as you’ll lose any kind of heat gain and cool your greenhouse too much.
So you close the vents or windows during the night and what happens another morning: you forget! At this point your greenhouse overheats and if you’re unlucky, you lose some plants.
Or you forget to close the vents at nighttime as well as your plant life suffer if the night is too cool.
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