Greenhouses need to be designed to not merely capture solar technology but also adequately ventilate extra heat if temps get too hot.
You Greenhouse Auto Vent 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 because they are located where heat gathers naturally at the peak of the roof.
If vents in the roof aren’t possible, be sure to at least have a window to two you may open.
Ideally you would like to have cross ventilation therefore two windows upon two sides of the greenhouse work greatest.
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 the next morning: you forget! Right now 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 vegetation suffer if the night is too cool.