Greenhouses have to be designed to not merely Greenhouse Auto Vent capture solar technology but also adequately ventilate excess heat if temperatures 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 work really well because they are located where heat gathers naturally at the peak of the roof.
If vents in the roof aren’t possible, ensure that you at least have a screen to two you can open.
Ideally you would like to have cross ventilation so two windows on two sides of the greenhouse work greatest.
However you should not leave the vents or windows open at nighttime as you’ll lose any heat gain and cool your greenhouse too much.
So you close the vents or windows at 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 and your vegetation suffer if the night is too cool.