Greenhouses have to be designed to not only capture solar energy but also adequately ventilate extra 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 escape.
Greenhouse roof vents function really well as they are located where heat gathers naturally at the peak of the roof.
If vents in the roof are not possible, make sure to at least have a window to two you may open.
Ideally you need to have cross ventilation therefore 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 kind of heat gain and cool your greenhouse an Greenhouse Auto Vent excessive amount of.
So you close the vents or windows at night and what occurs 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 and your vegetation suffer if the night time is too cool.