Greenhouses have to be designed to not merely capture solar energy but also adequately ventilate extra heat if temps get too hot.
You should always make sure you have sufficient 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 heat gathers naturally at the peak of the roof.
If vents in the roof are not possible, be sure to at least have a windowpane to two you can open.
Ideally you would like to have cross ventilation therefore 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 an excessive Greenhouse Auto Vent amount of.
And that means you close the vents or windows at night and what occurs the next 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 as well as your plant life suffer if the night time is too cool.