Greenhouses need to be designed to not merely capture solar technology but also adequately ventilate excess heat if temps get too hot.
You should always be sure you have adequate vents in the roof of your Greenhouse Auto Vent greenhouse as heat rises and you want that heat to escape.
Greenhouse roof vents work 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 windows to two you can open.
Ideally you would like to have cross ventilation so two windows on two sides of the greenhouse work best.
However you shouldn’t 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 occurs another 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 plants suffer if the night is too cool.