Greenhouses need to be designed to not only capture solar technology but also adequately ventilate extra heat if temperature ranges 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 work really well because 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 screen to two you may open.
Ideally you wish to have cross ventilation so two Greenhouse Auto Vent 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 heat gain and cool your greenhouse an excessive amount of.
And that means you close the vents or windows during the night and what happens 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 and your plant life suffer if the night is too cool.