Greenhouses need to be designed to not merely capture solar energy but also adequately ventilate excess heat if temps 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 as they are located where hot air gathers naturally at the peak of the roof.
If vents in the roof aren’t possible, be sure to at least have a windowpane to two you may open.
Ideally you need to have cross ventilation therefore two windows upon two sides of the greenhouse work greatest.
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.
So you close the vents or windows at night and what occurs another 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 as well as your plants suffer if the night is too cool.
Greenhouse Auto Vent transformed my life right!