Greenhouses have to be designed to not only capture solar energy 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 as heat rises and you want that heat to escape.
Greenhouse roof vents work really well because 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 home window to two you can open.
Ideally you wish to have cross ventilation so 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 heat gain and cool your greenhouse an excessive amount of.
So you close the vents or windows during the 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 vegetation suffer if the night time is too cool.
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