Greenhouses have 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 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, make sure to at least have a home window to two you can open.
Ideally you need to have cross ventilation therefore two windows on two sides of the greenhouse work greatest.
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.
And that means you close the vents or windows at night and what occurs another morning: you forget! Today 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.
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