Greenhouses have to be designed to not only capture solar technology but also adequately ventilate extra heat if temps get too hot.

You should always be sure you have sufficient vents in the roof of your greenhouse as heat rises and you want that heat to escape.

Greenhouse roof vents function really well as they are located where hot air gathers naturally at the peak of the roof.

If vents in the roof are not possible, ensure that you at least have a home window to two you can open.

Ideally you would like to have cross ventilation therefore 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 an excessive amount of.

Which means you close the vents or windows during the night and what happens the next 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 as well as your plant life suffer if the night time is too cool.

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