Greenhouses need to be designed to not merely capture solar technology but also adequately ventilate excess heat if temperatures 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, be sure to at least have a window to two you can open.

Ideally you need to have cross ventilation therefore 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 kind of heat gain and cool your greenhouse too much.

Which means you close the vents or windows during the night and what happens another morning: you forget! Now your greenhouse overheats and if you’re unlucky, you lose some plants.

Or you Greenhouse Auto Vent forget to close the vents at nighttime as well as your plants suffer if the night time is too cool.