Greenhouses need to be designed to not merely capture solar technology but 
also adequately ventilate extra heat if temperature ranges 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 flee.
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 are not possible, be sure to at least have a home window to two you can open.
Ideally you want 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 happens another morning: you forget! At this point 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 time is too cool.
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