This is probably an extreme example because our rental seems to have been constructed and maintained to a particularly poor standard - but it’s a recent example so I will tell you anyway.
We have a 12 x 16ft south facing conservatory off our living room. 3 sides wall to ceiling glass. Solid roof. No doors between conservatory and lounge.
At 8.30am it’s 11 degrees and by 10.30-noon it’s 34 degrees (if you shut the curtain in between rooms - if you don’t, it gets to 26 degrees). This is in Dec, January, Feb. Who knew that conservatories can boil the skin off you in winter? Well, now you know.
It makes the entire open plan part of our house uninhabitable when the sun comes up and it’s not cloudy. You mostly can’t sit in there from 9am til 2.30pm if that’s the case because the sun is so bright that it is blinding.
Of course, sensible people put doors in between and build blinds in.
So, think hard and long about getting a conservatory and talk to lots and lots of people about how to make it not painfully uncomfortable.
Definitely don’t design one that goes from 11 to 34 degrees in the space of two hours because that would just be fucking stupid.