If you've got one of those wax window openers, that should sort it all for you!
moonbells
ok read the other post now.
My conservatory is N facing but easily gets to about 40C if it's midsummer. I have no means of keeping it cool as the opening windows are huge (so can't leave open) and there's no venting, so I rely on hubby to open internal door when he gets in.
Things seem to grow very well regardless!