I live in a first floor flat and dread this weather. The hallway has no windows as our front door is downstairs (self contained) and the rooms all lead from it. None of the rooms have windows in the right place to create a through breeze if the doors are left open. The temperature in the hallway hit 31 on Tuesday and has only gone down to 27 this morning. It doesn't help that the cat is an indoor cat and my daughter is scared that if the windows are opened more than an inch, it'll get out. This week, as you can imagine, has been like living in the bowels of hell! I've been 'persuading' the cat into another room after the sun has gone down so I can throw the windows fully open in the lounge, at least for an hour or so and walking the dog at sunset with him grumbling all the way. (He's like me - hates the heat!)
Conversely, in winter, the bedrooms freeze and are impossible to heat...
Whoever designed this place should be made to spend a week in it in this heat and another in winter.