[cameronh90]

"For a given heat, a well insulated room is as comfortable as a badly insulated one"

I actually disagree with this. There are factors beyond air temperature, such as air movement and radiation.

Air movement is pretty obvious, if your house is draughty, 20c may still feel chilly.

But radiation is commonly ignored and in my experience contributes more to comfort than air temperature beyond a certain level. If your room is at 20c and your walls are 12c, there's a good chance you will still feel uncomfortable compared to a building with well insulated walls. I've been in old buildings where even at 25c it still felt a little chilly. Worse, if only the exterior walls are cold, you might find one side of you is too hot and the other is too cold!

This is commonly experienced as "why is my house still cold in winter even though the thermostat is at 22c, when in the summer it's too hot even at 18c?".