[tgsovlerkhgsel]

I think you missed the point - when the outside temperature doesn't go below 23, you can't really get the inside temperature below 26 or so, because as the difference gets smaller, your ability to remove heat disappears.

[eudamoniac]

I did miss the point, but also it is currently 43C outside and I keep my house at 26C to stay comfortable. Comfort is just what you train yourself to be accustomed to