Science, Maths & Technology
Systems modelling
...write this, in the room that I use as an office at home. It is freezing outside, and my room is not at what I consider to be a very comfortable temperature. I can switch on an electric heater, but then if I leave the room for a period, with the heater running, it may be too hot when I get back, and the window will have to be opened, wasting all that expensive electricity!...