Goldilocks and the heater

Once upon a time in the world there lived a girl.

She was a sensible girl, and when winter set in, she would put on a jumper to keep warm. But as the chill of winter made its inevitable way through the flesh and bones of her home, she would turn on a heater to increase the ambient temperature and thus reduce her bodily shivering.

But, alas. The heater would increase the ambient temperature to an uncomfortable degree. Not only would she end up removing her jumper, but she often would find herself perspiring.

As a sensible girl, she would then turn the heater down. And in due course the ambient temperature would drop enough to put the jumper back on. Unfortunately, the ambient temperature would continue to drop to the point of somatic discomfort, and the heater would have to be turned up again.

Poor girl! Sensible she may have been, yet she was unable to regulate the ambient temperature. The room was either too hot or too cold.

Oh! If only there was a way it could be just right!