Idea #2: heating

I've had this thought for a while, but now two things made me remember it. First, central heating in my appartment was switched on. And second: i went to a bar in London on a Thursday night.

Thing is, if you think about it, heating the whole room you're in (that means air in it, floor, walls, ceiling, furniture etc.) seems like a horrible waste of energy. In the end those inanimate objects don't feel the discomfort of being cold. So couple of days ago, while in London, we went to a bar, which had little terrace outside and we sat there (inside was all full). It was around +10°, and a little bit wet. To my surprise, after couple of seconds i felt a really nice wave of heat, but no visible source... And then i looked up.

The idea is basically this: to have an infrared lamp in the room (or lamps, depending on the size), which is able to track your motion. This lamp "follows" you around wherever you are. And since you can focus the infrared "light", you heat only the exact spot you're currently situated. Maybe there are some hidden physics issues, but it seems that you should be able to save a lot of energy.

And your drink stays cold for longer!