Scented air conditioning

Yesterday was a hot night, so I decided to sleep with the air-conditioning turned on. So far, my drive to conserve energy by decreasing that use has been good. More wins than losses anyway, but perhaps it's easier to do with the rainy weather?

So I was thinking, why don't people invent a scented air conditioner unit thingy. Imagine an in built tray where you could just drop some scent in, or a purposefully built air filter strip that you just need to replace every few months or so.

Or you could buy a Glade car-scent clip on. =\