I've seen similar ads. For the ones I've seen the device isn't necessarily fake: it's just a swamp cooler. They're cheap and efficient if you're suffering in a dry heat.
ETA: the ads I've seen are still deceptive because they're claiming this is revolutionary new technology, which of course it isn't.
ETA: the ads I've seen are still deceptive because they're claiming this is revolutionary new technology, which of course it isn't.