AWG are basically air conditioners, like the ones you have at home. They produce water by condensing ambient vapor the same way an A/C does, but instead of throwing it away, they serve it to you with some post-treatment. As an A/C, they work with refrigerants or gas-fuels, consume a lot of energy, require skilled personnel to maintain it, and produce a huge carbon footprint when refrigerants get lost to the atmosphere.