Air jets work using a blower (which inflates the hot tub) that in turn pumps air through a series of tiny holes. When there is enough air to pass through the holes in the hot tub, a force is created which results in a gentle, tickling, and a pleasant massage effect. They are comparatively cheaper than hydro jets. You don’t need a building permit. Hot tubs are not subject to building regulations. However, if you want to build a separate building for the hot tub, there are some restrictions that you must be aware of (Learn more in our article).