One year of use, regular basic cleanings, deep clean…. That said, it happens to magically be out of its warranty period and required a disassembly. This design is ridiculous. The filter is only in one section, so only part of the air is being filtered. Might as well just be for show. I honestly would have never purchased this unit had I known it EASILY harbors moisture and the filter is pointless. Keep this in mind when searching for an in window air conditioner. And DO NOT use bleach, only hydrogen peroxide, as this will not damage your unit.