Guaranteed installed pricing means that the pricing displayed includes replacing an existing indoor and outdoor unit (or package unit) in one day or less, with 2 installers and connecting to existing electrical and ductwork. Equipment relocation, substantial modifications to supply or return ductwork, electrical modifications, or attic installations will incur an additional fee, which can be quoted prior to starting the job. If your system is down and just needs replacing, chances are very good that you will qualify for standard installation, subject to the above. We work hard to ensure the lowest possible price and keep quality installation times as short as possible.