Evaporator matching is the engineering requirement that the indoor head's capacity exactly matches the signal sent from the outdoor condenser. This is why our Bravo Milano 9,000 BTU units must be paired with the correct port on a Multi-Zone condenser. In a Tri-Zone setup, matching allows for three different sized rooms to be cooled perfectly by a single outdoor unit. To ensure these matches are secure, our Installation Kits provide the exact flare sizes for each BTU tier. You can find a variety of matched heads in our UFC Multi-Zone collection to suit any room size. If you choose to wall-mount these matched units, a high-quality Wall Bracket ensures they stay in place for the long haul. Proper matching is the only way to guarantee the SEER2 efficiency and BTU output advertised on the box.