Coil maximization refers to the use of inner-grooved copper and high-density aluminum fins to increase the area available for heat transfer. This technology allows our Bravo Milano 18,000 BTU Universal Floor/Ceiling units to be more compact while providing more cooling power. In our Dual-Zone packages, this means the system can extract more heat per watt of electricity used. To maintain this surface area, regular cleaning with Accessories like fin combs and coil cleaners is recommended. Our Installation Kits provide the high-quality line sets that ensure the refrigerant arrives at these coils at the correct pressure. High-density coils are a major factor in the high SEER2 ratings across our entire product catalog. It is a subtle but vital engineering detail that separates Bravo from entry-level brands.