The ACS2 models, available in capacities from 1.5 to 5 tons, offer high efficiency (capacities range from 16.3 to 57.0 MBH with efficiencies ranging from 10.5 to 13.0 SEER when matched with Tempstar EP and EX coils, or the FCP, FCX, or EV air handlers); ease of installation and service; quiet operation; and weather resistance (a coated inlet grille resists corrosion and provides protection for coil fins).