The Tempstar 12 Model air conditioners, part of the Tempstar split-system Performance series, are available in capacities from 1-1/2 through 5 tons. When matched with EX Series coils and TD1 time delay relays, the units achieve 12 SEER, the company says. Some 12-SEER Models can achieve up to 13 SEER when matched with a variable-speed air handler or furnace. Features include external refrigerant connections, 3-1/2-inch stubs on service valves, top air discharge, a coated inlet grille, a triple-step paint process for weather resistance, rectangular chassis, prepainted condenser fins, and louvered tops.