The company has expanded its line of air conditioners using PuronÂ® refrigerant with the introduction of the Model 583B packaged gas/electric cool unit. Available in 2- and 5-ton capacities, the unit is designed for residential and light commercial applications. Delivering up to 81% AFUE heating and 12-SEER cooling, it is Energy StarÂ® approved by the Environmental Protection Agency. The product features a Turbo Tubular™ heat exchanger of aluminized steel to provide corrosion resistance and optimal heat transfer. Bryant Heating & Cooling Systems, attn: ACLS, Dept. 8583-001, 108 Metropolitan Dr., Liverpool, NY 13088; 888-999-2792; www.bryant.com (Web site).