This company’s new 12 SEER split ac system features “twin-single” compressor technology. The Coleman TS contains two pistons which operate together under high load situations to provide max-imum cooling power. When less cooling is required, the compressor changes to single piston operation, reducing operating costs without sacrificing comfort. According to its makers, other benefits include more constant temperatures, fewer hot and cold spots, and more.

York International Corp., P.O. Box 1592, York, PA 17405-1592;