Looking to cut down your home heating and cooling costs? Trane TruComfort™ Variable speed systems do just that. Trane TruComfort™ runs at the speed necessary to keep your home continuously comfortable – automatically adjusting up and down within one-half degree of your setting and constantly circulating air. The result? Running at up to 21 SEER (Seasonal Energy Efficiency Ratio) – which means affordable residential heating and air for you.