Bryant® Heating & Cooling Products Preferred™ Series Hybrid Heat/Electric Cool Systems Model: 677E Preferred™ Series Heat Pump Systems Model: 607E Preferred™ Series Gas Heat/Electric Cool Systems Model: 577E Legacy™ Line Hybrid Heat/electric Cool Systems Model: 677C Legacy™ Line Heat Pump Systems Model: 607C Legacy™ Line Gas Heat/electric Cool Systems Model: 577C Base Line Heat Pump Systems Model: PH4Z