Carrier® Heating & Cooling Products Infinity® Heat Pump with Basepan Heater Model: 38MPRB Performance™ Heat Pump Model: 38MARB Comfort Series Single Zone Heat Pump Model: 38MHRCQ Infinity® Heat Pump with Basepan Heater Model: 38MPRB Performance™ Heat Pump Model: 38MARB Comfort Series Single Zone Heat Pump Model: 38MHRCQ