Carrier Geothermal Heat Pumps Products vary by dealer. Please consult your local dealer for product specifics. GWUp to 25.7 EERUp to 3.8 COP GZUp to 29.1 EERUp to 5.2 COP GBUp to 28.1 EERUp to 5.2 COP GPUp to 30 EERUp to 4.6 COP GCUp to 37 EERUp to 5.2 COP