What is the Gradient's Combined Energy Efficiency Ratio (CEER) rating of the Moderate Weather window heat pump? June 11, 2024 20:33 Updated 10.8 CEER Related articles How is the Gradient heat pump different from other heat pumps? Aren’t all AC’s heat pumps? Where is the Gradient's compressor? Does the Gradient have an inverter, like some minisplits do? What is the Combined Energy Efficiency Ratio (CEER) rating of the All-Weather 120V window heat pump? What kind of refrigerant does the Gradient use?