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? What is the minimum efficiency reporting value (MERV) rating of the filter? Does the Gradient have an inverter, like some minisplits do? What kind of refrigerant does the Gradient use?