The efficiency of air conditioning (AC) and heat pump systems is typically measured using the Seasonal Energy Efficiency Ratio (SEER) for cooling efficiency and the Heating Seasonal Performance Factor (HSPF) for heating efficiency. The higher the SEER or HSPF rating, the more efficient the system. As of my last knowledge update in September 2021, some of the most efficient AC and heat pump systems include:
-
AC Systems:
- Variable-speed or multi-stage central AC units can achieve high SEER ratings, often exceeding 20 SEER.
- Ductless mini-split AC systems can also be highly efficient, with some models reaching SEER ratings above 30.
-
- High-efficiency heat pumps can have SEER ratings well above 20 for cooling and HSPF ratings above 10 for heating. Some advanced models even exceed 30 SEER.
- Geothermal heat pumps are among the most efficient options, as they can achieve very high HSPF ratings for heating, often exceeding 10, and high SEER ratings for cooling.
Keep in mind that the most efficient systems are often more expensive upfront, but they can provide significant energy savings over time. Additionally, technology and efficiency standards may have advanced since my last update, so I recommend checking with HVAC manufacturers and professionals for the most current information on efficient AC and heat pump systems available in your area.