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  1. What Is a Heat Pump? | How Does a Heat Pump Work? | Carrier

  2. Heat pump - Wikipedia

  3. What Is a Heat Pump and How Does a Heat Pump Work?

  4. Heat Pump Systems - Department of Energy

  5. Heat Pumps: Everything You Need to Know - EnergySage

  6. Understanding How Heat Pumps Work - This Old House

  7. How a heat pump works – The Future of Heat Pumps – Analysis

  8. Heat Pumps - Department of Energy

  9. How Heat Pumps Work - HowStuffWorks

  10. How Does a Heat Pump Work? - ENERGY STAR