1. Entering water temperature has a significant effect on heat pump operating efficiency. 2. Instead of a furnace and air-conditioner, you might have a heat pump . 3. You can do this if the heat pump serves only your unit. 4. This process acts as a heat pump , transporting warm equatorial water North. 5. Standard ARI 870 ratings are intended for direct exchange ground-source heat pumps . 6. Note that the COP of a heat pump depends on its duty. 7. The expansion will be heated and cooled by a geothermal heat pump . 8. This, however, can actually reduce the efficiency of the heat pump . 9. Geothermal heat pump systems are more expensive initially than conventional systems. 10. The design of a heat pump has a considerable impact on its efficiency.