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Introduction to Heat Pumps - Problem Set 3.3

Source(s) or Contributor(s)
Pacific Northwest National Laboratory
Question
  1. Chris is considering replacing his natural gas boiler with a multi-zone ductless heat pump system. The boiler has an efficiency of 70% and the ductless mini-split has an HSPF of 11.5. Chris uses 1,000 therms per year and pays $0.66 per therm and $0.11 per kWh. How much would it cost to run each system and will Chris save money by installing the new system? Why else might he install the new system?