Economic Feasibility Assessment:

• Boulder, CO has a climate that required analysis for only the heating season

• Indoor temperature of 67-72 degrees F

• Horizontal loops 12 feet underground  (20% propylene glycol solution)

• Pump and Compressor in a single unit (ClimateMaster Tranquility 27-038)

•  Pump COP = 3.5

• Compressor COP = 5

• Results

o   Pipe length = 660 feet

o   Geothermal Start-up costs = $6500

o   Furnace Start-up costs = $3000

o   Yearly savings using Geo = $140

o   Payback time = 25 years (best case)

•  Not exactly feasible for home size/location

• Wind energy could potentially aid geothermal on this site