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Knauf Residence Please login or register to view address information
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This 1970s house was updated with a 2.2 kW solar electric array, geothermal heating and cooling, and rainwater collection system. The main bathroom was fitted with a Caroma Sydney dual-flush toilet and water was further budgeted through the use of an evapo-transpiration sensor for irrigation.
System Components
- 2.2 kW solar PV system with 12 Mitsubishi MF180 panels
- Fronius grid-tied invertor
- 4-ton Waterfurnace geothermal heat pump with 180-foot-deep vertical well field and desuperheater to provide domestic hot water
Additional Measures- All Energy Star appliances
- Low-flow, dual-flush toilet
- Electric clothes dryer with exhaust plumbed to HVAC to provide humidity during dry winter months
- Rotary clothes-drying line for summer use
- Compact fluorescent, LED, and dimmable incandescent lighting
- 2,400-gallon rainwater collection system
- South-facing, drought-tolerant plantings and runoff-reducing landscaping
- Intelligent irrigation system with evapo-transpiration sensor for watering only when needed
- Pair of Swedish Blue ducks, replacing bi-annual petrochemical pesticide applications to garden
- 100% organic horse manure, replacing periodic hydrocarbon-derived chemical fertilizer
- 1990 Honda CRX HF getting 53 mpg, and also a bicycle, replacing a 2001 Volvo V-70 that maybe once got 28 mpg on the highway
Craig Tarr, Energy Concepts
System Engineer: Craig Tarr, Energy Concepts
System Installer: Craig Tarr, Energy Concepts
Date of Installation Completion: October 2007
System Cost, Payback, and Financial Incentives Utilized$21,000 minus $2,000 federal tax credit, $4,000 state rebate, $4,000 Great River Energy rebate. Final cost: $11,000.
2,350 kWh (design change, module location moved)
37%
