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Buildings consume:
• 39% of total energy
• 71% of electricity
• 53% of natural gas
(primary)
Why Are We Interested in Low Energy Homes?
-2-
Market
-4-
Geos Neighborhood
Gilligan Family LP Property
Cro
ke C
anal
69th Ave.
Indi
ana
Str
eet
Master Plan
Geos Incorporates Multiple Home Types for a Diversity of Needs
Home Types Home Sizes
Row Homes 1,100 – 1,800sf
Single Family 1,800 – 2,000sf
Paired Homes 1,600 – 1,800sf
Live/Work Units 1,600 – 2,000sf
Condominiums 600 – 1,600sf
Co-Housing 800 – 1,600sf
Vision
-5-
• Comparative development patterns in Highland neighborhood (urban Denver)
• Optimizing density with solar access designed (required) for entire neighborhood and individual lots
• Utilizing unique features of Colorado’s climate
• Taking advantage of 300 sunny days per year: open homes for winter sun, shade against summer heat
Passive solar: optimal orientation created with master plan
Technology
-8-
• High performance shell – high insulation, low infiltration
• Heat Recovery Ventilator – fresh air intake and energy conservation
• Passive solar orientation – sun is primary source of conditioning heat
• Solar thermal collectors – for domestic hot water and back-up conditioning heat
• Solar photovoltaic – achieves net zero energy goal
Geos Utilizes Demonstrated and Cost-Effective Designs
Technology
-9-
5 kW photovoltaic R-50 roof
R-22 ICF basement walls
R-5 tuned fiberglass windows
R-30 walls
Less than 1 Air Change per 20 Hours( < 0.05 NACH)
Energy Model: 1,700sf Paired Home
Technology
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Geo-Assisted Heat Recovery Ventilation (HRV) System
• Provides constant filtered fresh air
• Temperature equalization in all rooms
• Heating/cooling distribution
• Low maintenance
• Very low noise
Technology
-11-
Passive Solar30%
High Performance Shell40%
HRV - 10%
Ground Source Heat Pump
20%
Total Reduction 100%
Natural GasEarth Loop Cooling & Building Shell - 15%
Energy Star Appliances - 5%
Monitoring - 5%
Photovoltaic Solar Offset65%
Total Reduction 100%
Electricity
Goes Objective: Build Net Zero Energy Homes... Now!• Energy Consumption Reduction
Efficient Lighting10%
Technology
-14-
$45,000 incremental
improvements
$285 incremental
monthly mortgage
$200 saved energy costs
$85 tax savings
=
Incremental monthly cash flows of Geos improvements
GEOS Design: Net-Zero Energy Homes That Are Cash Flow Neutral• Reduced utility payments offset increased mortgage costs
Economics
-15-