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Bob Ward Companies: Bel Air, MD
Summary for all technologies studied:
- Results for the Bob Ward Companies' Ultra-Effecient Home were focused on overall home energy efficiency success, and not on the performance of individual components and technologies used.
- The house saved over 13,000 kWh per year, compared to typically constructed homes in the area.
- The Photovoltaic (PV) electric system saved an additional 4000 kWh each year.
- See Details for information on the systems used to achieve the energy savings, including Advanced Framing techniques, Photovoltaic Systems, Solar Water Heating and Tankless Water Heater, Cross-linked Polyethylene (PEX) Plumbing, and others.
Energy Features |
Typical Regional |
Builder Standard |
Ultra-Efficient Home |
Floor R-Values |
R-19 |
R-30 |
R-30 |
Attic R-Values |
R-30 |
R-38 |
R-49 |
Wall R-Values |
R-13 |
R-13 |
R-20 |
Infiltration |
0.45 ACH |
0.35 ACH |
0.20 ACH |
Ventilation |
none |
none |
60 cfm, Passive with exhaust |
Cooling System |
13 SEER
56 kBtu/hour |
13 SEER
36 kBtu/hour |
19 SEER
36 kBtu/hour |
Heating System |
7.7 HSPF
61 kBtu/hour |
7.7 HSPF
42 kBtu/hour |
9.3 HSPF
36 kBtu/hour |
Duct System |
Conditioned Space |
Conditioned Space |
Conditioned Space |
Domestic Hot Water |
EF 0.86 |
EF 0.86 |
Solar - EF 0.98 |
Photovoltaics |
none |
none |
3850 Wdc |
Energy costs for this home, compared to typical Maryland construction:
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