1. Challenges & Opportunities of
Whole-House Energy Retrofits
Hawthorne House
2011 IBS
Saturday, January 15
8:00 – 9:30 am

2. Project & Climate
 John Wesley Miller Companies
 Tucson, AZ
 Hot-mixed Dry
 Climate Zone 2
 Hawthorne House
 Built in 1961
 1,990 square feet
 4 bedrooms, 2 baths
 Unoccupied “gut-rehab”

3. Goals
 Project Goals:
 Durability
 Energy Efficiency
 Green
 Accessibility
 Technological Innovation
. . . a high performance home.

4. Whole-House Optimization
 Optimize Energy & Green
 Climate Considerations
 Whole-house Analysis
 1. Envelope
 2. Systems
 3. Renewables
 Building Materials
 Local materials
 Durability
 Performance
 Cost

5. Optimized Envelope
 Over original adobe walls
 1 ½” exterior insulation (R-10)
 Attached using z-strips
 Finished with 3-coat stucco
 Remove roofing & install
 2” R-13 polyiso rigid insulation
 3-ply built-up roof
 Painted reflective white

6. Optimized Envelope
 Replace windows
 Dual-pane low-e, argon
 U-value: 0.31, SHGC: 0.30
 Air Seal
 Carefully sealed
 Tested by TEP
 New Garage
 Detached

7. Optimized Systems
 High Efficiency Space Heating &
Cooling
 Air to Air Heat Pump
 Dual Compressor 19/17.6 SEER
 Tested duct leakage (not exceeding 5%
of air handler flow)
 Mechanical Ventilation
 Central exhaust fan
 Fresh air to central return

8. Optimized Systems & Renewables
 Solar Hot Water Preheat System
 Integrated collector storage (ICS)
solar preheat
 Electric tankless backup water
heater
 Solar Electric PV System
 1.6 kW (DC) PV System

9. Costs

10. Programs & Incentives
 Building America
 Tucson Electric Power’s (TEP’s) Guarantee program
 5 year heating/cooling & comfort
 Tucson Sustainable Energy Standard
 Local & State Tax Incentives
 Awards
 EnergyValue Housing Award
 Southern Arizona HBA’s Builder of the Year
 Arizona’s Innovation Award

11. Quality Assurance & Testing
 TEP Third-Party Guarantee Program
Testing
 Framing
 Insulation Installation
 Air Sealing Testing
 Window Verification
 Ducts
 HVAC
 Lighting

12. Integrated Marketing
 Messaging  Third Party Certification
 Energy Efficiency  Energy
 Green  Quality
 Solar
 Incentives  Awards
 Local & Utility
 State
 Federal

13. Photos?

14. Armory Park del Sol (APdS)
 John Wesley Miller Companies
 Tucson, AZ
 Hot-mixed Dry
 Climate Zone 2
 14 Acre, 99 lot redevelopment
 88 homes
 Used APdS specs in Hawthorne
House

15. What is the right question?
 Dedication
 Whole-House Energy
Efficiency
 Quality Management
 Incentives
 Correlation of water & energy
savings
 “Boy Scout” approach to
energy & green building
programs

16. Resources
 John Wesley Miller Companies
 http://johnwesleymillercompanies.com/hawthornehouse.html
 BA Best Practices
 http://apps1.eere.energy.gov/buildings/publications/pdfs/building
_america/ba_cs_retrofit_john_wesley_miller.pdf
 NAHB Research Center
 Corporate: www.nahbrc.com
 Technical: www.toolbase.org

17. Questions?
This concludes The American Institute of Architects
Continuing Education Systems Program
Amber Wood
Manager, Energy Programs
301-430-6309
awood@nahbrc.com