Challenges & Opportunities of Whole-House Energy Retrofits

Hawthorne House

2011 IBSSaturday, January 15

8:00 – 9:30 am

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”

Goals

Project Goals: Durability Energy Efficiency Green Accessibility Technological Innovation

. . . a high performance home.

Optimize Energy & Green Climate Considerations Whole-house Analysis 1. Envelope 2. Systems 3. Renewables

Building Materials Local materials Durability Performance Cost

Whole-House Optimization

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

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

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

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

Optimized Systems & Renewables

Costs

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

Quality Assurance & Testing

Testing Framing Insulation Installation Air Sealing Testing Window Verification Ducts HVAC Lighting

TEP Third-Party Guarantee Program

Integrated Marketing

Messaging Energy Efficiency Green Solar

Incentives Local & Utility State Federal

Third Party Certification Energy Quality

Awards

Photos?

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

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

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

This concludes The American Institute of Architects Continuing Education Systems Program

Amber Wood

Manager, Energy Programs301-430-6309awood@nahbrc.com

Questions?