ENERGY STAR Qualified Homes

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BEST OF BUILDING SCIENCE.COM MAY 3, 2007

• ENERGY STAR Qualified Homes
• New Spec
• What, Why, and
• Where Headed?

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WHAT, WHY, AND WHERE HEADED?

• What?

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WHAT IS ENERGY STAR?

• The national, US government-backed symbol for
• cost-effective
• energy efficiency
• while assuring same or better performance

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GROWING BRAND TO PROTECT

• ENERGY STAR
• 60 awareness in 2004
• 70 households would recommend
• 95 likely to buy again in future

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WHAT IS ENERGY STAR FOR HOMES?

• Voluntary
• Truly Energy Efficient
• Builder RecognitionGovernment-Backed
  LabelThird-Party VerifiedAwards

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WHAT WAS THE OLD SPEC?
HERS 86 and 15 gt code, or equivalent package
Effective Insulation Levels
Efficient Windows
Efficient Equipment

Tight Ducts, Tested
Build it Tight, Tested
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RESULTS 700,000 HOMES
Homes Labeled

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RESULTS MARKET PENETRATION
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ENERGY STAR FOR HOMES METRICS

• 700,000 Labeled Homes Cum.
• gt25 Markets gt20 Penetration
• 3,500 Builder Partners
• 60 100 Largest Builders

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WHAT IS THE NEW SPEC? PERFORMANCE PATH

• HERS Index Threshold
• 80 in North
• 85 in South
• Note
• Exceptions are CA, OR, WA, HA and Manufactured
  Housing

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NEW SPEC PERFORMANCE PATH REQTS.

• Insulation inspection for full R-value
• Thermal Bypass Inspection Checklist
• Right-sized cooling equipment
• Leakage lt 6 cfm to outdoors/100 sq. ft.
• Min. 1 ENERGY STAR Product category
• No on-site power generation trade-off
• Max. 20 screw-in CLF light sockets
• Programmable thermostats with heat pumps must
  have Adaptive Recovery

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NEW SPECPRESCRIPTIVE PATH
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NEW SPEC FOCUSTHERMAL ENCLOSURES THAT WORK

• Gaps
• Voids
• Compression
• Incomplete Air Barrier
• Misalignment with Air Barrier
• Wind Intrusion

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WHAT, WHY, AND WHERE HEADED?

• Why Focus on Thermal Enclosure?

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WHY THERMAL ENCLOSURE FOCUS?

• HoustonWe have a problem.

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THERMAL BYPASS CHECKLIST 1. INSULATION ALIGNMENT
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THERMAL BYPASS CHECKLIST 7. DUCT/PIPING
PENETRATIONS
Courtesy of Advanced Energy
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WHY IS IT CHANGING?RETURN CAVITY AIR LEAKAGE
Courtesy of Fort Collins Utilities
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THERMAL BYPASS CHECKLIST 10. DROPPED CEILINGS
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THERMAL BYPASS CHECKLIST 9. ATTIC EAVES
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WHY CUSTOMER SATISFACTION

• AEC Study
• 7,000 homes (1998 and 2004)
• 3,300 baseline (est. 20 gt MEC 93)
• 3,000 ENERGY STAR Qualified Homes
• 800 Guaranteed Performance Homes

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2 x 6 24 o.c.
Guar. Perform.
ENERGY STAR
Energy Savings Compared to Baseline
Source Measuring Public Benefit from Energy
Efficient Homes 2005, Advanced Energy Corp.
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THERMAL BYPASS PRINCIPLE
Insulation
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THERMAL BYPASS IN ACTION
30o F
50o F
70o F
70o F
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WHAT THERMAL BYPASS LOOKS LIKE
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INSULATION ALIGNMENT
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INSULATION ALIGNMENT
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INSULATION ALIGNMENT
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1. OVERALL AIR BARRIER/THERMAL BARRIER ALIGNMENT
BAND JOIST PROBLEM
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1. OVERALL AIR BARRIER/THERMAL BARRIER ALIGNMENT
BAND JOIST BEST PRACTICES
Spray Foam Band Joist
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1. OVERALL AIR BARRIER/THERMAL BARRIER ALIGNMENT
BAND JOIST BEST PRACTICES
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EXTERIOR WALL CZ 1-3 ALTERNATE
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EXTERIOR WALL CZ 1-3 ALTERNATE
Grade 1 Insulation Fully Supported
Air-tight exterior air barrier
B-3
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SHOWER/TUB EXTERIOR WALL
Courtesy of Building Science Corp.
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SHOWER/TUB EXTERIOR WALL
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INSULATED FLOOR OVER GARAGE
Improper insulation! It must touch the surface
it is intended to insulate
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ATTIC KNEE WALLS
Hot Wall
Courtesy of Building Science Corp.
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ATTIC ACCESS PANEL/STAIRS
Images courtesy of Energy Services Group
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ATTIC ACCESS STAIRS
Right
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CANTILEVERED FLOOR
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CANTILEVERED FLOOR
Courtesy of Fort Collins Utilities
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DUCT/PIPING PENETRATIONS
Airtight foam on pervious rock wool will not
work.
Courtesy of Advanced Energy Corporation
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DUCT/PIPING PENETRATIONS
Courtesy of Advanced Energy
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FLUE SHAFT
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FLUE SHAFT
TIP Specially colored fire-rated foam now
available for sealing difficult air gaps at flue
openings
Courtesy of Building Science Corp.
Image courtesy of EnergyLogic
Image courtesy of EnergyLogic
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ATTIC EAVES
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ATTIC EAVES
Baffles at every bay
Image courtesy of MaGrann Associates
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DROPPED CEILINGS
Courtesy of Building Science Corp.
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DROPPED CEILINGS
Courtesy of Building Science Corp.
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FIREPLACE SHAFT WALL
Courtesy of EnergyLogic
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FIREPLACE SHAFT WALL
Courtesy of Building Science Corp.
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RECESSED LIGHTING
Courtesy of Energy Services Group
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RECESSED LIGHTING
Eliminate this air leakage by locating fixtures
inside the insulated envelope or using insulated
can, air-tight (ICAT) recessed fixtures.
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PORCH ROOF
Courtesy of Energy Services Group
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PORCH ROOF
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COMMON WALLS
Courtesy of Energy Services Group
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COMMON WALLS
Courtesy of Energy Services Group
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COST-EFFECTIVE
Monthly Annual Utility Savings
40 480 Added Mortgage 15
180 Cost Savings 25 300 1,000s for
typical ownership period

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ASSURING BETTER PERFORMANCE

• Unless youre prepared to break the laws of
  physics, energy efficiency delivers
• Lower Utility Cost
• More Comfort
• More Durability
• Improved Indoor Air Quality
• Protect Environment

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WHY CHANGE SPEC?

• Ensure
• greater energy efficiency than standard
• performance advantage
• in other words, protect the brand!

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WHY, HOW, AND WHERE HEADED?

• Where Headed?

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ENERGY STAR INDOOR AIR PACKAGE
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NEXT LOW-HANGING FRUIT

• Solar Orientation
• Thermal Bridging
• Compact Ducts Inside Conditioned Space
• Efficient Water Heating/Distribution
• Efficient Lighting and Appliances
• Engineered Comfort Systems
• Highly Efficient Equipment
• Not-So-Big Homes

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SOLAR ORIENTATION SAVINGS
Single-Family
Multi-Family
Source Evaluation Measurement and Verification
of California ENERGY STAR Homes Strategic
Research Evaluation ENERGY STAR for Homes
Utility Stakeholder Meeting April 26-27, 2007
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FUTURE ISSUE THERMAL BRIDGING
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FUTURE ISSUE THERMAL BRIDGING
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FUTURE ISSUE THERMAL BRIDGING
Courtesy of Building Science Corp.
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FUTURE ISSUE THERMAL BRIDGING
Courtesy of Building Science Corp.
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FUTURE ISSUE THERMAL BRIDGING
uninsulated corner
uninsulated wall intersection
No/Badly Installed Insulation
Uninsulated corners and walls in typical framed
home added up to a large thermal hole!
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FUTURE ISSUE THERMAL BRIDGING
48 wall corners and intersections 12 feet
uninsulated wall!
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CORNER FRAMING
Courtesy of Building Science Corp.
Courtesy of Southface Institute
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WALL INTERSECTION FRAMING
Ladder T Allows insulation in exterior wall
cavity at wall intersections
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INSULATED CONCRETE FORMS (ICFs)
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STRUCTURAL INSULATED PANELS (SIPs)
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WHY COST-EFFECTIVENESS
13.9
13.7
9.6
4 SIP
2 x 4 16 o.c.
2 x 6 24 o.c.
Whole Wall R-Value, ORNL Testing
Tests show that under common worst case
installation practices, 2x6 drops to R-11
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5. ATTIC/CEILING INTERFACE DROPPED CEILINGS
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5. ATTIC/CEILING INTERFACE DROPPED CEILINGS
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THE SCIENCE BEHIND HOME PERFORMANCE DUCT INSIDE
CONDITIONED SPACE
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THE SCIENCE BEHIND HOME PERFORMANCE COMPACT
DUCTS INSIDE COND. SPACE
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5. ATTIC/CEILING INTERFACE DROPPED CEILINGS
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5. ATTIC/CEILING INTERFACE DROPPED CEILINGS
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ENGINEERED COMFORT SYSTEMS

• Right-Sized Equipment (ACCA Manuals J/S)
• Engineered Duct Layout (ACCA Manual D)
• Register Design (ACCA Manual T)
• Duct Sealing/Testing
• Refrigerant Charge
• Air Flow Across Coil
• Air Flow Balance
• Gas Equipment On Rate/Combustion Venting
• Dehumidification in Hot/Humid Climates

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ADVANCED LIGHTING
100 Watts
26 Watts
100 Electricity
100 Electricity
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QUESTION FOR BUILDERS

• Are your customers willing to pay less for
  advanced technology lighting with
• 75 lower energy costs
• 80 less un-wanted heat
• 1000 less nuisance replacing bulbs
• that meets or exceed all expectations?

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WHY EFFICIENT LIGHTING? WHOLE-HOUSE DESIGN
BATHROOMS
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WHY EFFICIENT LIGHTING? WHOLE-HOUSE DESIGN
CLOSETS
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AFTER OPTIMIZED EFFICIENCY

• Renewable Energy Systems
• Passive Solar
• Solar Hot Water Heating
• Active Solar Heating/Cooling
• Renewable Generation (PV, Wind)
• Biomass Fuels

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END GAME CARBON NEUTRAL HOME

• Offset Remaining Energy Loads
• Green Energy from Local Utility
• Green/White Tags
• Carbon Offset Certificates
• Planting Trees

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WHERE HEADED ROADMAP
Stage One IECC 2006
Stage Two ENERGY STAR Qualified Home
Start
Stage Three Optimized Energy Efficiency
Stage Four Renewable Energy Systems
Stage Five Secure Carbon Offsets
Finish
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ANSWER...

• It wasnt raining when Noah built the Ark.
• Howard Duff

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HOW TO GET MORE INFORMATION

• On the Web at
• http//www.energystar.gov/homes