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Building Energy Efficient Homes: New Construction and Rehab HERS 86 (EnergyStar) minimum 30% Better Than the M.E.C. Other Considerations: Affordable; Durable; Healthy William Zoeller, R.A. Major Systems Affecting Building Energy Performance Building Envelope

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building energy efficient homes new construction and rehab

Building Energy Efficient Homes:New Construction and Rehab

HERS 86 (EnergyStar) minimum

30% Better Than the M.E.C.

Other Considerations:

Affordable; Durable; Healthy

William Zoeller, R.A.

major systems affecting building energy performance
Major Systems Affecting Building Energy Performance
  • Building Envelope
    • Air-tightness, Insulation levels
    • Water-management
  • Windows and Glazing Systems
    • Glazing SHGC
    • Overall “U” Value
  • Heating, Ventilation, and Air Conditioning
    • Equipment sizing, efficiency and location
    • Duct tightness, distribution effectiveness, and location
major systems affecting building energy performance3
Major Systems Affecting Building Energy Performance
  • Domestic Hot Water
    • Generation
    • Distribution
    • Stand-by-losses
  • Appliances
    • Refrigerator, dishwasher, clothes washer/dryer
  • Lighting and miscellaneous
panelized advanced framing
Panelized Advanced Framing
  • Panelized Advanced Framing 2 x 6 Walls @24” OC
  • Low-e Windows
  • Foamed Stud Cavities with Blown in Cellulose (R-23)
  • Inside-The Envelope AHU
  • Foamed and Insulation Buried Ducts
  • Affordable and Starter Homes
  • HERS 89

Outlook ConstructionAtlanta, GA

Panelized Advanced Framing
  • Reduces Framing Cost and increases Level of insulation
  • Reduces on-Site Labor and Construction Time
  • Requires Additional Planning, But Improves Systems Integration
insulation buried ducts
Insulation-Buried Ducts

Computer Modeling of Heat Flow

From Insulation Buried Duct

Section Through Foamed Over Insulation Buried Duct

Buried Duct Benefits
    • Improves air distribution efficiency
    • Provides additional air-sealing at joints and registers
    • Reduces Peak load allowing a smaller system to be used
    • Cost of foam can be offset by reduced cost of HVAC
panelized wall and roof systems
  • 25 Home In-fill Development
  • Panelized SIP Construction
    • R-24 Walls
    • R-40 Roofs
  • 92 AFUE Furnaces
  • Mastic Sealed Ducts
  • 1.2-kW PV Solar Systems
  • Low-e Windows
  • EnergyStar Appliances
  • Compact Fluorescent Lighting
  • Controlled Ventilation

Claretian AssociatesSouth Chicago, Il


First SIP Project in Chicago

  • $155,000 cost for 1700 SF Home
  • 5% Increase in Cost of Standard Construction
  • 50% Increase in Energy Efficiency
panelized wall and roof systems10
Cement Board Structural-Insulated-Panels

Aluminum-Skinned SIP Roof Construction

Structural-Steel Moment-Frame at Centerline

Sold as Pre-Engineered Kit to Builder

Standard and Custom Designs Available

Low-Cost and Durable

Panelized Wall and Roof Systems

Homefront Homes


Cement Board SIP Panels

Panelized Wall Construction System:

  • Hardie®5/16” thick cement board laminated to both sides
  • of 4” thick polystyrene foam
  • Cuts construction time by up to 75%
  • High minimum R values with R-20 walls and R-30 roof
  • No wood used in the home construction to avoid moisture
  • and termite damage

3 days to complete the building shell

home front
Home Front

Before Hurricane

After Hurricane

Home Front homes proved exceptionally resilient when Hurricane Charley struck in August, 2004

One mile away….

unvented crawlspace
Unvented Crawlspace
  • Improved Energy Efficiency
  • Improved Indoor-Air-Quality
low e glass windows
Low-e Glass Windows
  • Low-e glass blocks out most long-wave radiation (heat) while allowing most of the short-wave radiation (light) to enter.
typical costs
Typical Costs
  • Extra cost for 300 SF low-e coating on double glazing: $300.
  • Savings in downsizing AC by ½ ton: $275.
    • Net cost: $25.
additional benefits of low e windows
Additional Benefits of Low-e Windows
  • Reduced cooling load needs smaller HVAC system
  • Smaller HVAC system means lower air-flows, and simpler pressure balancing
  • By being more closely matched to both peak and non-peak cooling loads better dehumidification is achieved
    • (Improves IAQ and inhibits mold growth)
hvac optimization
HVAC Optimization
  • “Right-Sized” HVAC
    • Manual J with no oversize
  • Compact design
    • avoids ducts in outside walls
    • Less opportunity for leaks and losses
    • Less costly to install
    • Better able to achieve air-flows


  • Mercedes Homes Townhouses
  • Melbourne, Florida
  • Concrete and Panelized Construction
  • Low-e windows
  • Integrated HVAC
  • AHU in Conditioned-space
  • EnergyStar Qualified
down sized hvac
Down-Sized HVAC

Single Zone 1.5 Ton Capacity Heatpumps

Compact Distribution

First and Second Floor Returns

Fresh-Air Duct

tankless gas water heater
ECO-Block Walls

Fly-Ash Concrete

Low-e Windows

Integrated Compact HVAC


Tankless Water-Heater and Hydro-coil AHU


Tankless Gas Water-Heater

Madera I Model Home, Gainesville, Florida

Takagi T-KD20

cost and benefits
Cost and Benefits
  • Saves Space: Much smaller than a storage tank
  • Saves Energy: Stand-by losses are eliminated. Operating efficiency improves by 30% to 40%
  • Saves Energy: For space heating, .84 AFUE is higher than standard furnace at .80 AFUE
  • Incremental cost increase is about $600. Very short initial pay-back, and immediate positive cash flow.
heat pump water heater
Heat Pump Water Heater
  • Installed in a home in Melbourne, Florida
  • WatterSaver Integrated HPWH by ECR International, Inc. (product introduced Fall 2002)
  • Monitoring began in April 2002
  • 3-person household (2 adults & toddler)
preliminary findings
Preliminary Findings
  • Reliable Performance
  • Homeowners very pleased
  • 62% kWh savings
  • $10/month savings at local electric rates of $.077/kWh
takoma village washington d c
Takoma VillageWashington, D.C.
  • Other Sustainable Features
    • Energy Efficient Lighting
    • Low-VOC Paints and Finishes
    • Fiber-Cement Siding
    • Recycled-Content Carpets
    • Horizontal-Axis Clothes Washer
    • Tubular Skylights
putting it all together
Putting It All Together

Warwick Grove,

Warwick, NY

putting it all together28
Putting It All Together
  • Advanced Framing
  • Unvented Crawlspace
  • Low-E Windows
  • Optimized HVAC
    • 92% Condensing Furnace
    • 13 SEER Air-Conditioning
  • Tankless Gas Water-Heater
  • EnergyStar Appliances
  • HERS 89 -90!