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Costs and Payback for Net-Zero
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Energy Efficient Design
Comparison of PV Systems
R-Value of Cellular Shades
Energy Codes for Windows
Solar PV Raw Data
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Related Links

Links to Sites about Building Science and Conservation:
Building Science Corp.
Green Building Advisor
Home Energy Magazine
Green Building Talk
Passive House Institute - US
Passivhaus Institut (Germany)
LEED (Leadership in Energy and Environmental Design
Energy Star
Building Green
Sustainable Sources
Insulated Concrete Forms Association
Structural Insulated Panels Association
National Renewable Energy Laboratory
Residential and Commercial Energy Building Codes for U.S. 

Links to Sites about Home Instrumentation:
Instrumenting Home for Energy Use - NLCPR

Methodology for Computing Source Energy:
Source energy calculations

Solar Photovoltaic Energy in Colorado
Colorado Solar

Financing for Energy Efficient Homes
Home Intelligence
Green Mortgages

Computer Models for Home Energy Calculations (free):
REScheck to verify compliance with energy codes
RESFEN to compute window effects on home energy consumption
PVWATTS V2 to compute solar PV output energy
ORNL whole wall R-value calculator
Whole house heat loss calculator (from Build it Solar)
Whole house heat loss calculator (from Taco)
Building energy software tools directory
Comparison of home energy modeling software