Principles of Passive House Construction

•Ultra-Low energy use
maximum of 4.75kBtu/sq. ft. per year for space heating or approximately 1.4 kWh per sq. ft. -leading to the humorous idea that a 1500 sq. ft. house could be heated with a simple hairdryer!
minimum R-44 insulation levels recommended for Northwest Mixed Temperate climate.
•Thermal Bridge-Free Construction
Structural framing often provides a shortcut for heat to escape. This must be analyzed and avoided through careful design.
•Air Tightness
must achieve maximum 0.6 air changes per hour at 50 Pascal pressure.
•High Performance Windows and Doors
Triple-glazed insulated windows with at least 50% Solar Heat Gain Coefficient.
•High Efficiency Heat Recovery Ventilation
Outgoing stale air passing through fins transfers free heat to incoming fresh air. HRV must be at least 75% efficient.
•Beautiful and User-Friendly