Passive House Design
A rigorous energy standard that cuts heating and cooling demand through the building shell.
Quick Answer
Passive House is a rigorous voluntary building energy standard that dramatically reduces heating and cooling demand. It relies on continuous superinsulation, airtight construction, high-performance windows, thermal-bridge-free detailing, and balanced ventilation with heat recovery. Buildings are verified against performance targets, and certification is offered by Passive House Institute and Phius.
The Full Picture
Passive House focuses on the building shell first. By insulating heavily, sealing air leaks, and using high-performance windows, a building needs so little heating and cooling that small systems can handle the rest. A mechanical ventilation system with heat recovery supplies fresh air while recovering most of the energy from the outgoing air.
The standard was developed in Germany in the 1990s, with Dr. Wolfgang Feist and the Passivhaus Institut (PHI) in Darmstadt among its pioneers. In the United States, Phius (Passive House Institute US) offers a climate-specific standard, while PHI also certifies projects internationally. Both require verification, including modeling with specialized energy software and on-site airtightness testing.
Five principles are commonly cited: continuous insulation, airtightness, high-performance windows and doors, thermal bridge-free design, and heat or energy recovery ventilation. Orientation and solar gain are also tuned to the climate. Detailing at junctions such as slab edges, window installations, and balconies matters a great deal.
For builders, Passive House raises execution demands. Air barrier continuity, careful window installation, and quality control are important, and testing during construction catches problems early. Passive House projects often cost somewhat more up front, but the premium varies widely by project, region, and team experience, and lower energy use can offset part of it over time.
Real Examples
Common Misconceptions
People assume: Passive House means no mechanical systems.
Actually: The name refers to passive measures like insulation and airtightness, but buildings still use ventilation and small heating and cooling systems.
People assume: Passive House buildings need sealed windows that never open.
Actually: Occupants can open windows. The ventilation system supplies fresh air continuously, and operable windows are a common feature.
Frequently Asked Questions
What is the difference between Passive House and Passivhaus?
Passivhaus is the German name. Passive House is the English translation. The Passive House Institute (PHI) maintains the original standard, while Phius runs a separate climate-specific U.S. standard.
Is Passive House certification mandatory?
No. It is voluntary, although some jurisdictions and incentive programs encourage or reference it.
How is airtightness verified?
A blower-door test pressurizes and depressurizes the building to measure air leakage. Passive House sets strict maximum leakage targets.
Does Passive House cost more?
It often adds some first cost for better windows, insulation, and ventilation, but the premium varies widely and tends to shrink as teams gain experience.