Passive House (Passivhaus)
A building standard that slashes heating and cooling demand through envelope performance.
Quick Answer
Passive House, or Passivhaus, is a building performance standard that cuts heating and cooling energy demand dramatically through a very airtight, well-insulated envelope, high-performance windows, thermal-bridge-free detailing, and mechanical ventilation with heat recovery. Buildings are verified against measurable limits, so certification depends on modeled and tested performance.
The Full Picture
The Passive House concept originated in Germany and is associated with the Passivhaus Institut. In the United States, the Passive House Institute US (PHIUS) offers its own standard adapted to North American climates, while other bodies certify to the Passivhaus Institut's criteria. The two paths use different targets, so teams should confirm which one a project follows.
The approach prioritizes the building envelope. Continuous insulation, careful detailing to limit thermal bridges, high-performance windows, and strict airtightness reduce heat loss and gain. A mechanical ventilation system with heat or energy recovery supplies fresh air while retaining much of the conditioning energy, which keeps indoor comfort stable.
Compliance is performance-based. Designers use energy modeling software specific to the standard, and an airtightness test of the completed building is required, with limits set by the program. Certification is granted after review of the modeling and construction documentation by an accredited certifier.
The work is detail-intensive for builders. Air barrier continuity, window installation, and coordination between trades determine whether the airtightness target is met, so many teams run blower-door tests during construction rather than waiting until the end. Passive House can apply to housing, offices, schools, and other building types.
Real Examples
Common Misconceptions
People assume: Passive House means a building has no mechanical systems.
Actually: The name refers to passive strategies reducing demand, but buildings still use mechanical ventilation, usually with heat recovery, plus modest heating and cooling.
People assume: Passivhaus and PHIUS are identical.
Actually: They are related but separate certifying bodies with their own criteria and climate adaptations, so the target standard should be confirmed.
Frequently Asked Questions
What is the difference between Passivhaus and PHIUS?
Passivhaus certification follows criteria from the Passivhaus Institut. PHIUS is a US organization with its own standard tuned to North American climates and building types.
Does a Passive House need an airtightness test?
Yes. Certification involves a measured airtightness test, with limits set by the certifying program.
Is Passive House only for homes?
No. It has been applied to multifamily housing, offices, schools, and other building types.
What are the core principles?
Continuous insulation, airtight construction, high-performance windows, thermal-bridge-free design, and ventilation with heat recovery.
Is it a building code?
No. It is a voluntary standard, although some jurisdictions offer incentives or reference it in policy.