Passive house

History

The term passive house was used in the 1970s for buildings emphasizing passive solar strategies; since the 1990s it denotes meeting the quantified PHI certification criteria (space conditioning, primary energy, airtightness and comfort requirements). The standard originated from a 1988 discussion between Bo Adamson (Lund University) and Wolfgang Feist (then at the Institute for Housing and Environment, Darmstadt), followed by research supported by the state of Hesse.

North American “superinsulation” pioneers of the 1970s (e.g., the Saskatchewan Conservation House and the Leger House) provided important technical precursors, including heat-recovery ventilation and airtightness testing.

First examples

Four terraced houses in Darmstadt-Kranichstein (1990–1991) are widely cited as the first built to what became the Passive House standard.

Further implementation

The Passivhaus-Institut (PHI) was founded in 1996 in Darmstadt to develop, promote and certify to the standard. By 2010 an estimated 25,000+ Passive House buildings existed worldwide.{{cite news |first=Elisabeth

The concept has since been demonstrated at scale. Gaobeidian, China, hosts what is reported as the world’s largest Passive House development (Railway City), with several hundred thousand m² of certified area built in phases since 2019. The world’s tallest certified Passive House building is the 88 m Bolueta tower in Bilbao, Spain (2018).

In the United States, Katrin Klingenberg’s 2003 “Smith House” (Urbana, IL) catalyzed a movement that led to the creation of PHIUS (2007). PHIUS has since certified hundreds of projects; New York City’s Park Avenue Green (2019) was recognized as North America’s largest Passive House affordable housing project at the time.

In the UK health sector, the Passivhaus-certified Foleshill Health Centre (Coventry, opened 2021) demonstrated substantial energy savings in operation and a replicable delivery model for NHS facilities.

Standards

While techniques such as superinsulation predate the standard, Passive House (PHI) specifies quantitative performance criteria and quality assurance. Key requirements include (abridged):

• Annual space heating (and, in suitable climates, cooling) demand ≤ 15 kWh/m2/a or peak heat load ≤ 10 W/m2, calculated with the PHPP using local climate data.
• Airtightness: n50 ≤ 0.6 h⁻¹ at ±50 Pa (blower-door test).
• Efficient mechanical ventilation with heat recovery (typically ≥75% sensible efficiency).
• Whole-building primary energy/renewable energy limits as defined by PHI (see PHI documentation).

Standards in the US: PHI vs. PHIUS+

Two related but distinct standards operate in North America:

• PHI (Darmstadt): the original international Passive House standard and certification system using PHPP and PHI quality assurance.
• PHIUS+ (Chicago): climate-specific performance targets (CORE/ZERO/REVIVE families) with on-site QA/QC by accredited raters and verifiers; criteria are optimized for carbon and cost within each North American climate zone. The two programs use different energy models and protocols and certify independently.

Construction costs

Upfront costs vary by market, building type and experience of the delivery team. Reported premiums have ranged from ~5–10% in Germany, the UK and the US (with reductions as supply chains mature), partially offset by downsized or eliminated conventional heating/cooling systems and lower operating costs. Delivery at parity with standard code buildings has been demonstrated in some German multifamily projects (e.g., Vauban, Freiburg). High-latitude locations (60°N) can face higher envelopes and glazing costs to meet targets.

Design and construction

Core practices include:

• Passive solar design and urban/landscape integration – compact massing, appropriate solar gains, shading, and mitigation of overheating; strategies are adapted to climate, especially in hot-humid regions.
• Superinsulation and thermal-bridge-free detailing (typical opaque U-values ~0.10–0.15 W/m²·K).
• High-performance windows (triple/quad glazing, low-e coatings, inert-gas fills, warm-edge spacers; whole-window U-values often ≤0.80 W/m²·K).
• Airtightness to n50 ≤0.6 h⁻¹, verified by blower-door testing; intermediate tests during construction are recommended.
• Balanced mechanical ventilation with heat recovery (typically ≥75% efficiency) for IAQ and energy recovery; earth-tubes may be used with careful moisture control where appropriate.
• Low-load space conditioning – many climates allow heating via tempered ventilation air with small duct heaters or heat-pump coils; peak loads are limited by envelope performance.

Performance and occupant behaviour

Concerns are sometimes raised that occupants must restrict behaviours (e.g., opening windows), but sensitivity analyses indicate performance is generally robust to typical occupant variation.

International comparisons

• United States – Space-heating intensity around 1 BTU/ft2 per heating degree day is typical for PHI Passive House, compared to ~5–15 for code-built homes (2003 MEE Code), representing 75–95% savings. Waldsee BioHaus (Minnesota) follows the German standard and reported ~85% lower energy use than comparable LEED homes.
• United Kingdom – New houses to Passive House standard used ~77% less space-heating energy than homes built under circa-2006 Building Regulations.
• Ireland – Typical Passive House dwellings consumed ~85% less space-heating energy and cut related CO₂ by ~94% versus 2002 Regulations baselines.

References

References

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