Passive House Requirements

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Passive House requirements are based on a set of rigorous energy efficiency and performance standards developed by the Passive House Institute. These requirements aim to achieve a high level of energy efficiency, thermal comfort, and indoor air quality. While the specific requirements may vary slightly depending on the region and climate, the following are the fundamental principles and performance criteria typically associated with Passive House certification:

  1. Space Heating and Cooling Demand: The space heating and cooling demand in a Passive House must not exceed 15 kWh/m² per year (or 10 W/m² peak demand). This is achieved through a combination of high levels of insulation, airtight construction, and minimizing thermal bridging.

  2. Total Energy Demand: The total primary energy demand for all purposes, including heating, cooling, hot water, and appliances, must not exceed 120 kWh/m² per year. This limit promotes overall energy efficiency in the building's operations.

  3. Airtightness: Passive Houses require a high level of airtightness to minimize air leakage and ensure the effectiveness of insulation. The maximum allowable air changes per hour at 50 Pascals (ACH50) is typically set at 0.6 ACH, or 0.05 cubic feet per minute per square foot of envelope area (cfm/ft²).

  4. Thermal Comfort: Passive Houses prioritize thermal comfort for occupants. The indoor temperature should not exceed 25°C (77°F) for more than 10% of the year, and the indoor temperature should not fall below 17°C (63°F) for more than 10% of the year.

  5. Indoor Air Quality: Passive Houses emphasize good indoor air quality through mechanical ventilation with heat recovery. The ventilation system must provide a constant supply of fresh air while recovering heat from the exhaust air to minimize energy loss.

  6. Solar Heat Gain: Passive House design maximizes the use of passive solar techniques to optimize heat gain from the sun. The primary windows' solar heat gain coefficient (SHGC) should be carefully considered to balance solar heat gain with the risk of overheating.

  7. Quality Assurance: To achieve Passive House certification, the building must undergo rigorous quality assurance processes. This includes conducting blower door tests to measure airtightness, ensuring compliance with the performance criteria, and verifying the energy efficiency calculations.

It's important to note that while certification is not mandatory to achieve a Passive House design, it provides a recognized standard for verifying the performance and quality of a building. These requirements serve as guidelines for designers, architects, and builders to create energy-efficient, comfortable, and sustainable buildings.

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