What is a Passive House?
Passive Houses are houses that require a minimum amount of energy to heat and run. It is a building standard that is energy efficient, comfortable, and ecological at the same time.
The definition of a ‘Passive House’ as determined by the Passive House Institute (PHI), a Germany-based independent research institute that has played an especially crucial role in the development of the Passive House, is as follows:
- Maximum annual primary energy requirement of 120kWh per square metre (domestic hot water, heating and auxiliary electricity): 120kWh/(m2a)
- Maximum annual space heating requirement of 15kWh per square metre: 15kWh/(m2a)
- Minimum airtightness of 0.6 air changes per hour measured at a pressure of 50 Pascal: n50 0.6 1/h
- Optimal heat load of 10 W per square metre: 10W/m2
To obtain Passive House Certifications you need to achieve the first three items outlined. To heat your home by way of a mechanical ventilation system you will need to achieve the Optimal Heat load.