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“A Passive House is a building, for which thermal comfort can be achieved solely by post-heating or post-cooling of the fresh air mass, which is required to achieve sufficient indoor air quality conditions – without the need for additional recirculation of air.” (Source: Passipedia)
So what exactly is a Passivhaus or Passive House? The Passivhaus design standard is a comprehensive low energy standard intended primarily for new buildings, so if you wish to build your residential or commercial property from scratch then this is by far the best ultra-low energy standard to adopt. The Passivhaus design standard is not restricted to just residential buildings. It can be used on various buildings such as offices, leisure facilities and schools. Passivhaus design can be applied to various construction methods such as a timber frame or using traditional masonry and concrete. It is important to note that Passivhaus design can be adapted and applied to suit your building needs and also satisfy local planning and conservation policy requirements.
EnerPHit is a standard developed by the Passivhaus Institute in Germany for refurbishments to existing buildings and this therefore makes it possible to apply Passivhaus certification to ultra-low energy retrofit projects. EnerPHit is a slightly relaxed standard for retrofit projects, where existing architectural and conservation requirements mean that meeting the normal Passivhaus design standard will not be feasible. The same key requirements as the Passivhaus standard will be required but the heating demand and air change targets are less stringent.