The Passivhaus (Passive House) standard is a fabric first approach to the low energy building model. It refers to a modern ultra-high efficiency construction standard overseen by the Passivhaus Institute in Germany. The standard mandates very high levels of thermal resistance, very low air transported heat loss and exceptionally high performing windows. The standard uses a specific selection of techniques including the removal of thermal bridging, heat recovery ventilation, and highly specified, triple glazed windows.
The term “Passivhaus Window” generally refers to ultra efficient triple glazing and window profile, which combined provide a maximum whole window U value (Uw) of 0.8 W/m2K.
Today, the Passivhaus window standard has identified the importance glazing can make in reducing space heating requirement and in turn reducing energy demands in buildings. The Passivhaus standard recognises that any more than a 4°C temperature differential (UK), between the surface temperature of the inner pane of glass and the ambient temperature in a room will create down drafts, originating from the surface of the glass then pooling on the floor in front of the window as the cold air falls, this cold air then flows in the form of a draft across the floor. Preventing these down drafts and cold air currents from forming is imperative for a house to maintain temperature with a greatly reduced percentage of space heating. By using triple glazed windows with 2 panes of Low Emissivity glass, like our ClimaGuard A+ or our ClimaGuard A 1.0, you can achieve centre pane U values as low a 0.4 W/m2K, which when combined with the Passivhaus building standard, can facilitate up to 75% reduction in space heating greatly reducing demands on energy and financial costs with soaring energy bills. Unlike walls, windows can also provide some positive heat gains, allowing heat from the sun to enter the building and assist in the reduction of space heating.
These kinds of glazing advancements mean that our buildings can provide optimum efficiency and minimum cost for years to come, saving energy and reducing energy bills. For more information on the Passivhaus window standard visit