Passive house windows have energy efficient window frames with triple low-e glazing. To diminish heat transfer furthermore, there is an inert gas between the glass panels – argon, instead of air. Compared to a standard window frame [U = 1.5 ... 2 W/m²K], passive house windows reduce heat loss – in this particular example, windows have a U-value of between 0.79 … 0.86 W/m²K depending on their size, and the entrance door has a U-value of 1.07 W/m²K. The solar heat gain coefficient through the glazing [g] is 48%.