Windows
Windows are an essential factor in assuring pleasant indoor conditions. In cold climates, poorly insulated windows will cause relatively cold surfaces at the facade and will require active heating near the windows to compensate for cold air drops, draughts and “cold radiation” caused by the cold surfaces.
Highly insulated windows, on the other hand, will make an active contribution to increasing the level of comfort. High performance windows, specifically developed to meet the requirements of Passive Houses, are offered by an increasing number of manufactureres across the globe. A list of PHI Certified Passive House windows can be found here.
This section contains information on the following topics:
Simplified calculation for window installations
Passive House windows - requirements 
Thermal bridges of transparent components – Installation thermal bridges
Types of glazing and their specific values
Window installation (read also in Spanish)
The next generation of Passive House windows
Passive House - 6 reasons why you still need opening windows
Optimization of roller shutters and exterior blinds
PHI window certification: previous success and new climate zones
Is it problematic if the window is better than the wall?
Windows in step-by-step retrofits - windows first, then insulation
Windows in step-by-step modernisations – First the thermal insulation, then the windows