The entrance door in a passive house is a very important element, and only a high-quality, professionally installed product provides the desired insulation and air-tightness. Better door insulation is obtained if the door does not have any glass surfaces. If you opt for a door model with glass surfaces, a single pane is preferable to several small glass surfaces.
The windows and doors in a building’s thermal envelope must have a thermal transmittance of Uw ≤ 0.90 W/(m2K) according to the SIST EN 14351-1:2006+A2:2016 standard. They must be installed according to the principle of three-level sealing, as defined in the RAL guideline
You can read more about insulation in our blog article.