Rehabilitation of windows
Improving the thermal insulation of a window is one of the most economical ways to minimize heat losses from a house in winter or heat gains that occur in summer. The changes in thermal insulation must be made before the improvements that are proposed in the air conditioning systems. This will reduce the energy demand that the air conditioning systems must cover, thereby achieving economic, energy and CO2 emission savings. Constructions under the Passivhaus standard always place special emphasis on the enclosures used in the construction.
To compare different alternatives to improve the thermal insulation of a window, the thermal transmittance value, the solar factor and the air permeability class are used.
Replacing windows and doors can have a significant impact on winter heat losses and summer solar gains in a building. There is also a big impact from reducing outdoor air infiltration losses by minimizing drafts.