When building or renovating a house, it is important to consider not only aesthetics but also the technical performance of materials. One of the most important aspects is how well they prevent heat from escaping.
This applies not only to wall or roof insulation but also to windows.
In Stalowa Wola, a wide range of windows and doors is offered by PROFIL DOM, which also supplies shutters and garage doors. One of the key parameters when choosing windows is the heat transfer coefficient.
What Does It Mean?
The heat transfer coefficient (Uw) indicates how much heat escapes through a window. It is expressed in W/(m²·K).
The lower the value, the better the insulation and the lower the energy loss.
This parameter consists of:
Ug – glazing unit (the glass package)
Uf – frame and sash (the window profile)
Uw – the entire window construction, including the connection between glass and frame
Thanks to this value, different windows can be easily compared in terms of energy efficiency.
Since When Do the New Regulations Apply?
Thermal insulation requirements were gradually tightened over the years. The biggest change came in 2021, when the Technical Conditions 2021 (WT 2021) came into force.
According to these regulations, windows in new buildings must achieve:
Uw ≤ 0.9 W/(m²·K)
Why Is It Important?
Windows significantly influence how much energy is needed to heat a building. If they are poorly insulated or leaky, a large amount of heat can escape through them.
This results in higher heating bills and lower comfort. That is why manufacturers and building regulations now strongly emphasize low Uw values. Good windows are an investment not only in aesthetics but also in long-term savings and comfort.