Up to 30% savings on heating costs
How do we measure the energy efficiency of windows?
The energy efficiency of windows is measured with the temperature loss index (Uw ). Put simply, the lower the Uw value, the more energy-efficient the window.
Here are the Uw values for Jelovica’s energy-efficient wooden windows:
Uw = 0.76 W/m2K – Jeloline 92
Uw = 0.76 W/m2K – Newline 94
Uw = 0.80 W/m2K – Ekoline 78/94
Uw = 0.86 W/m2K – Newline 84
Uw = 0.86 W/m2K – Jeloline 78
Uw = 0.90 W/m2K – Ekoline 68/84
Uw = 1.20 W/m2K – Jeloline 68
For comparison, the ratings of thermal loss indices for energy-inefficient windows are as follows:
Uw = 2.5 W/m2K – windows from 1980
Uw = 3.5 W/m2K – windows from 1956
Uw = 4.5 W/m2K – windows from 1937
Glazing significantly affects the energy efficiency of windows
The choice of glazing is directly related to the energy efficiency we want to achieve with windows. The thermal insulation of glazing depends on the number of panes and special coatings on them, the width of the space between panes and the type of gas between the panes.
Better window glazing provides better thermal insulation, allowing for savings due to increased energy efficiency. The lower the thermal transmittance of the glass, the more energy-efficient the glazing.
When should we opt for double-glazed windows…
Double-glazed windows are primarily chosen by customers who want to replace old windows, but want to invest minimal funds in the renovation of windows. At the same time, the installation of double-glazed windows is a good solution when the building has significant thermal losses through the wall assembly and roof.
Also, keep in mind that if you decide for double-glazed windows, you are not entitled to a non-repayable Eco Fund subsidy.
And when for triple-glazed windows?
Triple glazing offers the best thermal insulation for your home and significantly increases energy efficiency. It is recommended for low-energy buildings, passive houses and all constructions where good window insulation can contribute to the overall energy efficiency of the building.
When investing in triple-glazed wooden or wooden-aluminium windows, you are entitled to a non-repayable Eco Fund subsidy.
What about installation?
The thermal insulation of windows also depends on proper installation. For example, if we install highly insulating windows that have poor sealing due to improper installation, we have not achieved much. Therefore, if you want to achieve the declared properties of window energy efficiency, consider the RAL installation system, which is the highest-quality method of installation.
Window installation according to the RAL system
When installing windows according to RAL guidelines, gaps are sealed according to the”tighter on the inside than on the outside” system. The sealing is three-level, consisting of an inner vapor barrier, an outer vapor diffusion barrier and a central thermal and sound insulation. Installation according to RAL guidelines prevents the formation of thermal bridges (e.g., the formation of mould), ensures a comfortable climate in the room and provides excellent sound protection between the window and the structure.
Jelovica has received a quality mark in construction for the installation of building joinery. The mark confirms that our RAL installation of building joinery is not only in accordance with the required guidelines, but at an exceptionally high level – higher than is required by otherwise mandatory certificates.
Traditional window installation
A great option for customers who want to thermally insulate their home, but are primarily guided by price. Also, traditional installation is an optimal choice when thermal bridges across the entire building (poor insulation of the wall assembly and roof) prevent a higher-quality RAL installation from ensuring significantly higher savings.
Jelovica experts are happy to help
We are available to you at our sales and service points throughout Slovenia, at info@jelovica.si or on the toll-free phone number 080 23 23.