When choosing new PVC windows, it is not always necessary to automatically select the most expensive option. Although triple glazing is very popular in Estonia’s climate, double glazing can still be a practical and cost-effective solution in many situations.
Let’s look at how double glazing works, its main advantages, and where it makes the most sense.
What Is Double Glazing?
A double-glazed unit consists of two panes of glass separated by a sealed space. This space is usually filled with air or an insulating gas such as argon.
Modern energy-efficient units may also use Low-E glass. Its special coating helps reduce heat transfer through the glass and improves the window’s thermal performance.
Double glazing has a simpler construction and is lighter than triple glazing.
Advantages of Double Glazing
One of its main advantages is lower cost. If many windows need to be replaced or you are glazing an area where maximum energy efficiency is unnecessary, the difference in price can be significant.
Another advantage is lower weight. This can be particularly useful for large window structures, balconies, terraces, and frequently opened window sections.
A good modern double-glazed unit can provide effective thermal and sound insulation and is perfectly adequate for many applications.
Where Is Double Glazing Most Suitable?
Double glazing is particularly worth considering for areas that are not continuously heated or where maximum thermal insulation is not required:
- Balconies and loggias
- Terraces
- Summer houses
- Garages
- Storage rooms
- Outbuildings
- Seasonally used spaces
- Other lightly heated areas
Double glazing can also be suitable for residential spaces when the building and its intended use do not require maximum thermal performance.
Is Double Glazing Suitable for Estonian Winters?
Yes, but the characteristics of the building and how the room is used should be considered.
Modern double glazing performs considerably better than simple glazing systems used decades ago. However, in a permanently heated living space, triple glazing will generally provide better thermal insulation.
During particularly cold winter weather, the difference may also be noticeable in the temperature of the interior glass surface. Triple glazing generally keeps the inner pane warmer and can therefore improve comfort near large windows.
Double or Triple Glazing?
The right choice mainly depends on where the window will be installed.
Double glazing is a good option when lower cost, lighter weight, and adequate insulation are priorities.
Triple glazing is generally preferable for year-round heated living spaces where maximum energy efficiency and comfort are important.
Neither option is universally better. The glazing should be selected according to the requirements of the particular room and building.
Does Double Glazing Reduce Outside Noise?
Yes, although the number of panes alone does not determine sound insulation.
Noise reduction is also affected by:
- Glass thickness
- Distance between the panes
- Use of panes with different thicknesses
- Window profile
- Seals
- Installation quality
If traffic or other outside noise is a major concern, mention this when ordering your windows. A glazing unit specifically designed for acoustic insulation can perform significantly better than a standard unit.
Can Condensation Form on Double Glazing?
Yes. Condensation occurs when humid indoor air comes into contact with a sufficiently cold surface.
During very cold weather, the interior surface of double glazing may be cooler than that of triple glazing, potentially increasing the likelihood of condensation under certain conditions.
However, condensation also depends heavily on indoor humidity, temperature, and ventilation. Poor ventilation can cause condensation even on high-quality triple-glazed windows.
The Whole Window Matters
A common mistake when comparing windows is to focus only on the number of glass panes.
Actual window performance depends on the complete system: the PVC profile, glazing unit, hardware, seals, and especially the quality of installation.
A poorly installed expensive window can cause more problems than a simpler window installed correctly.
Conclusion
Double glazing is not an outdated or inferior solution. It is more affordable, lighter, and perfectly adequate for many applications.
It is particularly suitable for balconies, terraces, summer houses, garages, and other spaces where maximum thermal insulation is not essential.
For a permanently heated apartment or private house, however, it is worth comparing double and triple glazing while considering not only the initial purchase price but also long-term energy efficiency and comfort.
The best solution is not necessarily the most expensive one – the right glazing is the one that matches the needs of the building and the room.