Double Glass vs Triple Glass, Which one is better?


Glazed windows possess a gap between their glass panes that creates an insulating barrier separating the indoors from the outdoors. This gap is filled with air which is a poor conductor, reducing the amount of heat loss through the window. For better insulation, an inert gas such as argon or krypton is used in most modern double and triple glazing.

Two glass panes are always better than one, but are three glass panes better than two or unnecessary?

This article will take you through various factors like heat gain, insulation, and light transmission which would help you decide which glass pane is the perfect choice for your home. Let’s start with understanding both, double glazing and triple glazing individually. This double glazing vs triple glazing comparison would help you know their pros and cons. 

As the name suggests, there is a very obvious difference between double and triple glazing. Double glazing, having two panes, has a single gap whereas triple glazing has three panes of glass, thus creating two gas-filled gaps instead of one. This additional glass pane and the gap increases the efficiency of the window’s heat and noise insulation compared to double glazing. 

But due to the above-mentioned point, don’t be so sure that triple glazing is the best and ultimate solution. There’s much more to it.

What would be the potential difference between double glazing and triple glazing is one of the most popular questions amongst the people who are more likely to ask when building or renovating a home. Till now, double glazing was an apt choice for many homeowners based on its several benefits such as a high level of insulation keeping your home warmer.

On the other hand, Triple glazing is considered a more exciting option. Triple glazed windows have three times better insulation and energy efficiency as compared to single glazed windows. It’s also beneficial in getting rid of cold spots in your house. Thus it is more expensive than double glazing.

For choosing ideal glazing, you need to understand the unique features of both glazing options and compare their pros and cons.

Thermal efficiency 

Heat loss is considerably reduced while using triple glazing because that additional pane is insulated and has a remarkable U value compared to double glazing. Moreover, low emissive glass is used in triple-glazed windows that are provided with an amazing coating to keep your house safer from the summer heat. This is a major difference between double and triple glazing windows that you should always keep in mind while buying an ideal pane unit for your apartment.

Enhanced comfort 

Triple glazed windows are an improvised version of glazed windows thus creating an enhanced comfort level throughout the space. They play a crucial role in maintaining stable temperature levels in the house, thus making them better as compared to double glazing. In addition, triple glazing allows higher levels of humidity and lower condensation levels. It helps to keep your homes warmer thus better for colder places. Thus you need to choose the ideal ones based on the prevailing weather conditions in your area.

Weight and Performance

If you reside in a chaotic neighborhood and need some peace, you should opt for triple glazing as they are heavy and assure better acoustic properties. On the other hand, double glazing has a lighter weight and thus they are unable to provide the best noise protection within the house.


Triple glazing also provides higher levels of protection. This is achieved through the double coating for lower emissions, low iron glass on the exterior side, a warm edge technology spacer of the panes, high-quality internal glazing bead, and the well-sealed panes that avoid not only noise but also cold air from entering your house. The strong additional pane in triple glazing makes it difficult for the thieves to break into the house thus creating a safer place.


Triple glazing is made from more glass as compared to double glazed, therefore they allow a little amount of light. Thus there are possibilities that your house may be less illuminated during cold or monsoon seasons.

Cost comparison 

Triple glazing windows are costly and their installation costs are also higher as compared to double glazed units. Thus also keep in mind their affordability.

Make a choice, double or triple glass?

Firstly, let’s compare the main futures for the double and triple glass: 

Comparing Double GlassTriple Glass
U-ValueCan be as low as 1.0 W/m2KCan be as low as 0.6 W/m2K with double low-e coating
Acoustic performanceFor higher acoustic performance can be provided with laminated double glassProvide higher acoustic performance thans standard double glass
Weight Depending on glass thickness: 4mm double glass weighs 20 kg/m2 and 6mm weighs 30 kg/m2Havier than double glass, this may cause the higher cost for windows and installation
Surfaces for coatingLess surfaces available More surfaces available for additional low-e coatings
Cost Cost effectiveMore expensive 

Benefits of triple-glazing

  • Efficient heat loss reduction thus cutting your energy bills.
  • Retains more heat, keeping your home warmer.
    Low condensation levels between window panes.
  • Efficient acoustic insulation
  • The window gap filled with inert gas acts as extra insulation.
  • Durable thus a longer lifespan. 
  • Provide enhanced security with a multi-locking system, toughened glass, and is difficult to break. 

While comparing double glazing vs. triple glazing, it is important to note that double glazing also possesses its benefits:

  • Energy-efficient.
  • Lightweight and flexible thus easy and cheap installation costs.
  • Flexible and adaptable to any style 
  • The modern double glazing also provides noise insulation and enhanced security.

Which one did you Choose?

As discussed, both have their own sets of advantages and disadvantages. So it might be confusing for you to choose one, but as noted, it also depends on the type of climate in your area and affordability is also an important concern. Thus while selecting your glazing, choose wisely, keeping in mind all these points.