Triple Glazing, Solar Control and Thermal Efficiency: How Glass Can Impact Your Home’s Temperature

When it comes to choosing your glazing, there is more to consider than increasing the natural light in your home or maximising your views.

Ensuring you choose energy-efficient glass is crucial for maintaining regulated temperatures and comfortable living in every season. Not only this, but as energy prices continue to rise and climate change causes extreme temperatures, investing in triple glazing is crucial for lowering your energy costs in the long run.

First, we break down the basics of triple glazing vs double glazing to inform you on the key differences, then we apply this to your proposed home renovation.

Triple Glazed Windows: Maximum Insulation for Year-Round Comfort

Triple glazing offers superior insulation and heat retention, along with excellent soundproofing. This consists of three individual panes of glass separated by thermal spacer bars, and the gaps between these panes are filled with an inert gas – argon being the industry standard. However, Westbury triple glazed windows are filled with krypton gas, which is a poorer thermal conductor than argon gas, resulting in even less heat transfer! Our triple glazed windows have a U-Value of 1.1.

What is a U-Value?

U-Values are a measurement that calculates the heat loss through your glazing. The lower the U-Value, the better the glass insulates, preventing heat from escaping your home. Lower values signify improved energy efficiency, resulting in lower heating bills and a more comfortable, temperature-regulated home. For context, single glazing U-Values are around 4.8 to 5.8, whereas UK building regulations require a U-Value below 1.4.

Double Glazed Windows

Most commonly used in British new builds are double glazed windows. Similarly to triple glazing, these consist of glass panes separated by an inert gas – however, double glazing only contains two panes.

Westbury’s double glazing is toughened as standard, and we use argon gas between the panes. Our frame thickness is also deeper than typical timber windows, which allows for a wider gap between the two panes and subsequently improving insulation even more so! This results in a U-Value of 1.4, which complies with UK building regulations and offers great thermal performance and home comfort.

How Do Double Glazed Windows Reduce Heat Loss?

The gap between the panes of glass prevents warm air from leaking through the window, the insulating gas acting as a barrier. Heat that passes through the first pane cannot circulate efficiently in the gap, and the gas conducts and retains that heat.

Triple glazing provides an additional layer of protection against heat loss, as the extra gap makes it even more difficult for warm air to escape. What little heat makes it through double glazing would hit yet another barrier of insulating gas.

Double Glazing vs Triple Glazing

Triple glazing is a higher-performing option than double glazing. Below, we compare the key differences between the two, helping you understand the advantages and disadvantages of triple glazing clearly. This breakdown helps homeowners evaluate the best triple glazed windows UK options based on performance and budget.

This breakdown helps homeowners evaluate the best triple glazed windows UK options based on performance and budget.

Solar Control Glass and Heat Control Glass: Keeping Summer Heat at Bay

Coated glass is one of the most efficient ways to reduce heat transmission in your home, retain internal heat, and prevent extreme high or low temperatures. Below, we outline the two most common types of coating and why they would be beneficial to you.       

Low-E Glass

‘Low emissivity’ coated glass is standard in all new builds and adds an extra layer of protection against the winter chill. The coating does this by reflecting radiant heat back inside the property, reducing the amount of heat escaping through the glass. This is best for homes that are north-facing, where defense against harsh summer heat isn’t typically required.

Solar Control Glass

Solar control glass, or as we call it, SunGuard, is a coating that reflects solar heat away from the property. This is best for south-facing homes, roof lanterns or orangeries with large amounts of glazing, and prevents extreme temperatures in the warmer months. SunGuard is more expensive than Low-E and can be applied to both double glazed windows and triple glazed windows.

Only one coating can be applied to your glazing, so it’s important to make an informed decision based on how its benefits apply to the individual needs of you and your family. This choice also matters if you are comparing double glazed windows and triple glazing, weighing up any advantages and disadvantages of triple glazing to find the best triple glazed windows UK solution for your home.

How Energy Efficient Glass Impacts Bills and Indoor Comfort

Energy-efficient glass options can help lower household bills, a major concern for many households amid rising energy costs. As of October 2025, the energy price cap has increased by 2%, leading to a significant increase for many households.

Previously implemented help schemes, such as the Energy Price Guarantee that limited this increase in bills, have since ended, and more than ever homeowners are looking to reduce costs wherever possible.

Triple glazing performs best in terms of thermal efficiency. Retaining your central heating means that you will be able to reduce the length of time your heating is on, getting the most out of your heating and a better value for your money. This is one of the key advantages when comparing triple glazing vs double glazing.

Switching to triple glazing, solar control glass or low-E glass is more than just an upgrade – it’s a smart investment in personal comfort, sustainability and long-term savings. High-performance glass isn’t a luxury, it’s a great way to transform your property into a comfortable and efficient modern home.

Choosing between double glazed windows and triple glazed windows depends on performance needs, budget and whether any disadvantages of triple glazing (such as cost or bulkiness) apply to your project.

Conclusion

It’s essential to consider precisely what matters to you and your family – budget, performance, and temperature control are all individual factors. Perhaps your property is south-facing and you experience heightened temperatures in the warmer months, then you know that SunGuard is the right upgrade for you. Or, you might experience cold winters and your old double glazed windows aren’t performing as well as you’d like, and therefore you ensure that your roof lantern is made with triple-glazing and a Low-E coating for maximum heat retention.

This is often where homeowners compare triple glazing vs double glazing and weigh up any potential disadvantages of tripleglazing before choosing the best triple glazed windows UK option for their needs.

Get a quote from us today using our free online quote builder, or call us for more personalised advice to help you plan your roof lantern renovation.