What is an Energy Efficient Window?
These windows do this by reducing heat loss, stopping draughts and reducing the transfer of cold from the outside. This is achieved through a combination of glazing, frame material and overall design.
Find Out More About Energy Efficient Windows
Anglian energy efficient windows help you save money on your heating bills and lower your carbon footprint. Our double glazed windows are A-rated as standard for energy efficiency, and our triple glazing is rated up to A++ with uPVC flush windows. Explore materials and styles to see how you could improve your home's energy performance.
How much does Double Glazing Cost?
Learning about the energy efficiency of windows helps you to make informed choices on ways to help lower your heating bills and carbon footprint.
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Energy Ratings Explained
Our guide to energy ratings cuts through the jargon to help you make better, informed decisions on your new windows.
Reasons to Choose Energy Efficient Windows
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Improve Thermal Efficiency
Our A-rated, A+ and A++ rated energy efficient windows improve thermal efficiency and helps keep your home warm. They make the most of solar energy and prevent warm air escaping. This helps you maintain a comfortable temperature in your home all year round.
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Reduce your Carbon Footprint
Energy efficient windows reduce the amount of energy you use. Your home loses less heat, meaning you use your heating less, lowering your energy consumption. Using less energy means you produce less CO2, and saves you money on bills too.
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Less Condensation
Condensation forms on windows when moist air meets cold glass. Spacer bars between the panes create a thermal break, preventing inner glass getting too cold. Low-E glass reflects heat back into your room, keeping inner panes warm in warm rooms. These features in our windows reduce the risk of condensation forming.
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Add Value to your Home
A low score on an Energy Performance Certificate could lower the chances of selling your house. A Government report on property sales found making energy saving improvements could increase the value of your home by 14-38%. Upgrading your windows can increase your score, lower your bills, and add value to your home.
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More Cost Effective
New windows often have higher window energy ratings than old ones. Replacing pre-2002 double glazing with our A-rated double glazing could save you £184.25 per year* on energy bills. uPVC A-rated windows are also more cost-effective compared with Aluminium and Wood, saving you money in the short and long term.
*Source Glass and Glazing Federation. † A typical detached house has 23.7m2 of windows. Based on replacing uPVC double glazed windows with a 12-14mm sealed unit and gas central heating with A-Rated thermally efficient windows.
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What Makes an Energy Efficient Window?
What Are the Most Energy Efficient Windows?
While modern windows all provide good energy efficient designs, some styles of window are more thermally efficient than others. Here are some of the most energy efficient window styles.
uPVC Flush Casement Windows
The flush casement style provides one of the most energy efficient uPVC window designs. uPVC is a great insulating material, and uPVC flush casement windows can be fitted with both double and triple glazing. With double glazing, our uPVC flush casement windows are rated A for energy efficiency, while triple glazing pushes them to the highest rating of A++.
Triple Glazed uPVC Casement Windows
Casement windows are the most popular type of uPVC window, providing A-rated energy efficiency as standard with double glazing. Only our uPVC windows can be fitted with triple glazing, making this style one of the best ways to achieve up to A++ energy efficiency rating. uPVC casement windows can be customised into many configurations, providing an ideal balance of cost and thermal efficiency.
Timber Flush Casement Windows
Wood is a natural insulator, and wooden windows perform better than you might think. Wooden flush casement windows with double glazing achieve an A-rating for energy efficiency, helping to keep your home comfortable throughout the year. Wood conducts less heat than metal and other materials, meaning it minimises the transfer of warmth from inside your home to the outside.
How Much Do Energy Efficient Windows Save?
The amount of money you could get off your energy bill right now is mounting up. The energy calculator developed by the Glass & Glazing Federation (GGF) shows the savings you could be seeing from new energy-efficient windows and doors.
As an example, here are the savings of a typical house upgrading from pre-2002 double glazed uPVC windows with gas heating to Anglian A-rated windows:
| Annual saving | £184.25 |
| 10-year saving | £1,842.50 |
Thermal imagery shows you could be throwing money out the window, quite literally. The intense red areas show heat escaping through the old windows and door before upgrading to our new thermally efficient ones. It's a simple way of showing the big reduction in red heat loss and a big improvement in heat retained.
Different Anglian windows have different energy ratings and savings, but also enhance the aesthetic of your home. Start transforming your home today and explore our wide range of window styles.
What’s the Difference: Energy Efficient Windows vs Regular Windows
Energy efficient windows are naturally more modern and more recently installed designs, while older windows tend to be less energy efficient. One of the main differences is the glass itself. Old windows may have less effective double glazing or even single glazing, which let in more draughts and are less effective at insulation.
Here’s a quick rundown of the basic elements that make a window energy efficient or not:
| Energy efficient window | Regular window |
|---|---|
| Double or triple glazing | Single glazing or outdated double glazing more than 20 years old |
| Modern uPVC, aluminium or timber frames | Older wooden frames with single glazing |
| Secure, padded seals and multi-point locking | Minimal seals and basic latches or non-locking handles |
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Energy Efficient Windows FAQs
Your Questions Answered By Us
How do energy efficient windows work?
Energy saving windows use either two (double glazed) or three (triple glazed) panes of glass. Our windows use two panes of Low E glass which reflect heat back into your home to reduce heat loss. In triple glazing, a pane of Low Iron glass sits between the Low E panes, designed to let more of the sun's energy into a room. Both double and triple glazing have argon gas and thermal spacer bars between each pane, to minimise heat transfer between the glass, and help reduce moisture and draughts.
Do new windows help with energy efficiency?
New energy efficient windows can significantly help increase your home’s energy efficiency. They often have higher energy ratings than older double glazed windows. Our windows carry British Fenestration Rating Council (BFRC) window energy ratings. Ratings range from A++ to G, with A++ windows being the best. Nearly all Anglian windows are A-rated with double glazing and up to A++ rated for triple glazing with Flush uPVC. Upgrading your windows to the best energy efficient windows will keep your home warm, lower your energy bills and increase your home’s overall energy rating.
How important is window insulation?
If your windows are not well insulated, you may it takes longer and costs more money to heat your home. Poor insulation may also make your home more difficult to cool down in the summer. Investing in better window insulation is one of the most effective ways of preventing cold air from entering your home and stopping heat from escaping, saving you money on your energy bills and to keep you feeling warm and comfortable all year round.
How much difference do energy efficient windows make?
How much difference energy efficient windows make, depends on how high their energy rating is. They can help you save on your heating bills, how much depends on other factors like the size and type of home you have. They can help you maintain the warmth of your home in winter months, and how much heat your windows let in during summer months. They can also help you use less energy, reducing your carbon footprint. Replacing your old double glazing with double glazing with an A+ energy rating could help you reduce your carbon usage by 140kg per year*.
*Source Glass and Glazing Federation. † A typical detached house has 23.7m2 of windows. Based on replacing uPVC double glazed windows with a 12-14mm sealed unit and gas central heating with A+-Rated thermally efficient windows.
What’s the average cost to install energy efficient windows?
The average cost of installing energy efficient windows will depend on several factors, including the size and design of the window you choose, along with the choice of materials and style of glazing. This can mean greatly varying costs between projects and properties. To get an accurate cost for replacement windows in your home, get in touch with Anglian for a free, no-obligation quote.
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Our Accreditations and Licenses
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The British Board of Agrement provides certification on the quality of our products. -
Anglian’s PVC-U Casement and Tilt & Turn windows have enhanced security performance. -
The British Fenestration Ratings Council is the UK’s national system for rating energy efficient windows. -
The Fenestration Self-Assessment Scheme ensures window installers comply with buildings regulations in England & Wales. -
Look for our FSC® certified wooden window and door products on our website. -
Anglian is a leading member of the Glass and Glazing Federation (GGF). -
PVC Industry initiative to improve manufacturing, minimise emissions and develop recycling practices -
TrustMark is a government endorsed not-for-profit organisation that operates through more than 30 scheme operators.