With the UK cost-of-living crisis ongoing, you may think this is not the time to make home improvements.
However, if your windows aren’t energy-efficient, you could pay out far more than you need each month on your heating bills.
At Manchester Window Factory, we’re experts in energy-efficient glazing and frames. With 25+ years of experience under our belts, we’re ideally placed to offer you the advice you seek.
In this blog, we will explain more about energy-efficient windows and how they can help you reduce your heating bills and carbon footprint.
What are energy-efficient windows?
Energy-efficient windows are created to provide better insulation and help lower your carbon footprint and heating bills.
They have been designed and tested to ensure they offer high levels of installation and ventilation. To be energy efficient, a window must offer excellent thermal (heat) retention while allowing for proper airflow to improve indoor air quality (IAQ).
Energy efficiency is measured with an A-rating from A++ to E, and energy-efficient windows will also carry a U-value. The lower the U-value, the more energy-efficient the window.
To achieve these ratings, every part of the window – the glass, frame, seals and locks – is assessed.
Energy-efficient windows perform better across these ratings than your typical window.
U-factor and R-value
The U-value of a window generally falls between 0.20 and 1.20, and the lower the U-value the better insulation the window provides. A window with a low U-value will have a high R-value, as this measures heat resistance rather than heat transfer. A good R-value is greater than R-5.
How do they work?
Every aspect of the window is engineered for energy efficiency. The materials for the frame must effectively stop heat from passing through. Timber is an excellent natural insulator, but modern UPVC and aluminium frames are also energy efficient.
The amount of air that can escape through the edge of the window must be minimal, reduced by airtight seals and expert installation.
The glass must retain heat while preventing harmful UV rays from penetrating. Double glazing and triple glazing both improve heat retention but for the most energy-efficient windows, you should look at Low-E glass.
Types of energy-efficient windows
Double or triple-glazed
Double and triple glazing are energy-efficient glazing options. Single glazing is not energy efficient as a single pane of glass is not a good insulator. Double and triple-glazed windows have two or three panes of glass respectively, with gaps between the panes filled with an inert gas, typically argon. Usually, triple glazing is more energy efficient than double but, for some people, the difference is not always enough to justify the extra cost. However, it depends on any coatings applied to the glass, the size of the gaps between the panes, and the gas they are filled with.
Low-E Coatings
Low emissivity (Low-E) glass is double or triple-glazing with a thin metal oxide coating. Almost invisible to the naked eye, this coating absorbs sunlight and reflects heat into the home without significantly reducing the flow of natural light.
Planitherm Triple Glazing
At Manchester Window Factory, we offer Planitherm triple glazing, a highly energy-efficient, kind of triple-glazed window with a special coating. Planitherm gives you all the security and noise-reducing benefits of triple glazing, with an added level of energy efficiency.
Secondary glazing
If you are looking to upgrade your single glazing on a budget, secondary glazing could be a good option. As the name suggests, a second pane of glass is fitted to your window, leaving a gap between 100mm – 200mm thick to approximate double glazing without the expense and inconvenience. Secondary glazing will improve your windows’ energy efficiency, reduce condensation and increase security. Plus you never need planning permission for secondary glazing, even in listed buildings and conservation areas.
Curtains, Blinds, & Shutters
Another cost-effective way to increase insulation and reduce heating bills is to hang curtains, blinds or shutters. There are many variations to suit your taste and they offer an extra layer of warmth. Carpets and rugs also have to reduce the heat lost from the floor, improving your home’s overall energy efficiency.
| Feature | Double-Glazed Windows | Triple-Glazed Windows | Low-E Windows | Gas-Filled Windows |
|---|---|---|---|---|
| Number of Glass Layers | 2 | 3 | 2 or 3 | 2 or 3 |
| Thermal Performance | Moderate | High | High | Very High |
| Sound Insulation | Moderate | High | Moderate | High |
| Cost | ££ | £££ | ££-£££ | |
| Energy Savings | 20%-30% reduction in heating | 30%-50% reduction in heating | 25%-40% reduction in heating | 30%-50% reduction in heating |
| Durability | Good | Excellent | Good | Excellent |
| Environmental Impact | Moderate (Less insulating gas)/td> | High | High (Reflects radiant heat) | High (Argon or Krypton-filled) |
| Best Use Case | Homes in temperate climates | Cold climates that require more heat | Homes with direct sunlight exposure | Extreme climates (hot or cold) |
The Benefits of Energy-Efficient Windows
There are many benefits of energy-efficient windows, for you, your health and the environment.
Reduce the amount of heat lost to the outside
The main aim of energy-efficient windows is to reduce the amount of heat lost to the outside. As discussed, the frame, glass and seals work together to stop warm air from escaping through the window and cold air getting in. This means your rooms stay warmer for longer, with no draughts and a consistently pleasant temperature.
Cost savings on energy bills
An estimated 26% of heat loss in the home comes from windows. By installing energy-efficient windows, you can reduce this heat loss, keeping your home at a comfortable temperature for longer. Since heat is no longer escaping through your windows, you shouldn’t need to put the heating on as often or for as long. The Energy Savings Trust estimates you could save around £140 a year with double-glazed A+-rated windows, or up to £150 a year with A++-rated double-glazed windows.
Environmental benefits
Less heat escaping from your home also means you are responsible for fewer carbon emissions entering the atmosphere. According to the Energy Savings Trust, A+-rated energy-efficient windows could reduce the average home’s carbon emissions by 380kg a year. A++-rated double-glazed windows could save 420kg of carbon dioxide from entering the earth’s atmosphere.
Energy-efficient windows also tend to be made from sustainably sourced/recyclable materials.
Improved comfort and health
A room that stays warm longer is more comfortable than a drafty one, but that’s not the only benefit of energy-efficient windows. These windows are also designed to offer better temperature control, so your home also doesn’t overheat during the summer.
No drafts mean you are less likely to catch a chill. Improved indoor air quality lessens your risk of developing respiratory issues, allergies, and other health problems. Finally, a comfortable temperature improves your mood and mental health.
Reduce condensation
Energy-efficient windows may also reduce condensation on the inside of the glass. Condensation on the inside of your windows can cause dampness, mould and mildew. Besides being unsightly, these issues can exacerbate existing health conditions such as asthma and be detrimental to you and your family’s overall health and well-being.
You may find condensation on the outside of your new energy-efficient windows, but this should disappear on its own and should not cause you any problems.
Frame materials
Most window frames are made of aluminium, uPVC or timber. All three are excellent insulators. Timber typically requires more maintenance than uPVC and aluminium but is often treated to improve its weather resistance and durability.
Let’s Talk About Costs and Savings
Replacing all the windows in your home with A+-rated energy-efficient windows may cost you around £15,000 including materials, labour and installation.
However, with savings of up to £150 a year on your energy bills, plus all the other benefits associated with this type of window, the windows could effectively ‘pay for themselves’ well before your guarantee expires.
Making the Switch to Energy-Efficient Windows
We understand that replacing all your windows with more energy-efficient alternatives is a big undertaking, not to mention expensive, so here are a few steps you can take to make the process less painful.
Steps to take to replace your old windows with energy-efficient ones
1. Do you Need Planning Permission?
In most cases, you shouldn’t need planning permission to replace your windows. However, you should check with your local authority if:
- You live in a listed building
- You live in a conservation area
- There is an Article 4 direction on your property which removes your permitted development rights
2. Assess your Existing Windows
Before you go ahead with any renovations, you should check the condition of your current windows. If they are already relatively new double-glazed units, it may not be worth upgrading to triple-glazing. However, you may still benefit from Planitherm glass or another option.
3. Set a Budget
Research prices and installation costs in your area then set a budget incorporating all the associated costs:
- Materials
- Labour/installation
- Disposal of old windows
- Maintenance costs, such as cleaning and repairs.
Installation costs can increase in certain areas of the UK. You also need to factor in an increase if the windows are hard to access.
4. Start with the areas of the home which need it most
Although it would be best to have energy-efficient windows in all rooms in your home, that may not be a viable option, depending on your budget.
If this is the case, repair or replace any damaged windows. Then look at which rooms you use most and which would benefit most from energy-efficient windows. You can always replace more windows when your budget allows.
5. Get at least three quotes
We recommend getting at least three quotes from reputable window companies to compare before you go ahead with your purchase.
You can fill in our online quote form, and we will get back to you asap with a free, no-obligation quote.
Available incentives and rebates
Although there are not any government-funded window grants available in the UK at the time of writing, there are a couple of potential avenues for funding, including:
- The Care & Repair Scheme
- The Housing Air for Older People Scheme
- Home Repair Assistance Grant
- Home Improvement grant (local authority)
The Green Homes Grant is closed to new applicants. However, if you have received a voucher that is still in date, you can use it to part-fund eco-friendly home improvements, such as energy-efficient windows.
Why Choose Manchester Window Factory?
Even the most energy-efficient windows in the world will perform poorly if not installed properly. Any gaps between the window and frame will not only cause drafts but can allow water to get inside, reducing the lifespan of the frame and window significantly.
All windows should be installed by professional fitters, to avoid any gaping, comply with building regulations, and for safety.
Our friendly and professional team includes expert glazers and fitters who can replace your old windows with energy-efficient upgrades.
We don’t believe in advertising and can pass the savings on to you, our customers.
Starting as a family business, we have retained that personal touch and are happy to work alongside you to create bespoke designs.
We have built our business on word of mouth and are proud to have received thousands of positive reviews.
We look forward to hearing from you!
FAQ’s
Absolutely! While they may cost more initially, energy-efficient windows can significantly lower energy bills, boost your curb appeal, and increase your home’s resale value. They are a form of futureproofing, not just for when you want to sell your home, but also to ensure your windows meet changing Government guidelines and building regulations.
By reducing drafts and heat loss, these windows help maintain consistent indoor temperatures to make your home more comfortable year-round.
No, as with standard windows, the level of care required is primarily determined by the material of the frame. Timber usually requires more maintenance than UPVC or aluminium. However, cleaning the glass and inspecting seals regularly ensures optimal performance.
Yes, especially double or triple-glazed windows, which can reduce noise pollution significantly, making them ideal for urban or noisy environments.
In many regions, the UK government offers tax credits, rebates, or grants to encourage homeowners to install energy-efficient windows. Check your local programs for details.
Yes, they can be custom-fitted to replace existing windows in older homes without compromising the property’s aesthetic. Energy-efficient windows can be customised to blend in with your existing architecture and decor.
Many models include low-E coatings that block harmful UV rays, protecting your furniture and flooring from fading.
In conservation areas, there are stricter rules to preserve the historical appearance and structural integrity of buildings. While energy-efficient options are available for such properties, they often need to be custom-made to match the original style. Always consult your local planning office before proceeding.
Installing energy-efficient windows in listed buildings requires special permissions since these properties are protected for their historical significance. There are levels of listed buildings with different requirements, so always check with your local authority before planning any building work Secondary glazing or specially designed windows that maintain the original character may be acceptable alternatives.
