A-Rated Windows for Irish Homes
If you’re replacing your windows, you’ll have seen the term “A-rated” everywhere. This page explains what it means, what difference it makes to your home, and how to choose the right windows for your budget.
What Are A-Rated Windows?
A-rated windows have been independently tested and given an energy rating of A on the Window Energy Rating (WER) scale, which runs from A++ (best) down to G (worst). It works much like the energy label on a fridge or washing machine.
The rating looks at more than just how well the window holds in heat. It balances three things:
- Heat loss through the glass and frame (the U-value).
- Free heat from the sun that passes through the glass (solar gain).
- Air leakage around the window.
An A rating means the window gains at least as much useful heat as it loses over a typical heating season. Older double glazing, by comparison, is often rated D or lower, and original single-glazed windows lose a lot of heat.
Why Choose A-Rated Windows?
Lower heating bills. Windows are one of the biggest sources of heat loss in a house. Upgrading to A-rated units keeps more warmth in during winter, so your heating works less.
A warmer, more comfortable home. No more cold spots, draughts or chilly rooms next to the window. Modern glazing also helps keep rooms from overheating in summer.
Less condensation. Warmer inner glass surfaces mean fewer damp, misty windows. See our guide to condensation for more.
Quieter rooms. The same sealed, multi-layer construction that holds heat in also cuts down traffic and street noise.
Better BER and added value. A more energy-efficient home can improve your Building Energy Rating, which matters when it comes to selling or renting.
How Do We Get to A-Rated?
Several things work together:
- Quality uPVC frames. Multi-chambered frames are excellent insulators. Read more about what uPVC is.
- Low-emissivity (Low-E) glass. A microscopically thin coating reflects heat back into the room.
- Warm edge spacer bars. These reduce heat loss at the edge of the glass, where it’s usually worst.
- Gas-filled units. Argon between the panes slows heat transfer.
- Double or triple glazing. Triple glazing goes further still. See the benefits of triple glazing.
- Precision installation. Even the best window underperforms if it’s poorly fitted and sealed.
Double Glazed or Triple Glazed A-Rated Windows?
Both can achieve an A rating. Double glazing is usually the more affordable option and is a big upgrade on older windows. Triple glazing offers better insulation and sound reduction, and can be worth it for north-facing rooms, exposed sites, or if you want to get the most out of your home’s energy performance. We’ll happily recommend the right choice for each room when we quote.
Colours and Styles
Energy efficiency doesn’t mean compromising on looks. Our A-rated windows are available in a range of finishes, including black windows, grey windows and cream windows, as well as tilt and turn styles. They suit everything from period houses to new builds and bungalows.
Grants for Energy Efficient Windows
Upgrading to energy efficient windows may qualify you for support under Irish home energy schemes. Weatherglaze is a registered contractor under the BEH programme. Take a look at our page on grants for windows and doors for the latest information.
Frequently Asked Questions
Are A-rated windows worth the extra cost? In most cases the difference in price between a mid-range and an A-rated window is modest, and savings on heating, comfort and home value add up over the life of the windows.
Will A-rated windows stop condensation? They greatly reduce condensation caused by cold glass. Moisture from cooking, drying clothes and showering still needs ventilating, so we’ll advise you on trickle vents and airflow.
Do I need planning permission? Replacement windows are generally exempt, but protected structures and some other properties can have restrictions. We can advise you when you get in touch.
How long does installation take? Most homes are completed in one to two days once the windows are made. We’ll confirm timings when we quote.
Are your windows guaranteed? Yes. See our guarantee for the details.
Get a Free Quote on A-Rated Windows
Ready to make your home warmer and cheaper to run? Request your free quote and a member of the Weatherglaze team will talk you through your options. Don’t forget to ask about our current 15% saving on windows and doors.
