Energy Conservation

Energy Ratings

 

Window Energy Ratings use a consumer-friendly traffic-light style A-E ratings guide similar to that used on ‘white’ goods (such as fridges, freezers, washing machines etc…). This ratings label can be used by you to make more informed choices about the energy efficiency of the windows you are looking to purchase.

With carbon emissions high on the global agenda and the current high cost of fuel, we are all looking for ways to make our homes more energy efficient.

Each window rated has a unique label

This label will display the following information:

1. The rating level – A, B, C, etc…
2. The energy rating eg. -3kWh/(m²·K) in this example the product will lose 3 kilowatt hours per square metre per year.
3. The window U value eg. 1.4W/(m²·K)
4. The effective heat loss due to air penetration as L
eg. 0.01 W/(m²·K)
5. The solar heat gain eg. g=0.43

Simply put this will determine how well a product will perform the functions of:

* Helping you contain and conserve heat within your building in the winter

* Keep out the wind

* Resist condensation

* Contribute to improved sound insulation

So What are Energy Efficient Windows?  They are windows that help to contain and conserve heat within the home keeping out wind and rain, resisting condensation and yet allowing natural “free” energy - the warmth of the sun - to heat the home. They can be made using any frame material - aluminium, PVC-U, steel or timber or even a combination of materials.


 

Energy Efficient Glazing – the basics 

All properties lose heat through their windows. Installing energy efficient glazing is an effective way of reducing your energy bills and keeping your home warmer and quieter.

Double glazed windows use two sheets of glass with a gap between them which creates an insulating barrier, whilst triple glazed windows have three sheets of glass. Both options can deliver a high level of energy efficiency. It is not the case that you have to use triple glazing to gain the most energy efficient window.

Energy efficient windows are available in a variety of frame materials and styles. They also vary in their energy efficiency, depending on how well they stop heat from passing through the window, how much sunlight travels through the glass and how little air can leak in or out around the window.

Some window and door manufacturers helpfully use a window energy rating scheme to show the energy efficiency of their product. This is similar to the one you may have seen on appliances such as your fridge, or washing machine. A-rated windows are the most efficient. To check a window’s energy efficiency before you buy, look at the energy label.

The benefits of double glazing 

• Smaller energy bills: replacing all single glazed windows with energy efficient glazing could save you around £135 per year on your energy bills.

• A smaller carbon footprint: by using less fuel, you’ll generate less of the carbon dioxide (CO₂) that leads to global warming.

• A more comfortable home: energy efficient glazing reduces heat loss through windows and means fewer draughts and cold spots.

• Peace and quiet: as well as keeping the heat in, energy efficient windows insulate your home against unwanted outside noise.

• Reduced condensation: energy efficient glazing reduces condensation build-up on the inside of windows.

The costs and savings of double glazing will be different for each home and each window, depending on the size, material and installer.

Green Materials

Nordic Pine                        Hardwood