• Jul



A Guide to Energy Efficient Windows

upvc window

Energy bills can be a constant nightmare. Month after month.

But there are changes that can be made to reduce your energy bills and improve the energy efficiency of your home.

Energy efficient windows are the answer. But what are they, and how can they help?

How energy efficient windows are rated

There are three factors considered when rating the energy efficiency of windows: 

Solar heat gain: The amount of heat transferred to and retained within your home from the sun’s rays 

Air loss: The amount of heat lost from your home through air escaping between gaps in the window frame

Thermal loss: The amount of heat transferred from within your home to the outside through conduction. 

Based on these criteria, windows are rated according to ratings provided by the British Fenestration Ratings Council (BFRC) to provide you with an at-a-glance view of the energy performance of your windows. All windows are rated from A++ to E with A++ providing the best energy performance available. 

How Energy Efficient Windows Work 

The most energy efficient windows are developed through advanced manufacturing techniques to maximise the above criteria in the following ways: 

Solar heat gain 

A microscopic reflective layer in the inside pane of glass allows the sunlight and its heat to enter your home, while reflecting the heat back inside, thereby maximising the amount of heat gained from sunlight. 

Air loss

Seals between the glass and frame, combined with effective opening mechanisms of the window minimise gaps, thereby dramatically reducing air loss. 

Thermal loss

Adding a second or third pane of glass creates additional material for the heat to pass through before it gets outside, leading to it taking longer to cool the air inside your home. In addition, the air or gas-filled cavity is warmed by the air in your home, creating an additional layer of insulation. 

Energy efficient window frames are also manufactured with cavities inside to create a layer of thermal insulation within the frame itself. 

Energy efficient windows can help you to reduce your carbon footprint as well as your heating bills, while also giving the appearance of your home a welcome lift.

Interested in upgrading your windows in the West Sussex area? Get a free window quote today.

About Us

Barnham Windows & Conservatories have been supplying and installing beautifully designed and high quality doors, windows and conservatories for over 35 years. Based in Barnham, West Sussex our goal is to provide our customers with a first class design and installation service at an affordable price.

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