Reduce heating bills with energy efficient composite windows

Around a third of a property’s heat is lost through poorly insulated windows, so ensuring you fit energy efficient composite windows should be high on your list of priorities, whether you’re replacing existing windows and doors or designing a new house or building. 

According to the Energy Saving Trust website*, just by installing double-glazing to windows in an entirely single-glazed property you could save up to £115 per year.

Heat loss is measured by the thermal transmittance characteristics of a material or U-value. It is expressed in Watts/m²Kelvin which is a measurement of the amount of energy conducted per square metre multiplied by the temperature difference on either side of the material.  The lower the U-value, the greater its thermal insulation properties.

Our triple-glazed Design Series has U-values as low as 1.0 W/m2 for opening windows and down to 0.9 W/m2 for fixed windows, making them our most energy efficient composite windows.

With Westcoast Windows the aluminium and timber are bonded to make a truly composite frame and sash.  The timber element acts as a thermal break to ensure very high levels of insulation, and seals housed into the grooves within the sash create exceptional air and weather tightness. Read more about the construction in our HOMEOWNER GUIDANCE section.

Westcoast windows and doors are factory double or triple glazed with 28mm, 36mm or 48mm dual sealed units constructed to EN 1279-2:2002, incorporating the latest ‘warm edge’ technology, single or multiple low emissivity coated glass and argon gas filling as standard.

By using our high performance windows and doors, you can create an energy efficient home and a pleasant living space, whilst helping to reduce heating costs and also lessen your impact on the environment.

Find out how Westcoast Windows composite windows can help you save on energy bills – contact our skilled UK-based team on 01359 241944 or email:

Find out how our composite windows were the ideal energy efficient glazing solution for a contemporary eco house holiday home in Cornwall:
Energy Efficient Glazing Holiday Home Cornwall

composite windows for eco house holiday home

*For further reading on Energy Efficient Windows visit the Energy Saving Trust website.

Reduce heating bills with energy efficient composite windows
Reduce heating bills with energy efficient composite windows
Reduce heating bills with energy efficient composite windows