Energy Efficiency

Our market-leading uPVC windows, Doors and Conservatories provide superior energy efficiency and thermal insulation.

Marathon Windows provide energy efficient double glazed windows, doors and conservatories in Surrey. Our replacement windows and doors are a valuable investment, improving the comfort and warmth of your home, as well as helping reduce those costly energy bills.

Losing Valuable Heat

Not only can poorly chosen windows and doors ruin the appearance of your home but they can also let in draughts and cause cold spots. Did you know that around 20% of the heat escaping your home is lost through poorly fitted windows? This is why more and more home owners are choosing higher quality windows with greater energy saving benefits.


Energy Efficiency

Our modern high-quality windows are extremely energy efficient and durable. They are design-engineered for superior thermal insulation, making them the perfect replacement windows for any home in Epsom, Coulsdon, Surrey and surrounding areas.

Energy Saving Benefits

  • Eliminate Draughts and Cold Spots
  • Greater Thermal Insulation
  • Long Term Money Saving Benefits
  • Environmentally Friendly
  • Helps Reduce  Your Carbon Footprint

Window Energy Ratings (WER)

Window Energy Ratings are a guide to the energy performance of your windows. The British Fenestration Ratings Council, also known as the BFRC, ensures all the components of your windows meets the required energy rating standards. A window can achieve a rating from A-G depending on how efficient it is. The more efficient the window, the higher the energy rating – A being the most thermally efficient.

The minimum requirement for new homes is a ‘C’ WER rating so this is a useful benchmark to use when considering replacement windows. The good news is, our uPVC windows have an energy rating of beyond A+ thanks to their superior multi-chambered profile and uPVC thermal inserts. Our window frames are one of the most energy efficient profiles in the UK.

Sustainable and Environmentally Friendly

All our uPVC windows are manufactured using sustainable methods. We use 100% recycled materials in our thermal inserts and all our components meets the standards of ISO14001 of environmental performance.

Energy Efficient window