Energy Saving Trust study also reveals that substandard glazing also emits 3.5 million tonnes of CO2.

UK households are belching out over 3.5 million tonnes of carbon dioxide emissions and wasting £370m every year because their windows are not insulated enough, a new study has revealed.

The Energy Saving Trust has found that the problem is caused by low insulated windows and is urging industry to help stop energy wastage by installing more energy efficient models.

Four of the UK’s leading glazing manufacturers have become the first in the industry to win endorsement from the Energy Saving Trust for their new energy efficient windows. JG Glass, MasterFrame, Speed Frame and McMcllhatton will carry the energy saving recommended logo and are available to the construction industry now.

Richard Bawden, Trade Partnerships Manager at the Energy Saving Trust said: “Our homes are responsible for 28 per cent of all UK carbon dioxide emissions and as windows are responsible for 20 per cent of all heat lost in an average home, improving their efficiency is an important step towards combating climate change.

Manufacturers are already experiencing demand for the products which will typically save around £70 in heating bills and over half a tonne of carbon dioxide emissions per year.