Double glazing cuts heat loss, noise and condensation, by trapping air in a gap between the two panes of glass. This forms an insulating barrier.
Building Regulations also require that ‘low emissivity’ or ‘low E double glazing’ is used for all new and replacement windows. Low E glass has a special invisible metallic coating that reflects heat back into the room, thus conserving heat.
Replacement double- glazed windows come in a variety of styles and sizes. Aluminium and PVCU frames are virtually maintenance free, while wooden frames need to be painted regularly. Replacing single- glazed windows with low E double glazing could cut your heating bill by £40 per year.
Secondary glazing is less expensive than replacement double glazing and can still save you around £30 a year in heating bills.
Contacts
Energy Saving Trust Advice Centre for London
Telephone: 0800 512012
E-mail: advice@est-london.org.uk
Website: www.energysavingtrust.org.uk/london