How to Choose Energy Efficient Double Glazed Windows

30 November 2015
 Categories: , Blog


All buildings lose heat through their windows. In order to reduce energy bills effectively while keeping the rooms warm, it is necessary to install double glazed windows. Double glazed windows consist of two planes of glass with a layer of inert gas sealed between them. This inert gas provides an insulating barrier, giving double glazed windows better insulation compared to single glazed ones. However, double glazing requires excellent sealing to maximise on insulation properties.

In order to effectively reduce energy costs, there are various factors that come into play when carrying out installation of double glazed windows. These include the following.

Type of glazing glass

Modern homes and buildings use low-emissivity glazing glass as opposed to older double glazed windows that did little to reduce heating costs. Low-emissivity glass, also known as low-e glass is a special type of glass that is designed to prevent heat loss through the windows. It is made of an invisible coating that substantially reduces heat loss by reflecting it back into the room. Since not all double glazed windows have low-emissivity, you should ensure that you get those with these properties.

Spacing between panes

The spacing between glass panes is essential in maximising the energy efficiency of double glazed windows. This spacing will be determined by the purpose for which you are installing the glazing. This can be for thermal insulation, better acoustics and reduced noise from traffic or aircrafts. Since the spacing will be varying, your installer should recommend the best range depending on the desired performance.

Window frame material

The type of window frame material chosen is as important as the glazing. This is because it will greatly contribute to reducing or facilitating heat loss. Some of the best materials for double glazed window frames include timber, PVC, aluminium and combination of aluminium and timber.

Timber and PVC are highly efficient since they do not conduct heat. However, PVC is more durable and requires less maintenance compared to timber. When using aluminium, you should install a thermal break that prevents heat transmission through the frame.  Aluminium is light, strong and also requires little maintenance. When combined with timber, it becomes highly energy efficient.

Ventilation requirements

Double glazed windows are usually more airtight than normal windows in order to reduce heat loss. You need to ensure that the rooms are properly ventilated to allow moisture to escape and fresh air in. If the passive ventilations available are not enough, you can have replacement windows designed for controlled ventilation.

The process of choosing energy efficient double glazed windows also involves getting a good installer. A person who is well experienced will ensure that installation is targeted at maximising insulation properties and achieving energy efficiency.