Replacing windows can be a fantastic way to stop the bleeding of energy from your home. Older windows may lack the insulating ability that newer windows do and may even have gaps and spaces around them that will allow direct heat loss. It is estimated that as much as a third of a home’s heat may be lost through the windows alone. A home with newer, more energy-efficient windows can reduce the amount of power that will be needed to heat or cool a home and keep it at a temperature that is comfortable and consistent.

How are energy efficient windows made?

The standard energy efficient window is one that is "double hung" or "double glazed". This means that there are two panes of glazing material which are set into a metal or wooden frame. The panes of glazing material are set apart from one another and the space in between is filled with gas. This gas prevents the transfer of heat energy through the window in either direction. This means that the internal temperature of a home will remain at a more consistent level than it would with a conventional, single hung window.

There are different types of gas that can be used in between the panes of glazing material. This is one factor that can affect a window’s efficiency rating. The distance between the panes of glazing material and the type of glazing material used can affect a window’s efficiency level.

R-Values or U-Values

There are two main ways that the efficiency of a window can be expressed. The first is an R-value. This value refers to how well a window can resist the flow of heat through the glazing material. The second rating is a U-value. This value refers to how well a window will conduct heat. A window can have its energy efficiency expressed in either of these ways. If you are serious about making sure you’re your windows are as energy efficient as possible you need to look for a higher R-value as these will allow less heat in or out of your home. Low R-value windows may just not retain enough energy to make their purchase worthwhile.

Installation is important

As important as the actual window is, it is also important to ensure that it has been properly installed as well. A window that is improperly installed can still allow heat loss through gaps or spaces around the frame. You want to make sure that you are dealing with a licensed window installation expert who is able to make sure that there are no gaps or cracks and that the area has been properly insulated.

The decision to replace windows can be an expensive one. By choosing the right windows you can lower your energy costs and, in time, they will pay for themselves.