Two of the more common ways for homeowners to increase their home’s energy efficiency is to install either secondary- or double-glazed windows. Both of these systems work relatively well for cutting heating and cooling costs and for reducing the ‘carbon foot print’ of the dwelling. They are not, however, equal in efficiency. There is a significant problem, for example, with secondary glazing and condensation build-up.

Those opting for double-glazed window installation should see their home’s energy consumption cut in half in most cases. A good set of double-paned windows is an extremely efficient way of making an energy miser of your home. They will keep your home warmer in winter and cooler in summer. They will also insulate your living space from noise and dust, making it both quieter and cleaner.

What makes double-glazing work so well is the sealed space left between the two panes of glass. This void, which may either contain a vacuum or be filled with air or another gas (usually argon), makes for a very good insulation barrier between you and the outside world. This insulating space must be completely sealed (air-tight) in order to function properly.

If Low-E glass is used the window will be even more efficient. Low-E, which stands for low-emissivity, is a microscopically small coating added to one side of the glass. This enables the window to bounce back long-waves of energy (room heat, for example) into the room but allow short-waves (solar energy from the sun) to enter. This is very ‘smart’ glass.

Because proper double-glazing will employ an air-tight seal, chances of condensation appearing are minimal. The same cannot be said about secondary glazing, which is one of its shortcomings. Because secondary windows are placed on the inside of existing single-paned windows they just don’t work as well as when the primary window is replaced with a double-glazed unit. Unfortunately, adding double-paned models isn’t always possible.

For one thing, secondary glazing can be used even in Conservation areas and may be installed without planning consent. If your home is listed this may be your only viable option. In that case a few things should be considered.

Secondary glazing and condensation problems associated with this method of upgrading your windows is something to consider. They will also cut your energy bill and reduce your emissions but only about half as much as the double-glazed units. Half, of course, is better than none and, in some cases may be the only alternative. Consider the options.

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