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 who elect to install double glazing can expect to save about one-half of their current energy consumption. Good quality double-glazed windows are extremely efficient at blocking not only heat loss but also air and noise pollution. They will make your home quieter, cleaner, warmer (or cooler in summer) and more comfortable. They’re very good at their job.
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.
Some glass used in double-glazing is termed ‘Low-E’, which stands for low emissivity. This is a fairly new technological advancement and is extremely effective. Low-E glass has a microscopic coating on one side which is able to keep heat in your house in winter yet repel heat rays trying to enter during the hotter months of the year. This is very ‘smart’ glass and knows just when to keep your space warmer or cooler.
Because an air-tight seal is critical for double-glazed windows to perform properly, condensation (moisture build-up) is a rarity. Secondary glazing, however, does have problems in this area, due to its configuration. These are windows applied from the home’s interior, right over the existing windows (usually single-glazed units). This method is not nearly as efficient as replacement with double-glazed models but may still be the best (or only) option in some cases.
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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