Both double glazing and secondary glazing are common ways for homeowners to improve the efficiency of their living spaces. Both work well to not only save energy but also reduce carbon emissions coming from a house. These two methods, however, are by no means equal in efficiency. One of the most notable differences is with secondary glazing and condensation.
If you choose to install double-glazed windows you should see savings on your energy bill, reducing it to about one half of its current amount. A high-quality double-paned window is very efficient at its job, which is to reduce heat loss and insulate against outside noise and air pollution. Your home will be cleaner and quieter and, most of all, more comfortable and efficient.
One reason double glazing is so effective is because of the insulating space between the two panes of glass. This may be filled with air, gas (such as argon) or left empty (with a slight vacuum). This space acts as an insulating barrier and must be properly sealed in order to function correctly.
Sometimes \’Low Emissivity\’ (Low-E) glass is used, which significantly increases the window\’s efficiency. This Low-E coating, applied to one side of the glass pane, is able to keep the heat in your house by bouncing it back when it\’s trying to escape through the window. At the same time, Low-E allows the sun\’s solar rays through, making good use of the sun\’s warmth. It\’s a great technological innovation.
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.
Secondary glazing can be utilized without obtaining planning consent. If you happen to live in a Conservation area or your home is listed you may not be permitted to install newer style windows. The secondary glazing option may be your only recourse.
Besides problems with secondary glazing and condensation there are also a few other considerations. Secondary, internally fitted windows may be inconvenient during the warmer months and will need to be removed and stored away. In case of an emergency (such as a fire) they might make escape from the home more difficult. But, in certain situations they are definitely a viable option.
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