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Style and Design
Double glazing is available in many different styles and types, and most people attempt to match style of their old windows with new if at all possible, especially when doing restoration work. A good, reputable contractor will work with you to find double glazing windows that suit your architecture and enhance your home's beauty.
The three main frame types are PVCu, aluminum and wood, and each has its unique advantages and disadvantages. In a nutshell - PVCu frames are best at energy conservation, aluminum frames are sturdiest, and wooden frames are most attractive - at least in view of some. For more detailed information about advantages of each, see related articles.
Type of Glass
Safety glass, tempered glass, low-e glass, Pilkington K glass - there are many types of glass that are used in double glazing. Glass with energy coatings - low-e and Pilkington K among them - add further insulating properties to your windows, and can certainly be worth that additional expense.
Shop for a contractor and supplier as carefully as you do for glass. Shoddily done work can negate all advantages gained in choosing to replace your current windows with double glazing. Look into company's history and check for any complaints against them, even ask for references from others for whom they have done work. Installing double glazing throughout your house is an expensive proposition - it only makes sense to know people who will be doing work.
Matthew Anthony regularly contributes to home improvement sites such as double glazing and blinds.