There are a few options that can be included into the design of double glazed windows. For example, the double glazed units can be filled with argon or krypton gas in the gap between the panes; this prevents a lot of heat (or cold) radiating from one side of the window to the other.
The panes can be also held apart by “warm edge” spacers, these spacers contain little or no metal so that, once again, heat transfer is kept to a minimum. By regulating the size of the gap between the panes of glass it stops any circulation of the internal “air” this also keeps the cold on one side and the heat on the other.
Passive solar gain is the latest buzz word for double glazed windows, broadly what this means is that the window allows more heat to penetrate into the home than it lets out, obviously adding to the internal warmth of the home at no cost and literally giving homeowners “free heat”.
There is a massive choice in the market in terms of design, colour and price, so no matter what your home looks like or what you budget is, there should be something to suit all tastes. So the next thing to do is to go to a reputable online double glazing comparison site and find out more