Retrofit Double Glazing Windows

Live In A Hot Climate? Wonder If Double Glazing Is Suitable?

Double glazed windows prove well-known for one thing they do well, and that’s keeping outside cold from entering a home. However, are they also viable for hot climate homes? There’s a myth that they’re not great for warmer weather, and it likely started because double glazing was something that started in colder parts of the planet. However, facts show this myth to be false.

So, How Does Double Glazing Function?

Any window that is double glazed has not one, but two, panes of glass. There’s also a void in between them. That void is the trick to their power in establishing an insulating barrier between the outdoors and the home’s interior. That void might be regular air, but some companies use specific types of gas for enhanced thermal efficiency. In either case, a double-glazed window makes for fat better insulation from heat or cold than single-pane windows provide.

A window’s ability to conduct heat is objectively measured. That measurement is sometimes called a Uw-value, but is more commonly called a U-value. There are complicated methods of calculating U-values. However, reading one is simple. When a U-value is lower, the window is less able to conduct heat. In residential homes, low U-values are good to have because it means a reduced transfer of cold or heat in or out. What’s the difference you might wonder? A conventional 4mm-thick single-pane window has a U-value of almost 6. Double-glazed windows sometimes have U-values less than half that.

Thermal transfer is something that is measured in units called watts, a more traditional energy measurement. That’s a good way to see just how substantial potential energy savings from double glazing can prove. Here’s a simple enough formula you can use to figure out possible savings:

1) Measure your home windows to compute the square meters of them altogether.
2) Calculate what the difference is in temperature between the inside of your home and the outside environment when you have heat or air conditioning running.
3) Multiply both those numbers.
4) Multiply them by your current window’s U-value. If you’re not sure what it is, just assume the standard 5.58.

For instance, if your windows cover 60 meters squared area, your indoor/outdoor temperature differential is 15 degrees, and your current window’s U-value is 6.00, then the formula becomes 60 x 15 x 6 = 5,400 watts. Halving that U-value means you save 2,700 watts of energy.

When done in conjunction with passive solar design, the use of double glazing for your hot climate home can actually reduce your greenhouse emissions and energy bills rather substantially. A lot of newer home builders are discovering that they’re able to cut out air conditioning completely in many sub-tropical or temperate environments, and even drastically cut back on how much they rely on air conditioning, even in a hot climate. Click on this link to learn more.


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Magnetite Perth (08) 9249 4088
3/30 Crocker Dr Malaga WA 6090
(08) 9249 4008