We have an encyclopaedic knowledge of this kind of terminology as we have been involved in windows for an eternity and the two things are aligned.
Awareness of what a U-value is will help you understand exactly what you’re getting when eyeing up new replacement windows.
There’s more to disclose on U-values, so let’s go ahead and do just that, making you an expert on them.
Why is a Window’s U-value Significant?
It signals how successful replacement windows are at providing thermal insulation – the lower the U-value, the greater the amount of insulation a window offers, converting homes into energy efficient spaces blessed with copious warmth and comfort.
To use a separate definition U-values, high thermal transmittance is an indicator of poor window insulation and will see a window let out essential heat, wasting valuable energy and money.

How Different Windows Fare for U-values
Placing in last position in a competition against double glazed and triple glazed windows are single glazed windows, with their thermal transmittance falling well behind the two other solutions.
Some single glazing only manages a U-value of 6.0 W/m²K, while a double glazed window averages anywhere between 1.2 and 3.7 W/m²K (current building regulations stipulate a minimum of 1.4 W/m²K). Out in front is triple glazing, capable of accomplishing a unit u-value figure below 1.0 W/m²K.

Energy Efficient Glazing Uplifts Window U-values
You can’t go without energy-efficient glazing if you want a window to realise outstanding insulation performance.
All energy-efficient glazing is crafted to thwart heat loss and bolster thermal insulation. Low-E glass is one of its fundamental components and possesses an invisible coating developed to reflect heat.
Adding it to a double or triple glazed window unit ensures any coldness in a home will be eliminated and excess heat banished in summer, converting rooms into cosier spaces that cost less to warm.
Always observe U-values when choosing energy-efficient glazing and recognise the effect it will have on security, privacy and sound insulation.

Customers of 5 Star get energy-efficient glazing as a standard benefit in all its replacement windows, just so you know.
If any other window terminology has you feeling puzzled, contact 5 Star for a definition and whatever other assistance you may require.
LOOKING TO REPLACE YOUR WINDOWS?
We have a fantastic range to choose from so whether it’s a modern style or traditional timber effect windows – we are confident that we will have windows to improve any home to give it the finished look with elegance.
LOOKING TO REPLACE YOUR WINDOWS?
We have a fantastic range to choose from so whether it’s a modern style or traditional timber effect windows – we are confident that we will have windows to improve any home to give it the finished look with elegance.
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Simply call us on 01562 60800 or fill in your details for your free, no-obligation quotation, and click “Get Quote.”