What Are U-Values in Double Glazed Sealed Units?
What Are U-Values in Double Glazed Sealed Units?
When choosing energy-efficient windows, understanding U-values is essential. But what are U-values in double glazed sealed units, and why do they matter?
Understanding U-Values in Double Glazing
A U-value measures the rate of heat transfer through a material, indicating how well it insulates. In double glazed sealed units, a lower U-value means better thermal efficiency, reducing heat loss and improving energy savings.
U-values are measured in W/m²K (watts per square meter per degree Kelvin), and the lower the value, the better the insulation.
Typical U-Values for Double Glazed Sealed Units
• Standard double glazing: U-value of 2.6 - 2.8 W/m²K
• Low-E (low emissivity) double glazing: U-value of 1.3 W/m²K
• Gas-filled (Argon/Krypton) double glazing: U-value of 1.2 W/m²K
Star Glazing™ high-performance sealed units provide excellent thermal efficiency.
How we Improve U-Values in Double Glazed Units
1. Low-E Coatings – Reflects heat back into the room while allowing natural light in.
2. Gas Filling – Argon gas between panes reduces heat transfer.
3. Warm Edge Spacer Bars – Reduces thermal bridging around the edge of the unit.
4. High-Performance Glass – We only use Pilkington Glass for our sealed units.
Why U-Values Matter for Homeowners
Lower U-values in double glazed sealed units mean:
✅ Reduced heating bills
✅ Improved comfort with fewer cold spots
✅ Better compliance with building regulations
✅ Increased property value
When selecting new sealed units, Star Glazing™ U-values helps ensure maximum energy efficiency and long-term savings.