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What is a U-value, and what value should I be aiming for?

Thursday 29th January 2026

If you’re researching ways to improve the insulation or energy efficiency of your home, you’ll no doubt hear mentions of U-values.
U-value is an important concept for anybody interested in making their home warmer and cheaper to run, but it can seem a little intimidating at first.
Let’s break down the basics and demonstrate how to use U-values in practice.

What is a U-value, and what value should I be aiming for? What is a U-value, and what value should I be aiming for?

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