What a U-Value Actually Measures U-values are often presented as one of the most important numbers when comparing windows and doors, yet they are rarely explained in a way that makes sense to homeowners. The term itself sounds highly technical, leading many people to assume it requires specialist knowledge to understand. In reality, the concept […]
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What A U-Value Actually Measures A U-value is one of the most commonly quoted performance figures in the glazing industry. It appears in brochures, technical documents, building regulation discussions and sales conversations. Yet despite how often it is used, many homeowners are never given a clear explanation of what the number actually means. In simple […]


