Insulating glass units (IGUs), or sealed units, are vital for achieving energy-efficient and sustainable building facades.

Research from Glass Performance Days 2025 shows that gas fill quality directly determines an IGU’s long-term insulation performance.

Even visually intact units can suffer gas loss over time, reducing thermal efficiency and increasing carbon emissions.

Non-invasive gas measurement enables manufacturers and consultants to verify performance during production and throughout the building lifecycle.

Reliable quality control through verified gas fill levels is essential to ensure durable, energy-efficient, and truly sustainable facades.

How long do insulating glass units (IGUs) also known as sealed units truly maintain their thermal performance?
Recent research “Sustainable Glass Facades: Understanding the Long-Term Thermal Performance of IGUs” which was presented in Glass Performance Days 2025 reveals that an IGU’s performance is not static. Over time, gas leakage and coating deterioration can significantly reduce insulation efficiency, increasing both operational energy demand and a building’s carbon footprint.

For manufacturers, facade consultants, and architects, this raises a critical question:
How can we ensure that IGUs deliver reliable insulation over decades, not just at installation?

Watch Chris Davis and Kevin Yin’s presentation at GPD 2025 about their research: