Insulating Glass Units (IGUs): Rare gases are often filled between the glass panes of an insulating glass unit. This creates a thermal barrier that helps to reduce heat transfer and improve the energy efficiency of the window. Argon and krypton gases are preferred due to their low thermal conductivity compared to air. Energy Efficiency: The presence of rare gases in IGUs improves the window’s energy efficiency by reducing heat loss or gain. This helps to maintain a more comfortable indoor temperature and reduces the need for heating or cooling, resulting in lower energy consumption and cost savings. Sound Insulation: Rare gases also contribute to sound insulation in windows. The denser nature of argon and krypton gases compared to air helps to dampen sound waves, reducing noise transmission through the window and improving acoustic comfort in buildings. Spacer Systems: Rare gases are often combined with specialized spacer systems in window manufacturing. These spacer systems help to maintain the proper distance between the glass panes, ensuring the gas fill remains intact and preventing condensation or gas leakage.