If the hermetic seal of a window is compromised, how does it affect its energy efficiency?

When the hermetic seal of a window is compromised, it significantly reduces the window's energy efficiency. The hermetic seal is designed to trap an insulating gas between the glass panes, which helps in preventing heat transfer between the interior and the exterior of a building. This insulation reduces the energy required for heating or cooling the space.

If the seal is broken, the gas can escape, leading to a drop in thermal performance. The window may then allow more heat to enter during the summer and escape during the winter, thereby increasing energy demands for heating and cooling systems. This leads to higher energy costs and reduces overall comfort within the space. Therefore, energy efficiency is clearly reduced when the hermetic seal is compromised.