What does "hermetically sealed air space" ensure in insulating glass?

A hermetically sealed air space in insulating glass is designed to improve energy efficiency. This sealing creates a barrier that minimizes the transfer of heat between the inside and outside environments. By containing a layer of air or gas between two panes of glass, the insulating properties of the assembly are significantly enhanced. This reduces the need for heating and cooling, as the sealed space helps to maintain the interior climate, leading to lower energy consumption and increased comfort for occupants.

While reduced weight, greater heat transfer, and better visibility can be beneficial aspects of certain glass designs, they do not fundamentally relate to the primary purpose of a hermetically sealed air space. The main goal of this feature is to create an effective insulation barrier, which directly contributes to energy efficiency, making the space more environmentally friendly and cost-effective over time.