Advances in glass technology have contributed greatly to energy efficiency as well as comfort levels.Temperatures vary considerably between day and night, and from season to season.
The greater the temperature difference between inside and outside, the greater the heat flow.
Heat travels relatively easily through ordinary glass. In winter from inside to outside, and in summer from outside towards cooler air inside. This process can be slowed with insulation.
The incorporation of Insulated Glass Units (double glazing) into windows and glazing is an established approach to improving the thermal insulation performance.
Double glazing can be considered for both cooler climates as well as warm environments to provide improved comfort and more efficient use of energy.