A warm edge spacer bar, and argon gas are all components that can be used in the construction of a double or triple glazed glass unit. Here are the benefits of each: Warm edge spacer is a type of spacer bar made from a high-performance composite material that provides excellent thermal insulation. By reducing heat transfer through the edges of the glass, warm edge spacer helps to improve the overall energy efficiency of the glass unit. By using a warm edge spacer, the temperature differential between the edge of the glass and the interior of the room is reduced, helping to improve the energy efficiency of the window.