What are dual pane/insulated units?

Most new homes being built today are built with dual pane or insulated windows. These terms are typically used interchangeably. Dual pane windows are composed of 2 pieces of glass joined by a spacer, which creates an "air-space" between the two panes.

It's this air-space that creates the insulating properties that makes these units so energy efficient. The size of the air-space determines for the most part how efficient the window will be. For instance, a unit with a 1" air-space will be much more efficient than a unit with a " air space.

Other factors like "Low-E" or tinted glass can also increase efficiency. More.

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