As you know, ENERGY STAR is a government supported program that uses a specific criteria to define an energy efficient window. Starting January 1, 2015, and as noted in the graph below, that criteria will be changing for windows in the North Central, South Central and Southern zones only.

 

How does ENERGY STAR measure its criteria? By measuring four different parts of the window: the glass, the gas, the spacer and the reinforcement. The combination of these factors influences the unit’s u-value and solar heat gain, both of which are drivers for meeting ENERGY STAR regulations. By adjusting any one or more of these four factors allows us to meet the new ENERGY STAR criteria.

 

Get Comfortable– ENERGY STAR windows can help create a consistent temperature throughout the house.
Reduce Your Carbon Footprint– With ENERGY STAR windows, you will use less energy, which reduces greenhouse gas emissions from power plants.
Reduce Your Carbon Footprint– With ENERGY STAR windows, you will use less energy, which reduces greenhouse gas emissions from power plants.
Protect Your Furniture and Floors– Many ENERGY STAR windows have a special coating on the glass that’s like sunscreen for your house.