Windows are an integral part of your home’s overall design and heating, cooling, and lighting system. However, if your windows are not energy efficient they can negatively impact your home’s energy efficiency. 

There are two things you can do to improve your home’s energy efficiency and lower your heating/cooling bills.

The first one is improve the energy efficiency of existing windows by adding storm windows, caulking and weatherstripping, and using window treatments or coverings.

The second one is to select new energy-efficient windows. Purchase replacement windows with an ENERGY STAR® rating. Even though they may be more expensive, they will pay for themselves in the long run. ENERGY STAR bases its qualification on U-factor and solar heat gain coefficient ratings. These energy performance characteristics measure and rate the following properties:

Heat gain & loss through:

  • Direct conduction through the glass or glazing, frame, and/or door
  • The radiation of heat into a house (typically from the sun) and out of a house from room-temperature objects, such as people, furniture, and interior walls
  • Air leakage through and around them.


Call Gravina’s for more information on energy-efficient windows. We can help you understand ENERGY STAR ratings and how to select new windows for your Denver home.