Energy Efficient Windows

When Buying:cutout of an energy efficient window

  • Installing new windows can be expensive. Determine whether it will be more cost effective to invest in new energy efficient windows or to make energy upgrades to existing windows.
  • Determine your Climate Zone to know the window requirements for maximum energy efficiency in your climate.
  • Look for ENERGY STAR certified windows for your climate zone.

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Improve Energy Efficiency of Existing Windows

Window Treatments

  • Drapes and Shades can be closed on summer days to reduce heat gain (up to 33%) and on winter nights to reduce heat loss (up to 10%).

Window Inserts

  • Custom-fit panels placed on window interiors can drastically increase the thermal efficiency of single-pane and double-pane windows.
  • Affordable and easy to install and remove.

Seal Air Leaks

  • Caulk is used to seal air leaks through cracks, gaps, or joints less than 1/4 inch wide between stationary building components and materials.

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Office of Sustainability
312-314 Corbett Hall
Orono, Maine 04469-5774
Tel: 207.581.1571