Replacement Home Windows: Ten Things You Should Know

Windows are a big decision whether you're planning your dream home, remodeling with replacement home windows, or simply tired of desert summers or north country winters. Investing in the best windows can take up to twenty years to pay off with utility savings, but resale value, freedom from maintenance and leaky construction, and reduced home temperature swings begin immediately.

Investing in the Best Windows

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  1. Annual utility savings compared to single pane glass with leaking frames can be 10 to 25 percent.
  2. Government tax credits for Energy Star-rated windows are available through 2010. If you won't start building until 2011, purchase the windows in advance to take advantage of the rebates.
  3. Expect to pay $7,000 to $20,000 for an average home, more if you need custom sizes.

Features of Excellent Exterior Windows

  1. Even the best windows are only as good as their installation quality. Some manufacturers such as Andersen require their own certified installers. If you have to hire your own installers, look for those who are certified by the American Window & Door Institute. Insist that they follow guidelines strictly, whether for new or replacement home windows.
  2. Resistance to rain and humidity is best in top quality fiberglass windows or wood windows clad with vinyl or aluminum on the exterior side.
  3. In high wind areas, hurricane-rated windows have a membrane sandwiched between the panes, much like a car windshield, that in essence keeps glass shards from becoming shrapnel. Anchoring of the frame is crucial, as is a wind-resistant garage door, to protect the home's shell.
  4. In testing by Consumer's Union, certain windows by Marvin, Alside, Crestline and Pella had superior durability ratings, even when, with some styles, other factors were not as highly-rated.
  5. Energy efficiency of windows is rated by U-factor (the ability to keep your home warm in winter and cool in summer.) Look for U-factors of .28 to .34.
  6. Solar heat gain coefficient (SHGC)--is another rating system. It tells how much of the sun's heat makes it into your home. Look for a SHGC more than .55 in cold climates, less than .40 in hot climates.
  7. Multi-pane windows increase efficiency. Double or triple-paned glass windows filled with an inert gas such as krypton and with clad-wood or fiberglass insulated frames are tops.

National Fenestration Rating Council (NFRC) energy performance labels rate U-Factor, SHGC, plus air leakage, visible transmittance, and condensation resistance. Look for these labels. Learn the best ratings for your climate when you start shopping for the best new or replacement windows.