Windows

In a warm climate like Northern California, single pane windows can add 10-15% to your energy bill. You should strongly consider replacing those windows with dual pane glass.

Here are some tips on shopping for new windows:

1. Look for the ENERGY STAR and Energy Guide labels. Also, look for the National Fenestration Rating Council label, it signifies that the performance of the windows is certified.
National Fenestration Rating Council
2. Consider spectrally selective coatings that reduce heat gain.
3. Look for a U-value of .35 or below, and look for air leakage of .3 cubic feet per minute or less.
4. Make sure that your windows are installed by a qualified contractor to avoid air leakage and the maximum useful life of your windows.

The following tips can help to improve the energy efficiency of any window:

1. Install white window shades, drapes, awnings, reflective films or blinds to reflect heat away from the living spaces of the home, especially on south and west facing windows.
2. Keep windows on the south side of your home clean and free of blockage from vegetation, etc, to maximize the heat gain during the winter.
3. Close curtains and shades at night and open them during the winter, and reverse the process in the summer months.

Windows are not only key to the energy savings of your home, but they are key design elements as well. For your best results, seek the advice of a contractor/designer who will consider all aspects of a window upgrade to maximize the energy savings as well as the aesthetics of your windows.