More on windows (why you shouldn’t replace them for increased energy efficiency)

In a previous blog post I wrote an explanation of how replacing your windows was not the smartest way to spend your energy efficiency budget. Green Building Advisor, a wonderful, comprehensive website on all things green-building related, has published an article that backs me up on it.

Here’s what they say:

Window replacement isn’t the best place to start in energy upgrades. When planning energy improvements to an existing house, replacing windows should show up toward the bottom of the list. It almost always makes sense to improve an existing home’s air tightness and add insulation to the attic and basement. Replacing an old furnace or refrigerator can also be cost-effective. But if the windows work well, it’s usually best to put replacing windows lower on the list. In a cold climate, the best way to improve single-glazed windows is to install exterior storm windows with low-e glass.

Now, note that they don’t say that windows don’t matter at all. In new construction it’s very important to consider types of windows as well as installation methods for energy efficiency. But they are saying that replacing existing windows, even replacing single-pane windows with double, low-e windows, does not pay off in the long run. There are better ways to spend your money.