Feeling the chill this winter? It could be your windows.

In cold climates like Seattle's, an estimated 40 to 50 percent of household heat is lost through windows, mainly in winter months. No matter how you look at it--environmentally or economically--it's a waste. At a national level, the energy lost through residential windows costs U.S. consumers about $25 billion a year. And the energy wasted roughly equals the energy in the oil delivered annually through the Alaska pipeline.

Luckily, there are many ways to keep heat inside while still enjoying your beautiful view. Ready to trim your heating bills while conserving energy? Follow these tips:

Cover up:
It's the simplest fix: Blinds, curtains, and window coverings all protect against heat loss, so cover windows at night and when you're away from home.

Check up: 

Are the seals around your windowpanes in good condition? Do a simple test by putting the back of your hand a few inches away from the edge of a window. While it's normal for air to feel a little cooler near the glass, any air movement or draft means it might be time to repair or replace the caulking or weatherstripping lining a window. 

Trade up: 
Installing new windows gives you the chance to opt for maximum efficiency. Look for double- or triple-paned glass, manufacturer-warranted seals, and fusion-welded joints between pieces of the window's frame. One easy tip is to look for the Energy Star logo when shopping. Penguin Windows and Keystone Windows and Doors are two local companies that specialize in replacing or repairing residential windows.

According to Koben Calhoun, program manager at Built Green, "The up-front cost of well-insulated windows is a great investment in the energy efficiency and overall comfort of your home--and in reducing our impact on the world around us." 

Need more information? Check out the Built Green or Seattle City Light websites. Download a guide to Energy Star windows here. For more easy ways to conserve heat in the home, see our Temperature Control tip!