Will New Windows Actually Lower My Energy Bills?

Yes, meaningfully — especially in Seattle's older housing stock, where single-pane windows are still common. Replacing single-pane windows with double-pane low-E glass can reduce heating and cooling costs by up to 40%. The bigger the temperature differential between inside and outside, the more you'll notice it.

For Seattle specifically, look for windows with:

• Double or triple pane with argon or krypton gas fill
• Low-E coating to retain heat in winter without blocking natural light
• U-factor of 0.30 or lower (the lower, the better for cold climates)
• ENERGY STAR certification (required for most rebate programs)

Window replacement consistently ranks in the top five home improvement projects by return on investment. In Seattle, vinyl window replacement has an estimated 81.6% ROI — meaning a significant portion of the project cost comes back when you sell.