Consider replacing single-pane windows with new, energy-efficient, double-paned windows. They reduce heat loss through windows by 50 percent to 75 percent. (But keep in mind that insulation should come first; it will save more energy.)
Window tips
Look at energy ratings.
Check National Fenestration Rating Council rating or look for the ENERGY STAR® logo. You can also find information on these websites:
You can earn cash back. Energy Trust cash incentives are available for new windows if the windows are installed together with a second complete qualifying energy-saving measure. You might also be eligible for a federal tax credit.
Consider window film.
If your budget doesn’t allow for new windows, you might consider energy-efficient window film. Newer film products look clear but have a low-emissivity coating to block the sun’s rays in summer and keep heat inside in winter. The film can also be a good idea for places where drapes can’t be installed or operated well, like clerestories or skylights.
Temporary, plastic storm window kits can help.
These easy-to-apply kits — sometimes called “window insulation kits” — are not as energy-efficient as new windows, but they are a budget-conscious short-term option for cutting drafts and saving energy. Make sure temporary kits are installed tightly to prevent moisture problems.