Seven things to know before replacing windows

FALLBROOK – The decision to replace windows often comes down to aesthetics and necessity. Drafty windows can reduce energy efficiency in a home, requiring HVAC systems to work harder to keep interiors comfortable. The harder the HVAC must work, the more homeowners will pay in energy costs.

Old windows also may be points of entry for water and insects. Despite the importance of windows, Money magazine advises that new windows make up only a fraction of the home's total exterior "envelope," resulting in only about 5 to 15% of total energy savings.

But there are still plenty of reasons to invest...