"If you shop around, you can find high efficiency, Energy Star-rated replacement windows that come with 20 years to lifetime warranties that fit your budget."
Compared to a few, short years ago, replacement windows are much more affordable, and if you're looking for a budget-friendly way to keep your heating and cooling costs as low as possible, then consider having your windows replaced with energy-efficient ones.
Read the entire article: "Replacement Windows: Energy Efficient and They Fit Your Budget."