Benefits of replacing old windows with ENERGY STAR® windows

Do you find yourself avoiding certain rooms in your home on sunny days because they’re too warm? Do you need a blanket while sitting by your windows when it’s cold outside? At this point, you may be so accustomed to your home’s quirks that you no longer think about whether your windows are doing their job.

However, the reality of window energy efficiency becomes clearer when it comes time to pay your energy bills during the heat of the summer and the chill of the winter. These are the seasons when your heating and cooling system is more likely to be working overtime due to failed seals, window damage from moisture, or simply age.

An energy-efficient replacement could keep you more comfortable while lowering energy bills. Because ENERGY STAR windows are designed to prevent the transfer of heat through them, the temperature inside your home will remain consistent.

Another big reason why energy-efficient windows are a smart investment is that they can help boost your home’s resale value. Potential buyers love new windows because it’s one less project to think about. As a result, you can often recoup some of the investment you made in your windows when it's time to sell.

Secondly, many homebuyers look closely at a home’s energy bill history to get an idea of what they’ll be paying each month. When they see lower bills thanks to energy-efficient windows, it can be a strong selling point and possibly even the reason they decide that your home is the one.

One of the main ways energy-efficient windows help keep monthly bills low is through ENERGY STAR-rated features designed to prevent heat loss and gain. For example, the type of window glass you choose can make a big difference. Many ENERGY STAR windows use low-emissivity (Low-E) coatings, which are available at different performance levels to accommodate a range of climates.

Having a Low-E3 coating on a window can improve energy efficiency by up to 70%. Its thin, metallic layer reflects UV rays and blocks excess solar heat, helping keep your home cooler during the summer months and reducing your reliance on air conditioning. This can translate to energy savings of up to 13% on your monthly energy bills, according to ENERGY STAR savings estimates.²

However, the benefits of Low-E coatings go beyond energy savings. Furniture, flooring, and upholstery can fade over time due to damaging UV rays that easily pass through single-pane window glass. ENERGY STAR windows help limit UV exposure while still letting natural light in, preserving the longevity of your valued belongings.

Because lower energy use in homes contributes to the overall production of greenhouse gases and carbon emissions, there are often home improvement incentive programs offered by federal and state governments. These tax rebate incentive programs often focus on improvements and materials that meet ENERGY STAR’s “Most Efficient” designation, according to the climate zone you live in.

For example, to qualify for a tax rebate with the most recent program, which ended in December 2025, your whole-home window replacement would have needed to use triple-pane Low-E2 coated windows, as these were the only type of windows that met the requirements. Plus, the manufacturer of the windows would have to opt into the IRS program.

It’s important to note that an ENERGY STAR rating label alone does not equate to qualifying for tax savings. No matter what home improvement project you are undertaking, it’s the responsibility of the consumer to research whether the materials used will qualify for tax rebates. While tax rebates up to $600 are a nice perk, homeowners should choose the window and glass type that best suits their climate, energy-efficiency goals, and overall budget.

Even if your home had ENERGY STAR windows installed in the past, you could still benefit from upgrading to newer models. ENERGY STAR rating guidelines have been updated to Version 7.0, to reflect the latest energy efficiency standards and performance data.  Newer windows are often designed to meet these stricter requirements, which means better insulation and greater energy savings for today’s homes.

Looking to maximize those savings even further? The style of window you choose also matters, so take this renovation as an opportunity to switch your existing style to one that seals better when closed. Casement and awning windows are among the most energy-efficient options because of their unique design. Since they close tightly against the frame and seal toward the home, wind pressure helps strengthen the seal rather than weaken it, thus keeping your indoor temperature more consistent.

Time to learn more about energy-efficient windows?  Schedule a free, no-pressure consultation with your local Infinity by Marvin expert.  

¹ _{https://www.energy.gov/energysaver/update-or-replace-windows U.S. Department of Energy. (n.d.). Update or Replace Windows. Energy.gov. https://www.energy.gov/energysaver/update-or-replace-windows}

² _{Methodology for ENERGY STAR Savings Estimates for Windows. (2022). ENERGY STAR. https://www.energystar.gov/products/res_windows_doors_skylights/methodology-energy-star-savings-estimates-windows}