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Is replacing windows worth it for the energy savings?

By Gregory Brown · Updated October 19, 2026

On energy savings alone, replacing windows usually takes decades to pay back. The exception is windows that need replacing anyway: then only the extra cost of ENERGY STAR windows counts, and that can pay back far sooner. Here is what decides it, state by state.

What decides the savings

The windows you have now. Replacing single-pane glass saves more than replacing double-pane; the table shows how much more in each state. The U.S. Department of Energy puts the savings from replacing single-pane windows at roughly $126–$465 a year.

Your climate. Window savings vary most with climate, so they come from the most applicable manual nearest you, among those with window figures: the Arkansas, Texas, New Mexico, Massachusetts, Minnesota or California manual. In the Pacific Northwest (Idaho, Montana, Oregon, Washington and Wyoming) they come from the Regional Technical Forum's and the Bonneville Power Administration's per-square-foot figures for the way your home is heated, priced at your state's electricity and fuel rates. National figures based on DOE's guidance cover the rest: Alaska, Delaware, the District of Columbia, Hawaii, Maryland, New Jersey, New York, Pennsylvania, Virginia and West Virginia. The table's last column names the source for each row.

Your heating and cooling. Outside the Pacific Northwest, the manual's figure is applied to what you spend on heating and cooling: measured from your own bills where they allow it, or your state's typical split where they don't (how it's measured). It is calibrated so that a home with its state's typical split saves what the manual implies, and a home that heats and cools more saves more. Window savings really follow the area of glass, so for unusually high heating and cooling bills this can overstate them.

What it costs

Replacing every window in a house is expensive. For the example home in Georgia, the ladder's cost range is $7,950–$14,133, adjusted to Georgia's costs with RSMeans city cost indices. That is why the payback runs to decades.

If your windows need replacing anyway (rotted frames, failed seals), the fair comparison is ENERGY STAR windows against standard new ones. The ladder then counts only the extra cost, before the adjustment to your area's costs: $450–$1,200 for about 200–300 sq ft of glass, from the Illinois manual ($800–$1,200, from Vermont's, in New England, Delaware, the District of Columbia, Maryland, New Jersey, New York, Pennsylvania, Virginia and West Virginia). It also counts about half the savings, because standard new windows are already better than old ones.

By state

The table runs one house: the example home from the example ladder, a 1960s single-family home with gas heat and central air that spends $2,600 a year on energy ($1,900 of electricity and $700 of gas). Each row moves that same house, with the same bills, to another state. What changes from row to row is where the window figures come from (the last column), how the example home's heating and cooling compares with a typical home's in that state, the state's construction costs and, in the Pacific Northwest, its energy prices. Your own bills will move the figures, up or down.

Replacing the windows with ENERGY STAR windows: yearly savings and simple payback for the example home, in each of the tool's state choices. Replacing anyway: windows that are double-pane now

Simple payback is the middle of the cost range divided by the yearly savings. Savings are for the upgrade on its own; on a full ladder, each rung counts what's left after the rungs before it (how the ladder counts overlap). Calculated with the tool's October 2026 prices.

Your own numbers

Your windows, your bills and your climate decide your figure. The Upgrade Ladder works it out from your own bills, and puts windows where they belong among the other upgrades: usually after air sealing and attic insulation, which save more per dollar.

Build your ladder How the estimates are made

Sources

• Window savings by climate: Arkansas TRM 10.1, Texas TRM v13.0, New Mexico TRM 2025, Massachusetts TRM 2025–2027, Minnesota TRM v5.0 (2027 edition), California eTRM (2026 cycle).
• Pacific Northwest windows: Regional Technical Forum single-family weatherization workbook v7.2; Bonneville Power Administration unit energy savings list (April 2026).
• Costs: full replacement from the Illinois Statewide TRM v14.0's early-replacement default and the U.S. Department of Energy's Scout window cost, brought to current dollars with the Bureau of Labor Statistics consumer price index; the ENERGY STAR premium, when you're replacing windows anyway, from the Illinois Statewide TRM v14.0 and Efficiency Vermont TRM 2024; all adjusted to your area with RSMeans city cost indices.
• Single-pane savings range: U.S. Department of Energy guidance.
• Typical heating and cooling shares, for applying the manuals' figures to heating and cooling: EIA Residential Energy Consumption Survey (RECS 2020).
• Energy prices: U.S. Energy Information Administration (EIA).
• Every step in detail: how the estimates are made.

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