New windows are one of the bigger checks most homeowners write, so it's fair to ask what you get back. Window companies often answer with big promises: "cut your energy bill in half!", "pays for itself!". This article gives you the real numbers: what new windows add to your home's value, what they save on energy, and the less obvious payoff, which is how much longer everything else in your home lasts.
How many windows are you thinking of replacing? The estimates in this article are worked out for 10 windows, the project size used in the Cost vs. Value Report. Enter your own rough number and the figures below will update as you read.
Benefit 1: They add to your home's value
The best independent measure of what remodeling projects add at resale is the annual Cost vs. Value Report, which surveys real estate professionals on how much specific projects add to a home's resale value.
In the 2025 report for Chicago, replacing ten 3'×5' double-hung windows with ENERGY STAR vinyl windows was estimated to add $17,992 to a home's resale value. That's about $1,800 per window.1
The value a new window adds doesn't depend on what you paid for it. A buyer looks at the windows, not your invoice. That makes the price you pay the biggest factor in your return.
The report's average cost for those 10 double-hung windows was $21,941.1 A whopping $2,194 a window! That is more than double what we typically charge per window, and we perform a higher level of craftsmanship!
The same report found a new steel entry door is estimated to add more to a Chicago home's resale value than it costs.1 If you're replacing windows, it's worth pricing the front door at the same time.
There's also a benefit the report can't measure: selling faster and with fewer surprises. Fogged glass, rotted sills and windows that won't open are the kind of thing home inspectors flag and buyers use to negotiate. New windows take that off the table, and they show up in listing photos.
For 10 windows, that increases the value of your home by an estimated $17,992.
This is not a claim about guaranteed return on investment, but an estimate based on available sources.
Benefit 2: Lower energy bills (realistic numbers)
Windows are a big part of your heating and cooling load. Heat gain and loss through windows is estimated at 25–30% of residential heating and cooling energy use.2 So better windows do save energy. The question is how much.
What the reliable sources say
- ENERGY STAR: replacing poor-performing windows with ENERGY STAR certified windows can save an average of about 12% a year on energy costs. The figure varies by climate.3
- Consumer Reports, for the Northern climate zone that includes Chicago: replacing 10 single-pane windows saves an average of about $568 a year (12%). Replacing 10 older double-pane windows saves about $282 a year (6%).4
So for a typical Chicago-area home, a realistic expectation is a few hundred dollars a year. You'll land at the high end if you're replacing single-pane or badly leaking windows, and at the low end if your current windows are double-pane and in fair shape.
About the bigger claims
You'll see claims of 25%, 40% or even 50% savings. Those numbers usually come from something narrower than your total bill. For example, one widely repeated line says ENERGY STAR windows and storm windows can reduce heat lost to air leaks by 25 to 50 percent.5 That may well be true for leak losses alone. But air leaks are only part of your heating bill, and heating is only part of your energy bill. Double-digit savings on your total bill can happen in a very leaky home with single-pane windows. For most homes, don't count on it.
The honest payback math
Consumer Reports puts a typical professionally installed window at around $800 nationally.4 Ten windows at that price, saving $568 a year, would take roughly 14 years to pay back on energy alone, and longer if you're replacing double-pane windows. That's why we never tell anyone to replace windows only to save energy. Count the energy savings as one return among several, alongside resale value and the benefits below. The federal tax credit for windows ended after 2025, but some utility and local programs remain.
In addition to the $17,992 in added value, you may save about $568 per year on energy. Over the next 10 years, those combine to an estimated $23,672.
This estimate assumes you are replacing single-pane windows. This is not a claim about guaranteed return on investment or energy savings, but an estimate based on available sources.
Benefit 3: Everything else in your home lasts longer
This is the benefit few people think about. Old, leaky, single-pane or failed windows aren't just costing you energy. They're slowly wearing out other things you paid for.
Floors, furniture, rugs and art
Sunlight fades hardwood floors, carpets, upholstery, blankets and paintings. Ultraviolet rays are the main culprit, and ordinary glass blocks only some of them. The low-E coatings on efficient windows block 75% of the UV that gets past ordinary glass, and UV-absorbing materials can raise protection to 99%.6 Visible light and heat still cause some fading, so new windows slow it rather than stop it. But slowing it is the difference between a sun-bleached floor in five years and one that still matches the rest of the room.
Curtains, blinds and window treatments
The same UV protection helps the fabric hanging right next to the glass. Treatments last longer before they fade, yellow or go brittle. With less condensation on the glass, there's less moisture on blinds and on curtains that touch the window.
Window sills, trim, paint and drywall
Condensation forms when the inside surface of the glass is colder than the room air.7 Single-pane and failed double-pane windows run cold. In a Chicago winter, that water runs down onto sills and trim night after night. Over time it peels paint, stains drywall and rots wood, and it can feed mold and mildew.7 New insulated glass with a warm-edge spacer keeps the inside surface warmer, so there's much less condensation in the first place.
The walls themselves
Worn-out windows can let water into your walls, along with insects and pests.3 Water in a wall cavity is the expensive kind of problem: rotted framing, damaged insulation and mold you don't see until it's serious. A properly flashed, sealed and insulated installation is the best defense, and it's why installation quality matters as much as the window.
Your furnace and air conditioner
Drafty windows make your heating and cooling system work harder to hold a steady temperature.5 A tighter, better-insulated home means shorter run times and less strain, and with that, less wear on the equipment. One practical tip: if you're replacing your furnace or air conditioner after new windows, ask the HVAC contractor to do a load calculation rather than matching the old unit's size. A tighter home may need less capacity.
Your exterior paint and maintenance schedule
Wood window exteriors need scraping, painting and caulking every few years. Vinyl and clad windows don't. That's maintenance time and money back, every cycle, for as long as you own the house.
Benefit 4: Comfort, quiet and everyday ease
- No more cold spots. Drafty windows are uncomfortable to sit near on a cold, windy day.3 Better windows make the whole room usable year-round.
- Less outside noise. Insulated glass and good seals cut street, traffic and neighbor noise.
- Windows that actually open. Fresh air on a nice day, and ventilation that can cut cooling costs.3
- Easy cleaning. Tilt-in sashes let you clean the outside glass from inside.
- Better security. Modern locks and sashes that close tight.
Putting it together: your estimated return
Here's how the numbers add up for your home over the next 10 years, compared with what the project might cost:1, 4
For 10 windows over 10 years: an estimated $17,992 in added home value plus about $5,680 in energy savings, for a combined estimated benefit of $23,672.
At the report's average price of $2,194 a window, 10 windows would cost about $21,941, so the estimated benefit is more than the cost even at that price. At half the report's average, about $1,097 a window, the project would cost about $10,970, and the estimated benefit would be more than double the cost.
Added value is realized when you sell; energy savings arrive a little each year. This estimate assumes you are replacing single-pane windows. This is not a claim about guaranteed return on investment or energy savings, but an estimate based on available sources.
And that's before counting the benefits that don't fit in a calculator: floors and furniture that don't fade, sills and drywall that don't rot or stain, a furnace that runs less, and rooms that are comfortable and quiet every day you live there.
Your numbers will depend on your home, your current windows and your local prices, so treat this as a guide, not a guarantee.
When you should not replace your windows
New windows aren't always the answer. If yours are double-pane, the seals are intact (no fog between the panes), the frames are solid and they open and lock properly, you may get more for your money from new weatherstripping, caulking or repairs. We'll tell you if that's the case.
Frequently asked questions
Do new windows increase home value?
Yes. The 2025 Cost vs. Value Report for Chicago estimates that replacing ten double-hung windows with ENERGY STAR vinyl windows adds about $17,992 to resale value, or roughly $1,800 per window.1
How much will I save on energy with new windows?
Most homes save a few hundred dollars a year. ENERGY STAR estimates about 12% on average when replacing poor-performing windows.3 Consumer Reports estimates about $568 a year for 10 single-pane windows in a Northern climate, or $282 for 10 double-pane windows.4
Do new windows pay for themselves?
Rarely on energy savings alone. Counting resale value, protection for your home's interior, avoided repairs and comfort, they're often a sound investment, especially if your current windows are single-pane, fogged or rotting.
Is it worth replacing double-pane windows?
It is if the seals have failed, the frames are damaged or the windows don't operate well. If they're in good shape, the energy savings alone are modest.4
Find out what new windows would do for your home
We'll look at your current windows, tell you honestly whether they need replacing, and give you a written, fixed price with no deadline. Request a free, no-pressure consultation or call (773) 964-4260.
Sources
1. Zonda Media — 2025 Cost vs. Value Report, Chicago, IL
2. South Carolina Energy Office — Energy Saver: Windows
3. ENERGY STAR — Windows Fact Sheet (2024)
4. Consumer Reports — Replacement Windows Buying Guide
5. Constellation — Replacing Windows for Energy Savings
6. Efficient Windows Collaborative — Protect Your Art and Furniture
7. Efficient Windows Collaborative — Condensation