A Homeowner’s Guide to Window Efficiency Ratings
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Understanding the Numbers Before You Buy
Energy efficiency is one of the most important things to understand before buying replacement windows, and it can also feel like the most intimidating. In East Central Indiana, your windows deal with freezing winters, muggy summer afternoons, wind, rain, and temperature swings that would expose any weak frame or poorly sealed glass in a hurry.
The good news is that you don't have to guess. Every properly-rated replacement window comes with measurable numbers that explain exactly how it performs. Those numbers appear on the National Fenestration Rating Council label, usually called the NFRC label, and they give you a fair, standardized way to compare one window to another.
Clemens Home Solutions is here to break down the four main ratings, explain why they're relevant, and show you how our windows stack up against ENERGY STAR® requirements.
More Info About Our Replacement Windows
How Windows Are Tested & Rated
The National Fenestration Rating Council is an independent organization that tests and rates windows using consistent, standardized measurements. ENERGY STAR certification is built on those same measurements, so one label tells you everything you need to know about both. Instead of relying on marketing language or price alone, you get a concrete look at how a window performs before it's ever installed in your home.
The four ratings worth understanding are:
U-Factor
Solar Heat Gain Coefficient, also called SHGC
Visible Transmittance, also called VT
Air Leakage, also called AL
Each one measures something distinct. U-Factor indicates how well a window insulates. SHGC tells you how much solar heat passes through the glass. VT covers daylight transmission. AL tracks how much air can pass through the window assembly itself. Together, these numbers give you a practical picture of how a window will affect heating costs, cooling demand, and everyday life in your home.
The 4 Main Performance Ratings
U-Factor: The Insulation Rating
U-Factor measures how much heat the entire unit allows to pass through it, including the glass, frame, and spacers. It's rated on a scale where lower numbers reflect better insulation.
ENERGY STAR Requirements
For ENERGY STAR certification in Indiana, a replacement window must have a U-Factor of 0.30 or lower. Anything above it may not provide the performance that East Central Indiana homes typically need. Anything below it exceeds the minimum and provides better insulation.
The Clemens Standard
Our replacement windows reach a U-Factor as low as 0.23, which is about 30 percent better than the ENERGY STAR threshold for Indiana. While that number highlights how much heat stays inside, it also prevents muggy humidity from radiating into your living room.
Solar Heat Gain Coefficient: The Solar Control Rating
Solar Heat Gain Coefficient measures how much solar heat passes through a window's glass. Like U-Factor, it's measured on a scale from 0 to 1.
ENERGY STAR Requirements
ENERGY STAR requirements for SHGC can shift depending on a window's U-Factor. As a general target for this region, an SHGC of 0.42 or lower is a solid benchmark. That keeps summer heat gain in check without sacrificing daylight benefits.
The Clemens Standard
At an SHGC of 0.20, our windows go considerably further than Indiana's recommended benchmark. By blocking the vast majority of solar heat radiation, they also help protect your hardwood floors, carpets, and furniture from fading in the sun.
Visible Transmittance: The Daylight Rating
Visible Transmittance measures how much natural light passes through the glass. On a scale from 0 to 1, the higher the number, the more light filters into your home.
ENERGY STAR Requirements
ENERGY STAR doesn't set a minimum for Visible Transmittance. That said, many homeowners prefer a rating of at least 0.40 for good daylight and a clear view outside. A well-built window should let the outside in without letting the weather follow.
The Clemens Standard
The VT rating on our windows comes in at 0.47, sitting comfortably above what most homeowners look for. Your rooms stay bright and connected to the outdoors while the glass does its job of managing heat transfer.
Air Leakage: The Draft Control Rating
Air Leakage measures how much air passes through one square foot of a window assembly under standardized conditions. Lower numbers reflect a tighter, better-sealed window.
ENERGY STAR Requirements
ENERGY STAR requires an Air Leakage rating of 0.30 or lower for certification. Anything above that threshold can allow noticeable drafts. A lower AL rating means the full window assembly holds tight under wind pressure and temperature changes, not just the glass itself.
The Clemens Standard
Replacement windows from Clemens Home Solutions have an Air Leakage rating of 0.01. That's one of the tightest numbers you'll find on a window label. It shows that the efficiency goes beyond what the glass package can do on its own.
Why the Details Around the Frame Matter
The NFRC label tells you what a window is capable of. Installation determines how much of that capability your home actually receives.
Even a high-performing replacement window can fall short if it's installed carelessly. Gaps around the frame, inadequate sealing, poor fit, or rushed workmanship can allow air and moisture to move in ways that undercut everything the glass was designed to prevent. The product and the process have to work together.
At Clemens Home Solutions, every window replacement includes a satisfaction sign-off completed by the installer and homeowner together before we consider the project finished. If something isn't right, it gets addressed on the spot. Our installers also undergo annual recertification to maintain consistent technical standards from one job to the next.
Replacement Windows Near Muncie & Beyond
Clemens Home Solutions provides replacement windows throughout East Central Indiana, with service focused on a roughly 50-mile radius of our Muncie showroom.
Communities we serve regularly include:
Muncie
Anderson
New Castle
Richmond
Noblesville
Hartford City
Gas City
Tipton
Delaware County
Madison County
We also review select projects outside that core area, depending on location and scope. If your city isn't listed, it's worth reaching out to check availability. To see all the communities we cover across East Central Indiana, visit our service areas page.
Frequently Asked Questions
U-Factor is the one to watch most closely for winter comfort. It reflects how well the full window unit insulates and how much heat it allows to escape. For Indiana, ENERGY STAR requires a U-Factor of 0.30 or lower.
The Solar Heat Gain Coefficient is the key metric when a room overheats due to direct sunlight. It captures how much solar heat enters through the glass, and a lower reading means less unwanted warmth on hot afternoons.
ENERGY STAR certification means a window meets the minimum efficiency standards for its climate zone. Indiana is in the Northern zone, so emphasis is placed on insulation performance.
Yes. Financing is available and can be discussed during your estimate. This is especially helpful for homeowners replacing multiple windows at once or planning a broader exterior project.
See the Window Behind the Rating
Reading ratings is useful, but seeing a window in person makes the decision much easier. Our showroom in Muncie gives you a place to look at your options, ask questions, and connect the numbers on the NFRC label to the products you'd choose for your own home.
If your windows are drafty, difficult to operate, fogged between the panes, or no longer keeping your interior temperatures steady, contact Clemens Home Solutions to schedule your free replacement window estimate in East Central Indiana.
FINANCING OPTIONS AVAILABLE
Flexible payment plans to fit your budget.
It’s About P.R.I.D.E.
Everything we do is rooted in our 5 Core Values. These values provide the foundation on which our company is built—the unwavering principles we abide by to ensure YOU amazing remodeling results. There’s a reason 70% of our business comes from repeat customers and referrals!
We hold ourselves unconditionally accountable for your project and experience. We take ownership of our actions, even when no one is looking or will notice.
We forge strong connections with others, whether it’s customers, vendors, or team members. The stronger the bond, the better YOUR results.
Honesty isn’t the best policy—it’s the ONLY policy. We do what we say, follow through on promises, and provide transparent communication without exception.
This is our ironclad commitment to you that we’ll give 100% effort each and every day. Working hard, earnestly, and with impeccable attention to detail is our calling card.
We WILL perform our job to the highest possible caliber. But we understand that excellence isn’t static. That’s why we constantly strive to improve and grow.
Our Certifications
Check Out Some Of Our (Many) 5-Star Window Installation Reviews
We couldn’t be more pleased with the windows that we purchased from Clemens or the impeccable service provided by their employees. Originally we replaced only 7 windows, but they made such an improvement, (as seen in the picture below) the new window on the right compared to the left, we will need to order more windows for symmetry and curb appeal. Because of their high quality and outstanding service, we would not hesitate to recommend any of this company’s services and products. They strive to please you, the customer, with their professionalism and business integrity. Thanks again Clemens!
From start to finish Clemens was very professional, respectful, and timely. The crew of men who installed my windows were very kind, respectful, and professional. They did an excellent job and made sure I was satisfied before they left. My windows look amazing, and I’m very happy with the results. I would highly recommend Clemens Home Solutions to anyone who is needing home exterior projects. I will definitely use them for the next project at my home!
We hired Clemens Home Solutions. The workmen installed two windows & window sills and then wrapped them in white aluminum. They tore down the siding on the gable end of the garage and replaced it with new vinyl siding. The workers were very friendly, helpful, and respectful of our property.
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