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Your Replacement Window Performance Rating Explained

Performance Ratings

When you’re buying a big-budget item, it’s easy to get lost in a sea of information. You want to make sure that you’re getting the value for your money, and that your product is going to last you a long time. When buying replacement windows, the best way to do this is to check for a performance rating or Energy Star certification. Replacing old windows with Energy Star-certified windows lowers household energy bills by an average of 12% nationwide. Energy Star ensures quality by holding window manufacturers to strict performance standards on 5 different categories set by the National Fenestration Rating Council. Standards vary on your climate zone. Here in Illinois we are in the Northern Climate Zone, so those standards have an emphasis on durability and insulation. Luckily, most window manufacturers don’t try to hide their performance ratings and windows come with a label. They look like this:

Replacement Window Label

The label looks confusing, but I’ll explain it to you step-by-step.

Performance Rating: U-Factor

The U-Factor measures your the window’s rate of heat loss. Specifically, it measures the rate of heat flow through your glazing system. U-Factors generally range from 0.25 to 1.25 and are measured in Btu/h·ft²·°. Don’t worry, the units don’t matter much to anyone but the manufacturers. All you need to know is that low U-Factor is preferable because it means less heat loss, which is a good thing! A low U-Factor means better insulation and energy efficiency. Illinois winters can be brutally cold and even a small amount of heat loss can make your home feel drafty. To be eligible for the Residential Energy Tax Credit (worth 10% of the product cost up to $200), your window must have a U-Factor equal to or lower than 0.30 for those living in Illinois.

Take Preservation Window’s EnergyMaxx 10 Elite glass package as an example. Most standard replacement window units  have a U-Factor of 0.48. Our EnergyMaxx 10 Elite glass package has a U-Factor value of 0.17, meaning it performs 65% better than its competitors.

Performance Rating: Solar Heat Gain Coefficient (SHGC)

The Solar Heat Gain Coefficient (SHGC) measures the fraction of solar radiation that is transferred through your windows. While the U-Factor measures heat leaving your home, the SHGC measures the amount of heat entering your home. This measurement is especially pertinent in cool seasons. SHGC is measured on a scale from 0 to 1 but most windows have a SHGC values ranging from 0.25 to 0.80. A lower SHGC is preferable because it means less heat is entering your home. During a balmy Illinois summer, this could mean using less AC to cool your home.

We’ll use our EnergyMaxx 10 Elite glass package as an example again. Most traditional clear, insulated glass units have an SHGC of 0.50. Our EnergyMaxx 10 Elite glass has a SHGC of 0.17, meaning it outperforms the other glass package by 66%. Less heat enters a home through our windows with a low SHGC, and our replacement window customers will spend less money cooling their home.

Performance Rating 3: Visible Transmittance (VT)

Replacement Window Light

This rating seems straightforward, but it’s not. VT measures the amount of UV energy that your window allows through. VT can also measure how much visible light passes through your windows. This is where it gets tricky. You WANT an abundant amount of light to pass through your windows to give your home that natural, open character. However, UV energy is responsible for the fading of carpets, hardwood flooring, fabrics and furniture. In addition, to much light can cause glare. VT is measured on a scale of 0 to 1, but values generally range from 0.20 to 0.80.

Our EnergyMaxx 10 Elite glass package has a VT of 0.36 compared to a traditional clear glass package VT of 0.55. This means that the house with traditional windows will be brighter, and will also allow more UV radiation to enter the home. The house with the EnergyMaxx glass package will still have an abundance of visible light inside, but will not suffer the same fading damage as the other home.


Peoria Siding & Window has a number of different glass packages to choose from, all with different performance ratings. Make sure that when you’re choosing a replacement window, you prioritize factors like energy loss, heat gain and visible light. If you’re still confused about window performance ratings, don’t worry. One of our salespeople will be happy to talk you through any questions or concerns. Just call (309) 717-0105 to speak with a representative. If you’re looking to purchase new replacement windows, you can claim up to 30% off your home improvement project by filling out this form. We sell windows with an unbeatable performance at a value you can trust.

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Doors

Door Options


The Easy Way To A Beautiful Entryway
Your Paragon purchase comes complete, making it the easiest way to a beautiful entry. Our authorized dealers offer free, no obligation in-home consultation to provide you with a professional advice in selecting door style, finish, hardware and an accurate measurement for an exact fit.

ENERGY STAR Partner
Paragon Door Design is proud to offer ENERGY STAR qualified entry doors that meet rigid criteria for U-value and solar heat gain. Look for the ENERGY STAR label to save money on utility bills, increase the comfort of your home and help the environment.

Entry Doors



Build Your Custom Door

Steps For A Custom Door

  1. Choose Your Door Material
  2. Choose Your Door Style
  3. Choose Your Glass Collection
  4. Choose Your Door Finish
  5. Choose Your Hardware and Accessories

Door Materials

Door Styles

Entry-Door-Styles | Peoria-Siding-and-Window

Glass Collections

Paint Finishes

Stain Finishes

Sliding Patio Door



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Illuminations™ Patio Doors by Preservation are designed to provide full, unobstructed views of the outside while providing added light to your living space. A weathertight fit and powerful build provide best-in-class energy savings.

Warranty

Peace of mind. It should be the result of any good home remodeling project. Every Preservation Illuminations Sliding Patio Door is backed by a Lifetime Limited, Transferable Warranty to provide you with years of worry-free comfort. And because our warranty is fully transferable, it not only protects you, but also the resale value of your home. Plus, the warranty features an unparalleled non-prorated seal failure and glass breakage warranty. See printed warranty for complete details.

Exterior Color Options

Interior Color Options

Patio Doors



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Your backyard or deck can be easily graced by a stylish, secure Paragon door. Patio doors can be configured as a two door system with one operating door and one fixed door. Three door configurations consist of one operating door and two stationary units. Gardenview® doors are available in a variety of styles and make ideal replacements for sliding glass doors by adding a fresh, attractive appearance.

Classic Patio Door

Classic-Patio-Door | Peoria-Siding-and-Window

Three Door System

Three-Door-System | Peoria-Siding-and-Window

French Double Door

French-Double-Door | Peoria-Siding-and-Window

Storm Doors – Allure Collection



Color Options

Lockset

Brush Expander

Storm Doors – Harmony Collection



Color Options

Lockset

Brush Expander

Windows

Replacement Window Options


At Peoria Siding and Window, we are proud to offer our customers the best replacement windows on the market.

Our Preservation replacement window collection comes available in an array of interior finishes and exterior colors, glass options, styles and designs.

With beautiful, energy efficient windows, you’ll enjoy greater security and comfort with our Low E and Argon equipped Energy Star rated windows, savings on your energy bills, and years of worry-free performance.

Double-Hung



Double hung windows have a bottom sash that can be raised, and a top sash that can be lowered. Many double hung windows offer the added benefit of the sashes tilting in for easy cleaning. We offer a wide variety of screen, interior grid and color options. Preservation’s windows are beautiful, energy efficient windows.

Sliding



Sliding windows have one fixed window sash, and another that slides open from side to side. Unsurpassed energy efficiency, available with several “Low E glass” options. We offer a wide variety of screen, interior grid and color options.

Casement



Casement windows are hinged at the side, and open outward from either side. Casement windows are ideal for sunrooms and additions, as they offer view unobstructed by sashes and grids. Unsurpassed energy efficiency, available with several “Low E glass” options. We offer a wide variety of screen, interior grid and color options.

Bay and Bow



Bay windows consist of three windows joined together.  While bow windows consist of four or more windows joined together to form a curve for maximum view from the inside and curb appeal from the outside.  Bow windows are window units made up of 4 to 6 windows in a graceful arc shape.

Awning



Awning windows have a hinge at the top and open out from the bottom. Awning windows are often used on top of larger windows or patio doors for added light and ventilation. Unsurpassed energy efficiency, available with several “Low E Glass” options. We offer a wide variety of screen, interior grid and color options.

Garden



Primarily used in one’s kitchen area, garden windows are ideal for growing herbs, showcasing small flowers and starting plants for late spring planting. Unsurpassed energy efficiency, available with several “Low E glass” options. Preservation’s windows are beautiful, energy efficient windows.