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Replacement Window Rating Explained For Homeowners


Homeowner opening their new window

Knowing What To Look For Will Ensure You Choose
The Best Windows For Your Home

Undergoing a home remodeling project can be an exciting time for most New England homeowners, but in order for it to go smoothly, you need to know that you are making the best choice for your home.

Windows are exceedingly important in the home. Not only do they enhance the curb appeal and resale value of a home, but they can make or break a home’s energy efficiency, cause or prevent rot and infestations, and so much more.

When you are replacing the windows in your home, you want to be sure to choose products from a manufacturer that is proven to provide better energy efficiency in the home, especially if you like saving money. 

Why You Should Care About Your Windows’ Energy Ratings

If you are considering replacement windows, be sure to stick with windows that are certified by ENERGY STAR and the National Fenestration Rating Council (NFRC) to ensure your new windows are guaranteed to be an energy-efficient product.

ENERGY STAR dictates whether a home improvement product is truly energy-efficient, while the NFRC then decides exactly how energy efficient the product is; in this case, replacement windows.

Energy ratings will determine how comfortable your home will be during the various seasons of the year along with how much you will have to pay on annual energy costs. Knowing how to read the NFRC label will help you make the best decision for your home and your wallet. 

Understanding How To Read The NFRC Label

By working together, ENERGY STAR and the NFRC are helping to reduce energy waste in homes all over the country. The NFRC assigns labels to windows, doors, and skylights, all features of a home that provide a great chance to boost your energy efficiency.

Once you have decided which style of window you desire, it’s time to compare the NFRC labels! Depending on which part of the country you live in, certain numbers will be more important than others.

At its core, the NFRC label tells us four things about a window:

  • Its U-Factor Rating
  • Its Solar Heat Gain Coefficient Rating (SHGC)
  • Its Visible Transmittance Rating
  • Its Air Leakage Rating
  • Its Condensation Resistance Rating (in some cases)

U-Factor Rating

The U-Factor rating of a window is based on a scale of 0 to 1, with lower numbers indicating better performance. U-Factor determines how well a window can trap heat, or cool air, inside a room without letting it escape into the outdoors. This is arguably the most important factor as it will directly affect your heating and cooling costs. 

Solar Heat Gain Coefficient Rating (SHGC)

Just like the U-Factor rating, the SHGC rating is expressed on a scale of 0 to 1, and homeowners want the lowest number possible. The SHGC rating is determined by the amount of external heat that can penetrate the replacement window and enter the home. This rating is especially important when considering cooling costs in the summer. 

Visible Transmittance Rating

If you enjoy reaping the benefits of natural sunlight, the Visible Transmittance rating is worth paying attention to! The Visible Transmittance rating measures how effective a window is at allowing natural light to pass into the home. The Visible Transmittance rating is shown on a scale from 0 to 1; in this case, the higher numbers indicate better light transmittance. 

Air Leakage Rating

Drafts and leaky windows are a thing of the past when you choose Jancwicz & Son for your replacement window project. The Air Leakage rating determines the amount of air that is allowed to enter a roof through the window and its’ seals. Again, the Air Leakage rating is measured on a scale of 0 to 1, and homeowners wand replacement windows with a low rating. 

Condensation Resistance Rating

In some cases, certain replacement window manufacturers choose to have certain products tested by the NFRC to determine their Condensation Resistance rating. As you may have guessed, this number determines how well a window can resist condensation build-up, a common cause of rot, mildew, and mold.

If your prospective replacement windows have a Condensation Resistance rating, be sure to choose windows with a low number on a scale of 0 to 1. 

Enhance Your Home’s Energy Efficiency With
High-Quality Replacement Windows Today

Now that you know the importance of a window’s energy ratings and how to read an NFRC label, you are ready to choose your new replacement windows!

When you want the best people with the best results, choose your trusted local home remodeling contracting team here at Jancewicz & son!

If you are ready to jump-start your home remodel or have additional questions about the importance of a window’s energy ratings, reach out to us today.

Call 1-800-281-3585 to speak with our friendly and helpful staff or contact us at your convenience; we are looking forward to your inquiry!


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