How to Find Your Window’s Energy Performance

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Tue, Aug 30, 2016

​Looking for the perfect window to withstand the freezing temps of Grand Forks, North Dakota? Need a solution for the scorching hot summers in Phoenix, Arizona? Each home requires a different level of energy performance — whether it’s based on regional requirements or homeowner’s preference.

Not all windows and doors are the same — especially when it comes to energy efficiency. To help improve comfort and save money on energy bills, each product offers different features to address heat and light transfer. Check out Windsor’s Energy Performance Search Tool to find the ideal ratings for your region and desired level of energy efficiency.

How it Works

1. Pick a product line.

Choose the material type you’re looking for, from wood (Pinnacle), vinyl (Next Dimension) and cellular PVC (Legend) products.

2. Pick a product type.

What kind of window or door are you looking for? You can choose from awnings, casements, double hung, bifold doors and more.

Pick your window style

3. Choose your glass type and tint.

Windsor products feature several Low-E (low emissivity) glass options. Tint will help control glare and moderate temperatures in rooms that receive direct sun.

Choose your glass type and tint

4. Choose your fill and grille type.

Choose between Air or Argon for your Insulating Glass Units (IGU). Then select between available Grille options, based on your preferred style. 

Choose your window fill and grille types

5. Select your Energy Star Climate Zone.

Energy Star Climate Zones have been established by the NFRC and EPA to help homeowners set expectations for the performance levels of their windows and doors. Select your Climate Zone to target products that meet or exceed the energy efficiency standards based on your geography. Click here to find your Climate Zone.

Select Your Energy Start Climate Zone

6. Click the ‘Search’ button.

You will get a full listing of Windsor products that meet your criteria, along with their different energy ratings. You can also download the results, which you can print out and bring to your local Windsor distributor.

Search Results
 

Evaluating the Energy Ratings

Now that you have a list of matching windows and doors, you can begin narrowing down your selections. Here’s how to read the different energy ratings of each product.

U-Factor (or U-value): 

U-factor indicates the rate of heat loss of a window or door. The lower the U-factor, the greater a window's resistance to heat flow and the better its insulating properties.

  • Tip: If you’re looking for windows or doors on a north-facing wall, you will want a lower U-factor.

SHGC (solar heat gain coefficient):

SHGC measures the amount of solar heat that reaches your window and the amount transferred inside. SHGC will be a number between 0 and 1.

  • Tip: In a hot climate, or in a cold climate on west-facing windows with rooms that tend to overheat in low-angle afternoon sun, less solar heat gain is generally good, and this number should be low.
  • Tip: In cold climates on south-facing walls, a higher SHGC (0.42 to 0.63) is better because it allows "passive solar" heating. In hot climates, look for values as low as 0.25.

VT (visible transmittance): 

Like SHGC, VT measures the amount of light that strikes a window and the amount that makes it through. VT is expressed as a value from 0 to 1, which indicates the amount of visible light that makes it through, also taking into consideration the light blocked by the frame, grille and muntins.

  • Tip: VT values less than 0.40 will start to produce lower, shaded levels of light based on the tint color.

New Features

Windsor has also recently made several updates that are now available in the latest version of the Energy Performance Search Tool. We are always working hard to bring the most accurate information to help builders, architects and homeowners evaluate products for their homes. In order to keep you current with the latest regulations and product innovations, Windsor's Energy Performance Search Tool has been updated to reflect the following: 

  • New Energy Star guidelines for each U.S. and Canada zones, according to Energy Star 6.0 requirements
  • The Solar Heat Gain (SHGC) tradeoffs have been included for Northern U.S. zone
  • NFRC numbers have been updated per the latest simulations
  • New Windsor products have been added, including multi-slide and non-BM Classic
  • New Revive replacement window product series is now listed separately
  • New glass options have been added, including Dual LoE HS, 180 and Triple Insulated Glass (IG) 

Start Your Search

Windsor is dedicated to providing you the tools you need to evaluate your options, whether you’re looking for windows and doors for new construction or scouting replacement windows for a home improvement project.

Ready to get started? Click here to begin the search for windows and doors for your next project!