Understanding Window Labels


Federal law dictates new and replacement windows mustdisplay specific window labels. There are temporary and permanent markers. Topbrands are certified by the National Fenestration Rating Council (NFRC®). Most modern replacement and new windows for your Madison WI home come with theEnergy Star® label from the U.S. Department of Energy and EnvironmentalProtection Agency.

Energy And Cost Savings

The temporary NFRC label is usually fastened to the inside surface of the glass. It explains the window’s energy performance. Energy-efficiency is rated in terms of U-factor, solar heat gain coefficient, air leakage and visible transmittance. Technically, of this label is missing when your window is installed it’s not considered NFRC certified but temporary labels often come off in shipping and installation.

NFRC is an independent testing agency and its results help when comparing the energy efficiency of windows, doors and skylight. It helps to understand what each rating represents:

  • U-factor – measures how well a replacement window keeps heat from escaping from the inside of a house. Measured in a range from .20 to 1.20 the lower the number the better the window keeps warm air in.
  • Solar Heat Gain Coefficient – measures how a window keeps heat from the outside from warming the inside of a room. It’s most important when thinking about cooling in the summer time. Its simple rating system is ranks window from 0 to 1. Again, the lower the number, the better.
  • Air Leakage – measures how much air can enter a room through the window. Ranked from .01 to .03 it represents the chances of unwanted drafts. The lower the number on the temporary labels, the fewer potential air leaks.
  • Visible Transmittance – measures how well the window allows daylight to enter. A good rating reduces the need for artificial lighting. Ratings range from 0 to 1 and unlike the others, the higher the number the better to allow more light in.

Some labels include a Condensation Rating. It’s optional so not all manufacturers include it on all their windows. If it’s there look for a high number meaning it resists condensation well.

Permanent Label On Replacement Windows

Permanently placed labels are on the side jam at the top of the bottom sill piece or between the spacer on the window. It’s either an adhesive label, a tab added to other information, permanent marks or etchings. The window’s NFRC identification code is on the right side. It doesn’t include any rating information. Some of these labels include a Certified Product Directory code that can be used to look up performance data.

Energy Star Window Labels

The well-known Energy Star label designates products that rank high on energy efficiency ratings. Windows must meet all locally recognized energy code requirements. The Madison area requires outstanding performance in both cold and hot weather because heating and cooling is critical. Installing windows with the Energy Star label can reduce year-around energy costs.

Rely Upon Professional Window Installation

No matter how your new windows are rated, they don’t perform up to their potential with inefficient installation. Select the latest Pella windows for your home and call upon our skilled, experienced and factory-trained installation crews.

Sims represents an elite and limited group of specialists Pella trusts to install its windows and honor all extensive warranty commitments. Proper installation makes a huge difference in performance. Sims Exteriors and Remodeling is a Certified Installation Contractor for all Pella windows in the Madison WI area. For replacement windows featuring energy-efficient ratings on all their window labels contact Sims Exteriors and Remodeling.

About Energy Star

How Energy Star Ratings are calculated


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