Performance Data Questions

​Q. What are R-values and U-values? 

A. R-value is the resistance a material has to heat flow. The higher the R-value, the greater the resistance. U-value is the amount of heat transferred through a material. The lower the U-value, the slower the rate of heat flow and the better the insulating quality. When shopping for windows or doors, look for higher R-values and lower U-values for the most energy-efficient products possible.

Q. What is Low E/Argon-filled glass, and how does it work? 

A. Low E (Emissivity) glass has a special coating applied onto or into the glass surface. The coating allows short-wave energy to pass through but reflects long-wave infrared energy, improving the U-Value.

Argon Gas is an odorless, colorless, tasteless, non-toxic gas that is six times denser than air. It’s used to replace air between the glass panes to reduce temperature transfer for better thermal efficiency.

Q. How do Simonton products perform when compared to AAMA and NFRC standards? 

A. Simonton Windows products test data compares very favorably with the American Architectural Manufacturers Association (AAMA) and the National Fenestration Rating Council (NFRC) standards. Our commitment is to provide the best possible thermal, air, water, operating force and structural performance in each of our product lines.

Q. What does it mean that Simonton’s windows and doors pass AAMA and NFRC tests?

A. All Simonton products are certified to meet or exceed industry standards set forth by the American Architectural Manufacturers Association (AAMA), and the National Fenestration Rating Council (NFRC). Select the link of your choice to learn more about each organization's standards and testing procedures, and why choosing products that meet these standards is important to homeowners.

Q. How does insulating glass improve the quality of Simonton's windows and doors?

A. Insulating glass improves the quality of Simonton windows and doors by:

  • Improving the performance of the U- and R-values of your new windows and doors.
  • Reducing condensation.
  • Helping keep the heat in and cold out during winter.
  • Helping keep the heat out and the cold in during summer.


Q. How do vinyl windows compare with windows made from other materials, such as wood and aluminum? 

A. The performance and longevity of vinyl windows compare very favorably to those of other building materials, and vinyl often costs less to produce. Vinyl windows and doors are rapidly capturing a major market share as more builders and homeowners learn about vinyl's outstanding value and economy.

Long-lasting beauty, low maintenance and excellent thermal efficiency ratings give vinyl windows a winning edge over other types of replacement windows. Simonton's vinyl compound is produced with extra levels of UV inhibitors to help withstand harsh weather conditions, and it is recyclable and environmentally friendly. Vinyl won't pit or peel over time with only simple care and cleaning, windows can keep their beautiful appearance for years to come.