When shopping for windows, its all about being energy efficient.

That is determined by R-values and U-values of the window system.

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. The most energy-efficient windows and doors have higher R-values and lower U-values.

We understand that energy efficiency is more important than ever. That’s why we are continuously looking for ways to ensure that the windows and doors we offer are as thermally efficient as possible. From the materials being used and the glass packages offered, to our commitment of only offering products that are ENERGY STAR® rated, we’re committed to meeting your energy efficiency needs.

Premium Vinyl
The premium vinyl used in our windows and doors is an excellent insulator. Its thermal properties are far superior to aluminum, steel and stainless steel.

Spacer Systems
Most Simonton windows and doors feature unique spacer systems. Made of highly thermally prohibitive materials, these are placed between the glass panes and further reduce temperature transfer through the increase in insulation properties. 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.

Intercept® Spacer System

• Unique U-channel design minimizes conduction for increased efficiency and comfort.
• Durable long-lasting design.
• U-shaped design flexes and contracts, reducing seal failure in the insulating glass unit.

Super Spacer® System

• Solid silicone foam provides superior energy efficiency.
• Does not conduct energy as quickly as metal spacers.
• Silicone foam is flexible and helps reduce stress cracks.

Glass Coatings
Many Simonton windows and doors are available with Low E glass. A transparent metallic oxide coating applied to the glass surface allows short-wave energy to pass through but reflects long-wave infrared energy for greater thermal efficiency.

Gas Fill
The space inside an insulating glass unit—between the glass panes—may be filled with Argon gas, an odorless, non-toxic gas that is six times denser than air. This acts as an added barrier for a higher level of efficiency. Optional Krypton gas may be specified in some glass packages.

Laminated Glass
Some glass packages contain laminated glass. A transparent interlayer is adhered to a pane of glass, acting as a barrier against energy loss, noise transmission and forced entry.