U-value is the amount of heat transferrence through a material. The lower the U-Value the better the insulating quality.R-Value is the resistance a material has to heat flow. The higher the R-Value, the greater the resistance to heat loss.
All NorthEast windows manufactured with Low E Glass & Argon Gas are Energy Star Certified. All will come with an Energy Star Label.
The chart below reflects the U & R values for all NorthEast Energy Star Certified Windows.
| Window | U Value | R Value |
| Double Hung 100 | .32 | 3.125 |
| Double Hung 900/990 | .32 | 3.125 |
| Slider SL 110/120 | .32 | 3.125 |
| Slider SL 710/720 | .31 | 3.225 |
| Picture Window - PW130 | .31 | 3.225 |
| Casement - CW300 | .31 | 3.225 |
| Awning - AW300 | .31 | 3.225 |
| Basement Hoppers BH100 | .32 | 3.125 |
