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The Energy Star program was developed by the U.S Department of Energy and the U.S Environmental Protection Agency to help identify energy-efficient choices for your home. The Energy Star seal is only granted to products that demonstrate significant reduction in energy consumption in the home. All Window City windows and doors listed meet or exceed U.S and Canadian regulations to be considered Energy Star compliant.

Double-Pane Glass Performance
Product Series Glazing Fill Grid 0.75 C.O.G
R-Value		 R-Value U-Factor SHGC VT ER Zones
Classic
Casement
3-1/4"		 WC100 Clear IG Air   2.1 2.6 0.39 0.48 0.51    
Low-E Argon   3.4 3.5 0.28 0.45 0.47 31 A-B-C-D
Low-E2 Argon   4.0 3.8 0.26 0.26 0.45 22 A-B-C
Low-E Argon Grid 3.4 3.5 0.28 0.41 0.42 29 A-B-C-D
Low-E2 Argon Grid 4.0 3.8 0.26 0.24 0.40 21 A-B-C
Classic
Awning
3-1/4"		 WC125 Clear IG Air   2.1 2.5 0.40 0.48 0.51    
Low-E Argon   3.4 3.6 0.28 0.45 0.47 31 A-B-C-D
Low-E2 Argon   4.0 3.8 0.26 0.26 0.45 23 A-B-C
Low-E Argon Grid 3.4 3.6 0.28 0.41 0.42 29 A-B-C-D
Low-E2 Argon Grid 4.0 3.8 0.26 0.24 0.40 21 A-B-C
Classic
Fixed
Casement
3-1/4"		 WC175 Clear IG Air   2.1 2.5 0.40 0.48 0.51    
Low-E Argon   3.4 3.6 0.28 0.45 0.47 31 A-B-C-D
Low-E2 Argon   4.0 3.8 0.26 0.26 0.45 23 A-B-C
Low-E Argon Grid 3.4 3.6 0.28 0.41 0.42 29 A-B-C-D
Low-E2 Argon Grid 4.0 3.8 0.26 0.24 0.40 21 A-B-C
Classic
Single
Slider
3-1/4"		 WC200 Clear IG Air   2.1 2.2 0.45 0.59 0.63    
Low-E Argon   3.1 3.2 0.31 0.56 0.58 Awaiting final reports  
Low-E2 Argon   4.0 3.6 0.28 0.32 0.55 Awaiting final reports  
Low-E Argon Grid 3.4 3.2 0.31 0.50 0.52 Awaiting final reports  
Low-E2 Argon Grid 4.0 3.6 0.28 0.29 0.49 Awaiting final reports  
Classic
Single
Hung
3-1/4"		 WC201 Clear IG Air   2.1 2.2 0.45 0.59 0.63    
Low-E Argon   3.4 3.2 0.31 0.56 0.58 Awaiting final reports  
Low-E2 Argon   4.0 3.6 0.28 0.32 0.55 Awaiting final reports  
Low-E Argon Grid 3.4 3.2 0.31 0.50 0.52 Awaiting final reports  
Low-E2 Argon Grid 4.0 3.6 0.28 0.29 0.49 Awaiting final reports  
Classic
Double
Slider
3-1/4"		 WC250 Clear IG Air   2.1 2.3 0.44 0.55 0.58    
Low-E Argon   3.4 3.2 0.31 0.51 0.53 28 A-B-C
Low-E2 Argon   4.0 3.6 0.28 0.30 0.51 20 A-B-C
Low-E Argon Grid 3.4 3.2 0.31 0.46 0.47 25 A-B-C
Low-E2 Argon Grid 4.0 3.6 0.28 0.27 0.45 18 A-B-C
Classic
Double
Hung
3-1/4"		 WC251 Clear IG Air   2.1 2.3 0.44 0.57 0.60    
Low-E Argon   3.4 3.2 0.31 0.53 0.55 30 A-B-C-D
Low-E2 Argon   4.0 3.6 0.28 0.31 0.53 21 A-B-C
Low-E Argon Grid 3.4 3.2 0.31 0.47 0.49 26 A-B-C
Low-E2 Argon Grid 4.0 3.6 0.28 0.28 0.47 19 A-B-C
Classic
Single
Slider
3-1/4"		 WC325 Clear IG Air   2.1 2.2 0.46 0.62 0.66    
Low-E Argon   3.4 3.2 0.31 0.58 0.60 Awaiting final reports  
Low-E2 Argon   4.0 3.6 0.28 0.34 0.58 Awaiting final reports  
Low-E Argon Grid 3.4 3.2 0.31 0.52 0.54 Awaiting final reports  
Low-E2 Argon Grid 4.0 3.6 0.28 0.30 0.52 Awaiting final reports  
Classic
Casement
4-1/2"		 WC400 Clear IG Air   2.1 2.6 0.39 0.47 0.49    
Low-E Argon   3.4 3.6 0.28 0.44 0.45 30 A-B-C-D
Low-E2 Argon   4.0 4.0 0.25 0.25 0.43 23 A-B-C-D
Classic
Awning
4-1/2"		 WC425 Clear IG Air   2.1 2.6 0.39 0.46 0.49    
Low-E Argon   3.4 3.5 0.28 0.44 0.45 29 A-B-C-D
Low-E2 Argon   4.0 4.0 0.25 0.25 0.43 22 A-B-C-D
Classic
Fixed LP
4-1/2"		 WC450 Clear IG Air   2.1 2.4 0.42 0.54 0.58    
Low-E Argon   3.4 3.6 0.28 0.51 0.53 35 A-B-C
Low-E2 Argon   4.0 4.0 0.25 0.30 0.51 26 A-B-C-D
Classic
Fixed
Casement
4-1/2"		 WC475 Clear IG Air   2.1 2.4 0.42 0.56 0.60    
Low-E Argon   3.5 3.5 0.29 0.53 0.55 36 A-B-C-D
Low-E2 Argon   4.0 3.8 0.26 0.31 0.53 38 A-B-C-D
Heritage
Casement
3-1/4"		 HC101 Clear IG Air   2.1 2.5 0.40 0.49 0.52    
Low-E Argon   3.5 3.5 0.29 0.46 0.47 30 A-B-C-D
Low-E2 Argon   3.9 3.8 0.26 0.27 0.45 23 A-B-C
Low-E Argon Grid 3.5 3.5 0.29 0.42 0.43 28 A-B-C
Low-E2 Argon Grid 3.9 3.8 0.26 0.24 0.41 21 A-B-C
Heritage
Awning
3-1/4"		 HC126 Clear IG Air   2.1 2.5 0.40 0.49 0.52    
Low-E Argon   3.5 3.5 0.29 0.46 0.47 39 A-B-C-D
Low-E2 Argon   3.9 3.8 0.26 0.27 0.45 27 A-B-C
Low-E Argon Grid 3.5 3.5 0.29 0.42 0.43 36 A-B-C
Low-E2 Argon Grid 3.9 3.8 0.26 0.24 0.41 25 A-B-C
Heritage
Fixed LP
3-1/4"		 HC151 Clear IG Air   2.1 2.2 0.45 0.67 0.71    
Low-E Argon   3.3 3.3 0.30 0.63 0.65 39 A-B-C-D
Low-E2 Argon   3.9 3.7 0.27 0.36 0.63 27 A-B-C
Low-E Argon Grid 3.3 3.3 0.30 0.57 0.59 36 A-B-C
Low-E2 Argon Grid 3.9 3.7 0.27 0.33 0.56 25 A-B-C
Heritage
Fixed
Casement
3-1/4"		 HC176 Clear IG Air   2.1 2.3 0.43 0.58 0.62    
Low-E Argon   3.3 3.5 0.29 0.55 0.57 36 A-B-C-D
Low-E2 Argon   3.9 3.8 0.26 0.32 0.54 26 A-B-C
Low-E Argon Grid 3.3 3.5 0.29 0.49 0.51 32 A-B-C
Low-E2 Argon Grid 3.9 3.8 0.26 0.29 0.48 24 A-B-C
Heritage
Double
Slider
LO
3-1/4"		 HC350 Clear IG Air   2.1 2.2 0.45 0.56 0.59    
Low-E Argon   3.4 3.2 0.31 0.52 0.54 Awaiting final reports  
Low-E2 Argon   4.0 3.6 0.28 0.30 0.52 Awaiting final reports  
Low-E Argon Grid 3.4 3.2 0.31 0.47 0.48 Awaiting final reports  
Low-E2 Argon Grid 4.0 3.6 0.28 0.27 0.46 Awaiting final reports  
Classic
Single
Patio
Door
5-1/2"		 HC500 Clear IG Air   2.1 2.3 0.43 0.58 0.61 Awaiting final reports  
Low-E Argon   3.4 3.3 0.30 0.54 0.56 Awaiting final reports  
Low-E2 Argon   4.0 3.7 0.27 0.31 0.53 Awaiting final reports  
Low-E Argon Grid 3.4 3.3 0.30 0.48 0.49 Awaiting final reports  
Low-E2 Argon Grid 4.0 3.7 0.27 0.27 0.47 Awaiting final reports  


Triple-Pane and Laminated Glass Performance
Product Series Glazing Fill Grid 0.75 C.O.G
R-Value		 R-Value U-Factor SHGC VT ER Zones
Classic
Casement
3-1/4"		 WC100 Low-E2 Argon   5.9 4.8 0.21 0.22 0.35 26 A-B-C-D
Triple Low-E2 Argon Grid 5.9 4.8 0.21 0.20 0.32 25 A-B-C-D
Pane Low-E2 Krypton   8.7 5.6 0.18 0.22 0.35 30 A-B-C-D
WC100 Low-E2 Argon   3.9 3.8 0.26 0.29 0.44 24 A-B-C
Laminated Low-E2 Argon Grid 3.9 3.8 0.26 0.27 0.39 23 A-B-C
Tri Pane Low-E2 Krypton   4.2 4.0 0.25 0.29 0.44 26 A-B-C-D
Classic
Fixed
Casement
3-1/4"		 WC175 Low-E2 Argon   5.9 5.3 0.19 0.31 0.50 33 A-B-C-D
Triple Low-E2 Argon Grid 5.9 5.0 0.20 0.28 0.45 30 A-B-C-D
Pane Low-E2 Krypton   8.9 6.3 0.16 0.27 0.43 35 A-B-C-D
WC175 Low-E2 Argon   3.9 3.8 0.26 0.41 0.62 31 A-B-C-D
Laminated Low-E2 Argon Grid 3.9 3.8 0.26 0.37 0.55 29 A-B-C-D
Tri Pane Low-E2 Krypton   4.2 4.0 0.25 0.35 0.53 29 A-B-C-D
Heritage
Casement
3-1/4"		 HC101 Low-E2 Argon   5.9 4.8 0.21 0.23 0.36 27 A-B-C-D
Triple Low-E2 Argon Grid 5.9 4.5 0.22 0.21 0.33 24 A-B-C-D
Pane Low-E2 Krypton   8.9 5.6 0.18 0.23 0.36 34 A-B-C-D
HC101 Low-E2 Argon   3.9 3.8 0.26 0.30 0.45 24 A-B-C
Laminated Low-E2 Argon Grid 3.9 3.8 0.26 0.27 0.40 23 A-B-C
Tri Pane Low-E2 Krypton   4.2 4.0 0.25 0.30 0.45 26 A-B-C-D
Heritage
Fixed LP
3-1/4"		 HC151 Low-E2 Argon   5.9 5.3 0.19 0.31 0.50 34 A-B-C-D
Triple Low-E2 Argon Grid 5.9 5.0 0.20 0.28 0.45 31 A-B-C-D
Pane Low-E2 Krypton   8.7 6.7 0.15 0.31 0.50 39 A-B-C-D
HC151 Low-E2 Argon   3.9 3.7 0.27 0.41 0.62 30 A-B-C
Laminated Low-E2 Argon Grid 3.9 3.7 0.27 0.37 0.55 28 A-B-C
Tri Pane Low-E2 Krypton   4.2 4.0 0.25 0.41 0.62 33 A-B-C-D
Heritage
Fixed
Casement
3-1/4"		 HC176 Low-E2 Argon   5.9 5.0 0.20 0.27 0.43 26 A-B-C
Triple Low-E2 Argon Grid 5.9 4.8 0.21 0.24 0.39 24 A-B-C
Pane Low-E2 Krypton   8.7 6.3 0.16 0.27 0.43 31 A-B-C-D
HC176 Low-E2 Argon   3.9 3.8 0.26 0.36 0.54 28 A-B-C
Laminated Low-E2 Argon Grid 3.9 3.8 0.26 0.32 0.48 26 A-B-C
Tri Pane Low-E2 Krypton   4.2 4.0 0.25 0.36 0.54 30 A-B-C-D