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	Canada Rebates / Incentives Learn about rebates and incentives offered in Canada. Click here to see if you qualify.


	US Rebates / Incentives Learn about rebates and incentives offered in the US. Click here to see if you qualify.

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 Energy Star
U-Value
Canada Energy Star
U-Factor
United States SHGC VT ER Canadian
Zones US
Zones

Classic
Casement
3-1/4" WC100 Clear IG Air 2.1 2.6 2.2 0.39 0.48 0.51

Low-E Argon 3.4 3.5 1.6 0.28 0.45 0.47 31 A-B-C-D All Zones

Low-E2 Argon 4.0 3.8 1.47 0.26 0.26 0.45 22 A-B-C All Zones

Low-E Argon Grid 3.4 3.5 1.6 0.28 0.41 0.42 29 A-B-C-D All Zones

Low-E2 Argon Grid 4.0 3.8 1.47 0.26 0.24 0.40 21 A-B-C All Zones

Classic
Awning
3-1/4" WC125 Clear IG Air 2.1 2.5 2.27 0.40 0.48 0.51

Low-E Argon 3.4 3.6 1.59 0.28 0.45 0.47 31 A-B-C-D All Zones

Low-E2 Argon 4.0 3.8 1.47 0.26 0.26 0.45 23 A-B-C All Zones

Low-E Argon Grid 3.4 3.6 1.6 0.28 0.41 0.42 29 A-B-C-D All Zones

Low-E2 Argon Grid 4.0 3.8 1.47 0.26 0.24 0.40 21 A-B-C All Zones

Classic
Fixed
Casement
3-1/4" WC175 Clear IG Air 2.1 2.5 2.38 0.40 0.48 0.51

Low-E Argon 3.4 3.6 1.64 0.28 0.45 0.47 31 A-B-C-D All Zones

Low-E2 Argon 4.0 3.8 1.47 0.26 0.26 0.45 23 A-B-C All Zones

Low-E Argon Grid 3.4 3.6 1.64 0.28 0.41 0.42 29 A-B-C-D All Zones

Low-E2 Argon Grid 4.0 3.8 1.47 0.26 0.24 0.40 21 A-B-C All Zones

Classic
Single
Slider
3-1/4" WC200 Clear IG Air 2.1 2.2 2.55 0.45 0.59 0.63

Low-E Argon 3.1 3.2 1.76 0.31 0.56 0.58 33 A-B-C-D All Zones

Low-E2 Argon 4.0 3.6 1.56 0.28 0.32 0.55 23 A-B-C All Zones

Low-E Argon Grid 3.4 3.2 1.76 0.31 0.50 0.52 29 A-B-C-D All Zones

Low-E2 Argon Grid 4.0 3.6 1.59 0.28 0.29 0.49 21 A-B-C All Zones

Classic
Single
Hung
3-1/4" WC201 Clear IG Air 2.1 2.2 2.55 0.45 0.59 0.63

Low-E Argon 3.4 3.2 1.76 0.31 0.56 0.58 33 A-B-C-D All Zones

Low-E2 Argon 4.0 3.6 1.59 0.28 0.32 0.55 23 A-B-C All Zones

Low-E Argon Grid 3.4 3.2 1.76 0.31 0.50 0.52 29 A-B-C-D All Zones

Low-E2 Argon Grid 4.0 3.6 1.59 0.28 0.29 0.49 21 A-B-C All Zones

Classic
Double
Slider
3-1/4" WC250 Clear IG Air 2.1 2.3 2.49 0.44 0.55 0.58

Low-E Argon 3.4 3.2 1.76 0.31 0.51 0.53 28 A-B-C All Zones

Low-E2 Argon 4.0 3.6 1.59 0.28 0.30 0.51 20 A-B-C All Zones

Low-E Argon Grid 3.4 3.2 1.76 0.31 0.46 0.47 25 A-B-C All Zones

Low-E2 Argon Grid 4.0 3.6 1.59 0.28 0.27 0.45 18 A-B-C All Zones

Classic
Double
Hung
3-1/4" WC251 Clear IG Air 2.1 2.3 2.5 0.44 0.57 0.60

Low-E Argon 3.4 3.2 1.76 0.31 0.53 0.55 30 A-B-C-D All Zones

Low-E2 Argon 4.0 3.6 1.59 0.28 0.31 0.53 21 A-B-C All Zones

Low-E Argon Grid 3.4 3.2 1.76 0.31 0.47 0.49 26 A-B-C All Zones

Low-E2 Argon Grid 4.0 3.6 1.59 0.28 0.28 0.47 19 A-B-C All Zones

Classic
Single
Slider
3-1/4" WC325 Clear IG Air 2.1 2.2 2.6 0.46 0.62 0.66

Low-E Argon 3.4 3.2 1.76 0.31 0.58 0.60 Pending All Zones

Low-E2 Argon 4.0 3.6 1.59 0.28 0.34 0.58 Pending All Zones

Low-E Argon Grid 3.4 3.2 1.76 0.31 0.52 0.54 Pending All Zones

Low-E2 Argon Grid 4.0 3.6 1.59 0.28 0.30 0.52 Pending All Zones

Classic
Casement
4-1/2" WC400 Clear IG Air 2.1 2.6 2.2 0.39 0.47 0.49

Low-E Argon 3.4 3.6 1.59 0.28 0.44 0.45 30 A-B-C-D All Zones

Low-E2 Argon 4.0 4.0 1.42 0.25 0.25 0.43 23 A-B-C-D All Zones

Classic
Awning
4-1/2" WC425 Clear IG Air 2.1 2.6 2.21 0.39 0.46 0.49

Low-E Argon 3.4 3.5 1.59 0.28 0.44 0.45 29 A-B-C-D All Zones

Low-E2 Argon 4.0 4.0 1.42 0.25 0.25 0.43 22 A-B-C-D All Zones

Classic
Fixed LP
4-1/2" WC450 Clear IG Air 2.1 2.4 2.38 0.42 0.54 0.58

Low-E Argon 3.4 3.6 1.59 0.28 0.51 0.53 35 A-B-C All Zones

Low-E2 Argon 4.0 4.0 1.42 0.25 0.30 0.51 26 A-B-C-D All Zones

Classic
Fixed
Casement
4-1/2" WC475 Clear IG Air 2.1 2.4 2.38 0.42 0.56 0.60

Low-E Argon 3.5 3.5 1.64 0.29 0.53 0.55 36 A-B-C-D All Zones

Low-E2 Argon 4.0 3.8 1.47 0.26 0.31 0.53 38 A-B-C-D All Zones

Heritage
Casement
3-1/4" HC101 Clear IG Air 2.1 2.5 2.27 0.40 0.49 0.52

Low-E Argon 3.5 3.5 1.64 0.29 0.46 0.47 30 A-B-C-D All Zones

Low-E2 Argon 3.9 3.8 1.47 0.26 0.27 0.45 23 A-B-C All Zones

Low-E Argon Grid 3.5 3.5 1.64 0.29 0.42 0.43 28 A-B-C All Zones

Low-E2 Argon Grid 3.9 3.8 1.47 0.26 0.24 0.41 21 A-B-C All Zones

Heritage
Awning
3-1/4" HC126 Clear IG Air 2.1 2.5 2.27 0.40 0.49 0.52

Low-E Argon 3.5 3.5 1.64 0.29 0.46 0.47 39 A-B-C-D All Zones

Low-E2 Argon 3.9 3.8 1.47 0.26 0.27 0.45 27 A-B-C All Zones

Low-E Argon Grid 3.5 3.5 1.64 0.29 0.42 0.43 36 A-B-C All Zones

Low-E2 Argon Grid 3.9 3.8 1.47 0.26 0.24 0.41 25 A-B-C All Zones

Heritage
Fixed LP
3-1/4" HC151 Clear IG Air 2.1 2.2 2.55 0.45 0.67 0.71

Low-E Argon 3.3 3.3 1.7 0.30 0.63 0.65 39 A-B-C-D All Zones

Low-E2 Argon 3.9 3.7 1.53 0.27 0.36 0.63 27 A-B-C All Zones

Low-E Argon Grid 3.3 3.3 1.7 0.30 0.57 0.59 36 A-B-C All Zones

Low-E2 Argon Grid 3.9 3.7 1.53 0.27 0.33 0.56 25 A-B-C All Zones

Heritage
Fixed
Casement
3-1/4" HC176 Clear IG Air 2.1 2.3 2.44 0.43 0.58 0.62

Low-E Argon 3.3 3.5 1.64 0.29 0.55 0.57 36 A-B-C-D All Zones

Low-E2 Argon 3.9 3.8 1.47 0.26 0.32 0.54 26 A-B-C All Zones

Low-E Argon Grid 3.3 3.5 1.64 0.29 0.49 0.51 32 A-B-C All Zones

Low-E2 Argon Grid 3.9 3.8 1.47 0.26 0.29 0.48 24 A-B-C All Zones

Heritage
Double
Slider
LO
3-1/4" HC350 Clear IG Air 2.1 2.2 2.55 0.45 0.56 0.59

Low-E Argon 3.4 3.2 1.76 0.31 0.52 0.54 Pending All Zones

Low-E2 Argon 4.0 3.6 1.59 0.28 0.30 0.52 Pending All Zones

Low-E Argon Grid 3.4 3.2 1.76 0.31 0.47 0.48 Pending All Zones

Low-E2 Argon Grid 4.0 3.6 1.59 0.28 0.27 0.46 Pending All Zones

Ultra
Single
Patio
Door
5-1/2" WC500 Clear IG Air 2.1 2.3 2.43 0.43 0.58 0.61 Pending

Low-E Argon 3.4 3.3 1.6 0.30 0.54 0.56 Pending All Zones

Low-E2 Argon 4.0 3.7 1.52 0.27 0.31 0.53 Pending All Zones

Low-E Argon Grid 3.4 3.3 1.6 0.30 0.48 0.49 Pending All Zones

Low-E2 Argon Grid 4.0 3.7 1.52 0.27 0.27 0.47 Pending All Zones

Triple-Pane and Laminated Glass Performance

Product Series Glazing Fill Grid 0.75 C.O.G
R-Value R-Value Energy Star
U-Value
Canada Energy Star
U-Factor
United States SHGC VT ER Canadian
Zones US
Zones

Classic
Casement
3-1/4" WC100 Low-E2 Argon 5.9 4.8 1.2 0.21 0.22 0.35 26 A-B-C-D All Zones

Triple Low-E2 Argon Grid 5.9 4.8 1.2 0.21 0.20 0.32 25 A-B-C-D All Zones

Pane Low-E2 Krypton 8.7 5.6 1.0 0.18 0.22 0.35 30 A-B-C-D All Zones

WC100 Low-E2 Argon 3.9 3.8 1.5 0.26 0.29 0.44 24 A-B-C All Zones

Laminated Low-E2 Argon Grid 3.9 3.8 1.5 0.26 0.27 0.39 23 A-B-C All Zones

Tri Pane Low-E2 Krypton 4.2 4.0 1.4 0.25 0.29 0.44 26 A-B-C-D All Zones

Classic
Fixed
Casement
3-1/4" WC175 Low-E2 Argon 5.9 5.3 1.1 0.19 0.31 0.50 33 A-B-C-D All Zones

Triple Low-E2 Argon Grid 5.9 5.0 1.1 0.20 0.28 0.45 30 A-B-C-D All Zones

Pane Low-E2 Krypton 8.9 6.3 0.9 0.16 0.27 0.43 35 A-B-C-D All Zones

WC175 Low-E2 Argon 3.9 3.8 1.5 0.26 0.41 0.62 31 A-B-C-D All Zones

Laminated Low-E2 Argon Grid 3.9 3.8 1.5 0.26 0.37 0.55 29 A-B-C-D All Zones

Tri Pane Low-E2 Krypton 4.2 4.0 1.4 0.25 0.35 0.53 29 A-B-C-D All Zones

Heritage
Casement
3-1/4" HC101 Low-E2 Argon 5.9 4.8 1.18 0.21 0.23 0.36 27 A-B-C-D All Zones

Triple Low-E2 Argon Grid 5.9 4.5 1.2 0.22 0.21 0.33 24 A-B-C-D All Zones

Pane Low-E2 Krypton 8.9 5.6 1.02 0.18 0.23 0.36 34 A-B-C-D All Zones

HC101 Low-E2 Argon 3.9 3.8 1.47 0.26 0.30 0.45 24 A-B-C All Zones

Laminated Low-E2 Argon Grid 3.9 3.8 1.5 0.26 0.27 0.40 23 A-B-C All Zones

Tri Pane Low-E2 Krypton 4.2 4.0 1.4 0.25 0.30 0.45 26 A-B-C-D All Zones

Heritage
Fixed LP
3-1/4" HC151 Low-E2 Argon 5.9 5.3 1.07 0.19 0.31 0.50 34 A-B-C-D All Zones

Triple Low-E2 Argon Grid 5.9 5.0 1.1 0.20 0.28 0.45 31 A-B-C-D All Zones

Pane Low-E2 Krypton 8.7 6.7 0.85 0.15 0.31 0.50 39 A-B-C-D All Zones

HC151 Low-E2 Argon 3.9 3.7 1.53 0.27 0.41 0.62 30 A-B-C All Zones

Laminated Low-E2 Argon Grid 3.9 3.7 1.5 0.27 0.37 0.55 28 A-B-C All Zones

Tri Pane Low-E2 Krypton 4.2 4.0 1.4 0.25 0.41 0.62 33 A-B-C-D All Zones

Heritage
Fixed
Casement
3-1/4" HC176 Low-E2 Argon 5.9 5.0 1.1 0.20 0.27 0.43 26 A-B-C All Zones

Triple Low-E2 Argon Grid 5.9 4.8 1.19 0.21 0.24 0.39 24 A-B-C All Zones

Pane Low-E2 Krypton 8.7 6.3 0.9 0.16 0.27 0.43 31 A-B-C-D All Zones

HC176 Low-E2 Argon 3.9 3.8 1.47 0.26 0.36 0.54 28 A-B-C All Zones

Laminated Low-E2 Argon Grid 3.9 3.8 1.47 0.26 0.32 0.48 26 A-B-C All Zones

Tri Pane Low-E2 Krypton 4.2 4.0 1.4 0.25 0.36 0.54 30 A-B-C-D All Zones

Ultra
Single
Patio
Door
5-1/2" WC500 Low-E2 Krypton 8.9 5.9 0.96 0.17 0.27 0.43 All Zones

Triple

Pane

WC500 Low-E2 Krypton 4.1 3.8 1.47 0.26 0.31 0.53 All Zones

Laminated

Tri Pane