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Table 14 Comparison of typical window thermal efficiencies Thermal performance of a typical casement window with low conductivity edge seal Aluminum frame with thermal break
Wood or vinyl frame
Fibreglass frame
RSI
R
U
ER
RSI
R
U
ER
RSI
R
U
ER
Double glazed clear with air fill
0.28
1.59
0.62
0.6
0.36
2.04
0.49
15.1
0.42
2.38
0.42
21.0
Double glazed low-E with air fill
0.35
1.99
0.50
7.3
0.47
2.67
0.37
22.9
0.55
3.12
0.32
28.5
Double glazed low-E with argon
0.37
2.10
0.48
11.0
0.51
2.90
0.34
26.7
0.61
3.46
0.29
32.0
Triple glazed clear with air fill
0.35
1.99
0.50
7.3
0.50
2.84
0.35
28.2
0.56
3.18
0.31
29.2
Triple glazed low-E with air fill
0.39
2.21
0.45
12.1
0.60
3.41
0.29
30.5
0.68
3.86
0.26
33.8
Triple glazed low-E with argon
0.41
2.33
0.43
14.8
0.65
3.69
0.27
33.2
0.75
4.25
0.24
34.6