Thermal Perfomance
Classic Series - Insulated Glass
(Window Thermal Performance of Sun-Tek Skylights - December 1993. Standard Insulated Glazing Units, as calculated using Window 3.1)
MODEL
"U"
"R"
"SC"
"TVIS"
"TSOL"
Ht. Gain
UV% Blockage
C/T (Winter)
.46
2.17
.90
.87
.72
188
59
C/T (Summer)
.50
2.00
B/T (Winter)
.46
2.17
.73
.62
.56
154
80
B/T (Summer)
.52
1.92
C/L (Winter)
.45
2.22
.86
.78
.64
181
100
C/L (Summer)
.53
1.88
B/L (Winter)
.45
2.22
.70
.60
.49
149
100
B/L (Summer)
.54
1.88
H/T (Winter)
.35
2.85
.81
.77
.64
167
63
H/T (Summer)
.36
2.77
H/B (Winter)
.35
2.85
.77
.59
.49
160
83
H/B (Summer)
.38
2.68
H/L (Winter)
.34
2.94
.78
.74
.56
163
100
H/L (Summer)
.39
2.56
HM44 (Winter)
.27
3.70
.30
.38
.18
66
100
C/T (Summer)
.30
3.33
SCBR (Winter)
.45
2.22
.40
.23
.28
88
94
/T (Summer)
.52
1.92
 
AZUR (Winter)
.46
2.17
.53
.70
.37
114
52
CLR (Summer)
.53
1.88
 
AZUR (Winter)
.35
2.85
.37
.60
.18
100
100
AZUR (Summer)
.57
1.75
 
AZUR (Winter)
.26
3.80
.48
.66
.43
103
100
LOW-E (Summer)
.26
3.80
U and R values change with the angle of inclination; the model of skylight, and the size of the skylight, etc.