Thermal King Glass
Education - Low E Glass

Low Performance
½" Airspace
(No coating)

Mid Performance
Low E
(Hardcoat)

High Performance
Low E Squared
(Softcoat x 2)

High Performance
Low E Cubed
(Softcoat x 3)

R-Value
"Insulation factor"
(Higher is better)

2

3

4

4.2

Visible Light

82 %

76 %

73 %

62 %

Ultra Violet Light
"Damages furniture"
(Lower is better)

76 %

57 %

23 %

4 %

Infra-Red Light
"Causes heat"
(Lower is better)

63 %

59 %

15 %

0 %