NEG U-Values

The u-value of a window is a measurement of the rate of heat loss indicating how well your windows are keeping valuable heat in. It describes how much thermal energy is transmitted through a 1m2 area at a temperature difference of 1 kelvin or(or 1°c). The lower the U-value, the better the thermal performance of the glass.

 

Composite

Air Filled

90% Argon Filled

4 x 6 x 4 Clear Planitherm Total +

2.5

2.1

4 x 8 x 4 Clear Planitherm Total +

2.1

1.7

4 x 10 x 4 Clear Planitherm Total +

1.9

1.5

4 x 12 x 4 Clear Planitherm Total +

1.7

1.3

4 x 14 x 4 Clear Planitherm Total +

1.5

1.2

4 x 16 x 4 Clear Planitherm Total +

1.4

1.2

4 x 18 x 4 Clear Planitherm Total +

1.4

1.2

4 x 20 x 4 Clear Planitherm Total +

1.5

1.2

 

Composite

Air Filled

90% Argon Filled

4 x 6 x 4 Clear Planitherm 4s Four Seasons

2.4

2.0

4 x 8 x 4 Clear Planitherm 4s Four Seasons

2.1

1.6

4 x 10 x 4 Clear Planitherm 4s Four Seasons

1.8

1.4

4 x 12 x 4 Clear Planitherm 4s Four Seasons

1.6

1.2

4 x 14 x 4 Clear Planitherm 4s Four Seasons

1.4

1.1

4 x 16 x 4 Clear Planitherm 4s Four Seasons

1.4

1.0

4 x 18 x 4 Clear Planitherm 4s Four Seasons

1.4

1.1

4 x 20 x 4 Clear Planitherm 4s Four Seasons

1.3

1.1