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

2.0

4 x 8 x 4 Clear Planitherm Total

2.1

1.7

4 x 10 x 4 Clear Planitherm Total

1.8

1.5

4 x 12 x 4 Clear Planitherm Total

1.6

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

1.4

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

  

Planitherm Total

Composite

 Air Filled Gas Filled          
4x6x4 Clear Planitherm Total                                   

2.5                               

2.0

4x8x4 Clear Planitherm Total           

2.1 1.7

4x10x4 Clear Planitherm Total           

1.8 1.5

4x12x4 Clear Planitherm Total           

1.6 1.3

4x14x4 Clear Planitherm Total           

1.5 1.2

4x16x4 Clear Planitherm Total           

1.4 1.2

4x18x4 Clear Planitherm Total           

1.4 1.2

4x20x4 Clear Planitherm Total           

1.4 1.2
4 x 6 x 4 Planitherm 4S Four Seasons