Article | REF: N4408 V1

Insulating glazing: light and energy

Author: Michel CHAUNAC

Publication date: February 10, 2014, Review date: April 26, 2023

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8. Energy control

Under current regulations, glazing with a high solar factor g and a low U g coefficient will be preferred (RT 2005 and RT 2012 thermal regulations).

In winter, and especially in summer when the sun is shining brightly, this sometimes results in a significant rise in indoor temperature, leading to unbearable conditions.

Remember that :

  • a low solar factor g is advantageous in summer (reduced effect of the sun);

  • a low U g coefficient will be of interest in winter (less heat loss).

It will therefore be necessary to choose between these g-values and U g ...

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