2. Energy diagnostic methodology

2.1 First levels of organization

Diagnosis is research aimed at understanding and taking action, by identifying the reasons behind a situation and the actions to be taken, considering both cause and effect. It differs from an audit, which is an a posteriori control according to a predefined reference framework.

Energy diagnostics, which are a prerequisite for retrofitting, involve 3 stages:

• assessing the energy performance of existing buildings ;

• identification and evaluation of possible rehabilitation actions ;

• energy diagnostic report.

The overall assessment of an existing building's energy performance can...