1. Approach summary

The energy performance of existing buildings is difficult to characterize. Indeed, beyond the complex energy issues of existing buildings, performance is a polysemous notion relating to objectives, results and the actions implemented to produce these results, thanks to the means given.

• Performance combines three concepts:

  • Relevance: the relationship between objectives and resources (energy relevance: do the resources deployed during refurbishment correspond to the objectives of reducing energy requirements?

  • efficiency: the relationship between means and results (energy efficiency: is energy consumption minimized for maximum thermal comfort?

  • efficiency: linking results to objectives (energy efficiency: has the rehabilitation...