The core activity of Millenergies is to provide services in the field of energy efficiency and building thermics. Specifically, this includes: conducting energy audits and analyses (CECB, Bilan thermique); creating energy certificates (CECB, CECB+); identifying heat leaks and energy losses through thermography; creating reports and expert opinions on building energy efficiency; and advising property owners and builders on planning energy efficiency measures and applying for subsidies.