3E Ingénieurs Sàrl is an engineering firm active in the fields of energy, water and the environment. Founded in 2018 by David Simonnin, an engineer EPFL in Environmental Sciences and Master of Advanced Studies in Building Energetics (EDD-BAT), active for 15 years in Geneva and the French-speaking part of Switzerland, 3E's main customers are architects, property managers, private individuals, industrial services, municipalities and cantons. 3E's services in the fields of Energy, Water and the Environment are offered at several levels:

• Building : Calculation of Heat Expenditure Indices (IDC), Ecoconseils, energy audits, CECB and CECBPlus, energy concepts and projects for the thermal envelope of the building and heating and ventilation installations, variant studies for the replacement of heat production, building permit dossiers, certifications Minergie, subsidy application files, project management assistance for building energy renovation projects (AMOEn)

• Property parks: Energy and CO2 emissions monitoring, Implementation of property park renovation strategies.

• Territory : Territorial energy planning, Energy policy consulting, Spatial analysis and mapping applied to environmental fields (Water, soil and waste)

3E puts its skills at the customer's service to produce a fine analysis of project objectives, context and stakes. This approach enables the customer to identify and measure the overriding stakes of the projects and thus make the best decisions to achieve its objectives.