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French energy renovation specialist helping homeowners improve energy efficiency through trusted RGE-certified artisans and public subsidy support.

Last updated September 26, 2026

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Overview

EFFY (formerly CertiNergy) is a French company specialising in energy efficiency and energy renovation of homes. Founded in 2008 by Frédéric Utzmann and Édouard Jounet under the name CertiNergy, the company initially focused on the market for energy savings certificates (Certificats d'économies d'énergie, CEE), a French public policy instrument that gives value to energy savings. It diversified from 2011 into energy efficiency services and expanded its model to other European countries, notably Italy with CertiNergia. In 2013 it launched the experimental 'isolation à 1 euro' offer and operated a national fuel poverty programme under the Ministry of Ecology until December 2015. The acquisition of QuelleEnergie.fr in 2015 strengthened its position with individual consumers, complementing its historical B2B activities with industrial clients, social landlords, local authorities and property companies. In 2019, Effy sold part of its activities, particularly those for businesses and local authorities, to the Engie group as part of a strategic refocus on the residential market; the Effy brand was then created for its consumer-facing activities. In 2022, the company raised €20 million from the investment fund Felix Capital. Today, Effy presents itself as a specialist in energy efficiency, offering homeowners personalised estimates, help obtaining public subsidies (including the Prime Effy financed by the CEE scheme), and access to a network of over 5,000 RGE-certified partner artisans across France. The company claims to have supported more than 100,000 families and to have over 250 employees. Its mission is to make energy renovation accessible to all, with values of proximity, optimism, reliability and expertise. The company is headquartered at 92 avenue des Champs-Élysées in Paris.

History

EFFY was founded in 2008 by Frédéric Utzmann and Édouard Jounet under the name CertiNergy, in the wake of the Grenelle Environment Forum. The company bet on the energy savings market and was among the first to give value to energy savings through the French Certificats d'économies d'énergie (CEE) scheme. From 2011, it diversified its activities into the energy efficiency sector and replicated its model in other European countries, including Italy where CertiNergia was created in 2011. In 2013, the company experimentally launched the 'isolation à 1 euro' offer and operated, under the aegis of the Ministry of Ecology, a national programme against fuel poverty, renewed until December 2015. In 2015, QuelleEnergie.fr, a digital platform specialising in energy renovation work, was acquired. This acquisition strengthened the CertiNergy group's positioning with individual consumers, as it had until then been almost exclusively active with industrial clients, social landlords, local authorities and property companies (B2B). In 2019, Effy sold part of its activities, notably those for businesses and local authorities, to the Engie group as part of a strategic refocus on the residential market. The Effy brand was then created for its consumer-facing activities. In 2022, the company raised €20 million from the investment fund Felix Capital. As of the mid-2020s, Effy presents itself as a specialist in energy efficiency, with over 17 years of experience, a network of 5,000 RGE-certified partner artisans across France, and more than 100,000 families supported. The company has over 250 employees and is headquartered at 92 avenue des Champs-Élysées in Paris.

  • 2022

    €20 million fundraising from Felix Capital.

  • 2019

    Sale of business and local authority activities to Engie group; creation of the Effy brand for consumer activities.

  • 2015

    Acquisition of QuelleEnergie.fr, strengthening positioning with individual consumers.

  • 2013

    Experimental launch of the 'isolation à 1 euro' offer; operation of a national fuel poverty programme until December 2015.

  • 2011

    Diversification into energy efficiency services; expansion to Italy with CertiNergia.

  • 2008

    Company founded as CertiNergy by Frédéric Utzmann and Édouard Jounet.

Products and positioning

Specialist in energy efficiency and energy renovation for homeowners, simplifying access to trusted artisans and public subsidies.

  • Exterior wall insulation

    Insulation of walls from the outside, offering up to +3°C in winter and -3°C in summer.

  • Lost attic insulation

    Insulation of lost attics, offering up to 30% savings on heating bills.

  • Windows and French doors

    Installation of windows and French doors for acoustic and thermal insulation.

  • VMC ventilation

    Installation of mechanical ventilation systems for clean, fresh and renewed air.

  • Floor insulation

    Insulation of floors to eliminate the sensation of cold feet.

Sources6 sources

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