Photo of the building dwellings / residential units the RENER climate engineering, thermal and fluid engineering consultancy.

Engineering office specializing in climate control, thermal and fluid mechanics

Our independent Thermal & Fluid Engineering Office ensures the security of your decisions for more efficient, comfortable, and energy-saving buildings. From detailed modeling (Dynamic Thermal Modelling and Operational Energy Simulation) to costed scenarios and engineering design & works supervision, we design and implement solutions that sustainably reduce your energy consumption and emissions, while guaranteeing year-round comfort and regulatory compliance.

⚠️ We do not conduct studies for private individuals.

We cater to several
types of needs

Every energy project is unique.

Improving reliability and comfort

Analyze the state of current facilities in order to propose improvements.

Reduce the energy bill

Consume less and optimize your energy bill, while protecting the planet.

Energy renovation

Extensive rehabilitation requires a sustainable project.

Improve the sustainability of your facilities

Our support through operational performance monitoring of the facilities allows us to optimize their operation.

The expertise of our
thermal and fluid engineering

Photo of a person conducting an energy audit.

Energy audit

We model your building by analyzing in detail the technical data and uses of the building in order to propose costed, prioritized and reasoned work scenarios, aimed at sustainably improving its energy performance.

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Visual representation of an energy performance diagnosis (EPC).

French EPC (DPE) & Multi-Year Works Plan (PPT)

We assess your building's energy performance, identify sources of heat loss, and provide targeted recommendations to improve efficiency, reduce costs, and anticipate future regulatory requirements. In collaboration with our partner architects, we also develop a Multi-Year Work Plan (PPT), which prioritizes the renovation actions needed to improve energy performance and occupant comfort.

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Diagram of the evolution of thermal regulations.

Regulatory calculation

We ensure your compliance (RE2020, tertiary devices, etc.) with certified calculations and operational recommendations, ready to be implemented.

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Photo representing a technical study and diagnosis within the framework of support missions for sustainable and efficient construction or rehabilitation.

Technical studies and diagnostics

We inspect your HVAC/Plumbing installations on site, measure, diagnose malfunctions and design concrete solutions.

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Photo of a engineering design & works supervision document.

Engineering Design & Works Supervision

From PRO/DCE to acceptance, we design the fluid packages, manage the consultation, direct the execution and guarantee quality, deadlines and performance in occupied sites.

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Visual representation of a Dynamic Thermal Modelling.

Dynamic Thermal Modelling and Operational Energy Simulation

The thermal simulation (STD) involves creating a thermal model of the building using STD software, which allows for the estimation of the building's needs based on heat loss, ventilation, solar and internal gains (occupancy, office equipment, lighting). Energy consumption is then estimated based on the production systems.

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Technical room with several large white pipes and valves connected on a concrete wall, supported by the engineering consultancy as part of operational performance monitoring and engineering design & works supervision assistance.

Operational Performance Monitoring & engineering design & works supervision assistance

We structure energy governance, optimize contracts and settings, and ensure that performance commitments are met over time through ongoing dialogue engineering consultancyween occupants and the heating operator.

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Our latest
achievements

Engineering Design & Works Supervision for the renovation of the EFS & ECS networks - Marseille - 2025-2026

Type
Condominium
Dwellings / Residential Units
410
Buildings
2
Floor Area
35,500 m²

Collective Energy Performance Certificate (EPC) + PPT - Marseille - February 2026

Type
Condominium
Dwellings / Residential Units
142
Buildings
1
Floor Area
4,189 m²

Collective Energy Performance Certificate (EPC) + PPT - Marseille - December 2025

Type
Condominium
Dwellings / Residential Units
51
Buildings
1
Floor Area
4,580 m²

The team from the Climate Engineering Engineering Consultancy

The RENER Engineering Consultancy is managed by an experienced and independent team, which guarantees the rigor and technical quality of each mission.

Photo of Carole Clemens, director of the climate engineering, thermal and fluid engineering consultancy.

Carole CLEMENS

Director of the Research Department
c.clemens@rener-fr.com
Photo by Jean-François Fardeau, Manager of the engineering consultancy.

Jean François FARDEAU

Manager
jf.fardeau@rener-fr.com
Photo by Bruno Marongin, energy efficiency project manager.

Bruno Marongin

Energy Efficiency Project Manager
b.marongin@rener-fr.com
Photo by Khadija Sougrati, thermal engineer.

Khadija Sougrati

Thermal engineer
k.sougrati@rener-fr.com

Our latest
publications

Photo representing an energy saving certificate.

Energy Saving Certificate (CEE)

November 2025
Energy suppliers and fuel distributors, known as "obligated parties", must help finance energy renovation work.
Read the article
Ma Prime Rénov' logo

My PrimeRénov' Condominium

September 2025
MaPrimeRénov' Copropriété finances work carried out in common areas to improve the energy performance of the building.
Read the article
A graph of the DPE and PPT results.

French EPC (DPE) & Multi-Year Works Plan (PPT)

March 2024
The decree of March 25, 2024, published in the Official Journal on April 20, 2024, modifies the calculation methods for the French Energy Performance Certificate (DPE) for small dwellings.
Read the article

FAQ for thermal and fluid engineering offices

What specific tasks will you be undertaking?
We carry out: energy audits, EPCs, regulatory calculations, Dynamic Thermal Modelling, HVAC/Plumbing design (from sketches to plans), tender documents/contractor consultation, site monitoring and acceptance, as well as engineering design & works supervision assistance and operational performance monitoring to ensure performance over time.
What is the role of Dynamic Thermal Modelling in your approach?
The STD allows for detailed modeling of the building and measurement of the impact of technical choices (envelope, systems, instructions, occupancy) on winter/summer comfort and energy consumption, in order to arbitrate scenarios before work and optimize the cost/performance ratio.
Can you assist us with obligations and compliance (tertiary sector, co-ownership, etc.)?
Yes. We are framing the data collection, building a monitoring methodology, defining indicators and an action plan to meet the requirements (e.g., regulations applicable to commercial buildings) and prioritizing impactful projects. Our regulatory monitoring informs these processes.
How does a mission start-up proceed and what deliverables will we receive?
1) Initial scoping meeting (objectives, scope, schedule) → 2) Data collection (contracts, diagrams, historical data, building management systems, plans) → 3) Site visits & measurements → 4) Modeling/Structural Analysis and studies → 5) Report & cost estimates (scenarios, ROI, prioritization) → 6) Tender documents & consultation support → 7) Site supervision/acceptance. Deliverables include calculation notes, plans, a decision support report, and tender documents.

Contact
the Engineering Consultancy

Do you have a question? Would you like to contact someone in the engineering consultancy?