Founded in 1981 by skilled craftsmen, Ecotherm has successfully adapted over the years to market demands and customer expectations. As a result, it has become a major economic player in Savoie, Haute-Savoie, and Ain in the field of window, door, and shutter installation.
In the spring of 2018, Ecotherm decided to expand its facilities to accommodate a more spacious showroom. In July 2021, on its 40th anniversary, the company was taken over by two new executives who are passionate about woodworking. Alexandre Luneau and Bertrand Duprez took over the management of the company, combining their complementary professional backgrounds to grow the business and expand its reach throughout the region.
With a staff of 28, Ecotherm has four branches with showrooms, two of which are located in Haute-Savoie, in Annecy and Douvaine. As part of its regional expansion strategy and following the expansion and renovation of its Douvaine branch, the company acquired Isotec in Chambéry in order to strengthen the presence and image of Finstral in Savoie.
In 2025, it will be in theAin in Cessy that Ecotherm is proud to open a new showroom. This strategic location aims to strengthen the company’s connection with its customers and expand its expertise throughout the Geneva region.
Our showrooms, which cover an area of more than 250 m², allow our customers to explore and try out the products they are interested in purchasing.
Ecotherm has built its reputation by carrying out numerous construction and renovation using Finstral solutions. Recognized for the quality of its PVC, aluminum, and wood products, this brand combines design, advanced technology, and aesthetic appeal.
A Commitment to Sustainability and Social Responsibility
With its RGE RGE (Recognized Environmental Guarantor) certification, Ecotherm demonstrates its expertise in energy-efficient renovation. Furthermore, as a responsible company, Ecotherm is committed to corporate social responsibility. It has implemented a waste management system (for wood, glass, PVC, etc.), demonstrating its commitment to the environment.
High-end, custom-made woodwork
Drawing on the expertise of its highly skilled carpenters, Ecotherm has earned a solid reputation for excellence.
Forty-five years ago, she decided to distribute Finstral windows and doors, a brand known for the reliability, design, and comfort of its products.
Finstral has been a specialist in high-performance windows and entry doors since 1969. With its production facilities located in the heart of the Italian-Austrian Alps, the company manufactures custom-made windows and doors unmatched anywhere in Europe—products that have successfully combined functionality and aesthetics.
By becoming the 2th Finstral distributor in France, Ecotherm has strengthened its expertise in custom window and door fabrication in a region seeking installations with very high energy efficiency!
Ecotherm has received a rating of 4.6 out of 5 based on more than 200 Google reviews (as of June 2026), and 98% of our customers recommend us to their friends and family (according to our customer satisfaction survey conducted among all our customers in 2025).
Highly qualified carpentry teams
The high level of expertise among Ecotherm’s teams ensures excellent installation quality. All of our carpenters are company employees to ensure you receive the best service.
They receive all the training and certifications and have a thorough knowledge of the products. Furthermore, Ecotherm is one of the few window and door manufacturers to hold the IFT certification (Institut Für Fenstertechnik ; a German laboratory in Rosenheim), one of the most rigorous certifications in our industry.
During every service call, they make sure to arrive on time, protect your home, work quickly, and clean up after they’re done. They’re also committed to being available and answering all your questions.
This know-how and savoir-vivre are your guarantee of impeccable workmanship and a perfect finish, to your complete satisfaction.
Our sales representatives are technical experts in their field. They work with our customers to identify the products best suited to their needs, as well as the most appropriate technical solutions.
Our technicians are supported by a specialized design office consisting of three people. This team works closely with architectural firms and project managers to coordinate the work, particularly in the context of comprehensive renovations or when multiple trades are working on the same job site.