Déphi Thermique is a French service that helps homeowners and businesses compare quotes from local air-conditioning installers. Through one free, no-obligation online request, customers can receive up to three itemised quotes, with initial responses generally arriving within 48 business hours. The service covers projects across France and includes installation, replacement and maintenance for a wide range of systems: reversible air conditioning, wall-mounted single-split and multi-split units, ducted and cassette systems, units without an outdoor unit, and air-to-air heat pumps. It also supports projects for apartments, offices and shops.

Déphi Thermique connects customers with listed professionals who hold the required certification for handling refrigerants and are described as having professional liability and ten-year construction insurance. Installers can work with major brands and assess each property to determine suitable equipment and installation requirements. The website also provides information about potential savings, including energy-saving certificates for eligible reversible systems and reduced VAT for qualifying renovation work.