7. Canadian well

The term "puits canadien" (which doesn't come from Canada), or "puits provençal", refers to a technical solution for preheating or cooling the air introduced into the home by a ventilation system, using the temperature of the ground around the house. It's a surface geothermal system.

Because of its inertia, the temperature of the ground varies very slowly. The aim is to bring outdoor air into a home at a temperature close to 10 to 20°C, depending on the season.

An alternative to the previous solution is brine wells, which replace air-source geothermal collectors. The principle is similar: the water circuit circulating in the ground captures calories from the ground and releases them to the supply air via an exchange coil (figures