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The Canadian well or Provencal well is an increasingly popular eco-friendly ventilation system. Consisting of buried collectors that capture the outside air, the Canadian well can ventilate your home permanently. But that's not all: it seconds the heating system in winter and replaces air conditioning in summer allowing you significant energy savings.

The different stages of the passage of air in the Canadian well

The Canadian well or air-ground heat exchanger consists of buried collector pipes that capture the outside air, put it at ground temperature and redistribute it into the house. Here are its main components:

  • The air intake, located at least 1m20 above the ground, captures the outside air to transfer it into the well. It is equipped with an anti-pollution filter to which a pollen filter can be added if necessary.
  • Pipes or collectors constitute the well itself. They must be long enough to be effective, most builders recommend a minimum size of 30 meters. Buried between 1m50 and 2m deep, they convert the air to the soil temperature. Essential elements of the Canadian well, they must be flexible, smooth, waterproof and frost-resistant. The most recommended materials are HDPE or high density polyethylene, and polypropylene. Be careful to place the pipes slightly inclined in the ground to avoid excessive condensation and the appearance of mold and bacteria. A bung located at their end allows to evacuate too much moisture.
  • The air is then introduced into the dwelling via uno air intake specific that may or may not be coupled with the mechanical ventilation system (VMC).

The Canadian Well: Basic Principle and Benefits

The Canadian well uses soil geothermal energy: unlike the air, the soil temperature is constant whatever the season (about 15° C to 1m50 deep). By putting outside air in buried pipes or collectors before entering the habitat, the Canadian well can take advantage of the soil temperature.

In winter, the well will send warmer air into the house than the outside air to help heat the heating and reduce its use. Conversely, in summer, the well will provide cooler air than the outside temperature, replacing the air conditioning. The Canadian well provides up to 20% energy savings per year.

Video Instruction: Well Capping Operation