Canadian wells

Canadian wells, also called Provencal (due to its use in the French region of Provence), are simple geothermal air conditioning systems. They consist of networks of pipes located in the exterior basement of houses, connected to them and which work on the principle of thermal inertia to adjust the temperature of the air used in the house. This system does not consume electrical energy, so after its installation, the air conditioning in our house will be more economical. Economic, ecological, efficient and sustainable natural technology.

Installation of a Canadian well.

There are places where they are most effective in winter and places where they are most effective in summer. You will now discover the difference.

Its principle of operation is simple, the air that accumulates in the underground pipes is colder than the air in the house in summer, but warmer in winter. We have, without any consumption of electricity, a heat exchange that we will take advantage of to heat in winter and cool in summer.

The most efficient and economical is to install the Canadian well during the construction of the house, since the subsequent installation can be expensive.

This system considerably reduces the demand for energy. It is a very effective bioclimatic strategy to improve the energy efficiency of a building.

Thermal inertia.

This property indicates how much heat a body can hold and how quickly it is transferred or absorbed. It is a property used in construction to preserve the temperature inside the premises throughout the day. During the day, the walls are heated, and at night they transfer heat to the premises, in the summer they absorb heat from the premises through a ventilation system, and at night they are cooled with a similar system.

In the case of Canadian wells, its operating principle is simple. The surface temperature differs from that of the environment, this difference is accentuated and remains stable at a depth of about two meters, where the temperature is generally stable between 18 ° C to 24 ° C. This is accentuated depending on the geographical location and weather conditions. This temperature is called average temperature and if it is pleasant, the building should be connected to the ground. At a depth of 15 meters, the temperature is constant throughout the year.

A Canadian well consists of a series of tubes placed at a certain depth – heat exchanger, which run a certain number of meters under the ground. In these pipes, the air circulates causing an exchange of heat between the circulating air and the earth which surrounds it.

It is very important before thinking of installing a Canadian well, to study the soil to know the classification of the soil according to its thermal conductivity. With this study, we will know if our soil has the appropriate characteristics for the installation of a Canadian well.


Operation in winter.

Canadian well winter operation

In winter, the outside air is colder. The temperature at a depth of two meters is higher than the surface temperature, therefore, when the cold air from the outside circulates through the underground pipes, it warms up. Warm air reaches the house reducing the temperature gradient, allowing the heater to be turned on at a lower temperature or not to be used.

Operation in summer.

Canadian well, operating in summer.

During the summer, the air temperature is higher than the underground temperature. Therefore, when the air passes through the pipes, it transfers heat to the earth and cools, reaching the house several degrees cooler, creating a comfortable environment.

If you want to know a little more about geothermal energy, watch this video.


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