Every year, with the onset of the cold, you are torn.

On the one hand, you want to preserve the environment and the planet 's natural resources by opting for an ecological heating system.

On the other hand, you want your home to be comfortable.

To reconcile the two by reducing your electricity bill, geothermal energy may be an option.

But how to install it in its home?

What is geothermal energy?

From the Greek


, earth, and


, hot, geothermal energy means the use of energy stored in the ground in the form of heat. If it can be used by power stations to produce electricity, in individual houses, it is used exclusively for heating, cooling and the production of domestic hot water. This is a so-called “very low energy” geothermal energy (less than 30 ° C), which does not require digging very deeply into the subsoil.

This system works thanks to a heat pump coupled to calorie collectors buried under the surface (the temperature of the earth remaining higher than that of the air in winter, and cooler in summer). These are made up of loops in which a refrigerant circulates in a closed circuit. The energy is then distributed in the house by means of heat emitters: low temperature radiators or underfloor heating.

This technology is aimed at both new and old buildings and can supply individual housing as well as small collective housing.

France has significant geothermal potential, hence the growing interest given to it by the government, which is investing massively in research, the development of power plants and aid to individuals, while simplifying regulations.

Different advantages

The main advantage of geothermal energy is that it is a renewable natural energy source, just like wind or solar power. But unlike the latter, it does not depend on weather conditions, which makes it more reliable and stable over time because it can generate heat and electricity available almost permanently. In addition, it is said to be "clean" because it emits very little CO2 and produces no waste following its use.

Its other advantage is economic. If the initial investment is quite expensive, 20,000 euros on average including installation for individuals, the installations quickly pay for themselves. It is estimated that this system can reduce household energy bills by three, or around 2,300 euros in savings per year. In addition, you can reduce the bill by benefiting from a financial aid envelope of up to more than 14,000 euros under MaPrimeRenov '(installation of a geothermal heat pump) and the heating boost bonus (replacement your old boiler).

According to the Ecological Transition Agency (Ademe), “studies have shown that geothermal energy was the sector that offered the lowest investment cost in relation to the ton of carbon avoided, among all the measures intended to reduce energy consumption. 'energy or to develop renewable energies'.


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The limits of geothermal energy

Geothermal energy is a sustainable but not inexhaustible resource, since the heat reservoir of the deposits ends up diminishing.

However, this drawback affects power plants more than individuals.

Finally, it cannot be considered as 100% renewable because it requires the use of a generator and therefore electricity.

  • Economy

  • Lodging

  • ecology

  • energy

  • Heating

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