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Co-ownership: how to save up to 30% on heating… without work

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Co-ownership: how to save up to 30% on heating… without work

Despite the tariff shield on gas and electricity prices, recently extended to all collective housing, many co-owners are facing the explosion of their energy costs. In this context, and while the government is also calling on the French to be more sober, it has never been so urgent to reduce the consumption of buildings. Obviously, for this, the best solution would be to undertake the energy renovation of a maximum of collective housing. Only here, between the realization of the audits, the identification of the work to be carried out, their adoption in general assembly, the contractualization with the companies in charge of carrying them out… these major projects take one to two years minimum. Not to mention their cost, which often puts owners off.

Fortunately, other solutions that are simpler to implement make it possible to significantly reduce the consumption of buildings. And in particular on the heating, which constitutes the first item of expenditure of the copros. “The buildings are considerably overheated, because there are huge temperature differences between apartments, says Eric Lenne, founder of the company Efficap. So that, for all the dwellings to reach an average temperature of 21°C, it is sometimes necessary to set a much higher heating setpoint, up to 24 or 28°C in certain lots.” Results: the hottest apartments open the windows to regulate themselves, resulting in a phenomenal waste of energy.


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His solution? Equip the living room of certain model apartments with small probes that record the temperature and hygrometry (the humidity of the air), in order to accurately map the heating consumption of the building and any malfunctions. “This allows us to divide the apartments into three groups: those who behave normally, those who are too hot and those who are too cold”, details Eric Lenne. Then, the heating engineer visits each apartment to analyze the results and correct any anomalies, if any.

Second step: Efficap manages the heating remotely to reach a target temperature and thus reduce the consumption of the building without reducing comfort in the apartments. “In agreement with the heating engineer, we connect a small automaton to the boiler which will regulate the temperature of the water sent to the radiators, according to the outside temperature. When it is 12°C for example, there is no point in sending water at 80°C. 35°C is enough”, illustrates the boss of Efficap. Controlled by the heating engineer – who therefore no longer even needs to move -, this small automaton records consumption data every two minutes, which makes it possible to control the boiler room in real time. And with the probes placed in the control apartments, the latter can directly see the effect of changes in parameters on the temperature of the apartments… and modulate accordingly if necessary.


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Last stage of the rocket: the company has developed a predictive system to control the heating according to future temperatures. “We use temperature, solar radiation, wind and rain data over three days, which allows us to anticipate weather conditions and control heating, taking into account the inertia of the building”, explains Eric Lenne. The objective is always to have a constant temperature in the building. “If the temperature falls, for example, to 4°C during the night and it is expected to rise to 19°C during the day, the target temperature of 18°C ​​will be quickly reached. There is then no point in heating until midday: it is possible to turn off the heating from 5 a.m. and maintain a pleasant temperature, until the solar radiation takes over and heats the apartments”, explains Efficiency. What save several hours of heating during the day.


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Taken together, these small gains represent colossal savings! “These different combined actions allow 10 to 20% savings in heating on average and we have already achieved more than 30% on certain residences”, affirms Eric Lenne. And all for a very small investment. Efficap assures that by deducting the aid available (in particular energy saving certificates), a co-ownership of a hundred lots would pay for its solution between 10,000 and 15,000 euros all inclusive (probes, assistance and advice service for the heating management and the weather prediction service), for savings on the bill of nearly 10,000 euros from the first year. “Obviously it depends on each building. But, once the condominium is equipped, we undertake that the price of our subscription (24 euros per year and per apartment) does not exceed 30 to 40% of the savings generated, so that the total cost is amortized as quickly as possible. possible,” says the expert.


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In conclusion, he recalls that these approaches are all the more relevant when they come in addition to an energy renovation of the copro. “Our offer remains complementary to improving the performance of the building. But it can be deployed upstream of the work, to save on its energy costs and release funds without too much effort to finance the site,” he underlines.

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