According to Ademe and the Ministry of the environment 4

The thermometer is well known to scientists: it is sufficient to take action to change the observed phenomenon (a little). This is precisely the objective that a section of the Grenelle 2 Act which will be examined by the Parliament in January. By 2012, condominiums with a heating need to individualize the energy bill to encourage every citizen to have the light hand on his radiators.

The Union of the measure, which brings together industrialists, received support of Ademe and other specialists of the energy savings to impose this lever of reduction of energy consumption, already operated abroad in France.

The first oil shock had inspired an embryo of French regulations in 1974, but it has never been applied because many exemptions. Barely 10 of the housing that should in principle be equipped with dispatchers are, compared to 95 in Germany. Development of individual meters of heating of the past years has benefited from the better reliability of measurement technologies. Director of strategy at the Ista claimant, Gilles Gaillot explains that should ask a sensor by radiator for household consumption.

Bills down 15-30

A single sensor is not enough, because in old installations, as in Paris, the radiators are not necessarily a single feeding by housing. The sensors are electronic thermometers which compare the temperature of the radiator with room, and then communicate the information to a central by radio waves. The module then its addition based on the characteristics of housing: for a same level of adjustment of the radiators, a poorly insulated apartment in Northern gable will be inherently less warm than another well outside South. Measurement provider then draws invoices for the trustee from these data, and not based on the royalty.

For Gilles Gaillot, individual counting is not a technical but behavioral solution. "When the invoice is collective, people prefer to open the window in the winter when they are too hot rather than cutting their radiators", confirms a Parisian trustee. Or simply lowering the temperature of the housing of a degree to save 7 energy. Individualization may therefore be more accurate for small heating consumers and encourage excessive consumers, for example the elderly, to pay attention. A study of Costic, a centre for the study of climate engineering, recalled that individualization removes up to 30 of the private condominium heating Bill. Social Park, this gain would rarely exceed 15, because, unlike the a priori, these units are often better managed by a single decision maker.

According to Ademe and the Ministry of the environment, 4.5 million dwellings can be equipped with either an economy possible from 2 million tonnes of CO2 per year, or EUR 450 million. The average heating bill per household, of 700 euros in France, decrease of 100 euros.

The Association of managers of condominiums (CRA) believes that the distribution of heating costs is, in principle, a good device but which faces some problems. The poor state of radiator valves can distort the measures. And then this solution has no meaning in the absence of isolation. Finally, for the CRA, the device is not always synonymous with economies: "certain contracts of lease-survey (with radio-survey) amounted to EUR 11 HT by year and by radiator." "For a four parts with six radiators, tantamount to 66 euros HT, 79 euros TTC, so much more than the average economy réali-sand", says the association. To reduce this risk, Ista is currently experimenting with 4 residences of social landlords a global service, including the location and survey meters, which guarantees of 5 to 15 energy savings.