Expert Testimony

Philippe Ferlay is a thermal engineer. Researcher, author of '' U bat coefficient measurement of an existing building'' available at the Parisian Editions.

Philippe Ferlay followed the Vermont home every day during a heating season, with a different methodology from that used by CRITT Bois. Here is a summary of his study:

The Vermont house built by Ecoxia Company was analysed during the 2013-14 heating season according to the book 'method of measuring coefficient U bat ', a method that combines an energy calculation and statistical calculations.

If the U bat coefficient is always calculated carefully for a new building, it is however not ' measured ' in situ from surveys of energy consumption. Following the calculation, the Vermont house is characterized by a U bat coefficient (0.4 W / m2K); this value of U bat coefficient is very low in light of generally observed real estate values on the French market.

The method also allows to model the consumption of heating and ventilation depending on unified degree days with a remarkable level of accuracy. In addition, the modelling also mitigates the exceptional mildness of last winter and it results with high statistical confidence levels, the electrical energy absorbed for heating and ventilation would be 24.4 kWh/sqm over normally rigorous heating (2600 DJU and 232 days) in the sense of statistics.

Reported in financial terms, the cost of heating and ventilation during this period amounted to € 447 incl. VAT, a very small amount compared with equivalent spending usually recorded in France.
Results indicate cutting hedge thermal insulation and airtightness but Vermont house also shows a good ability to restore the free heat gains, such as solar heat or internal sources such as heat from the electrical household appliances. This reduces the overall need for heating.
In conclusion, the Vermont house is a technical and economic solution for the current energy transition.