(**) Level of thermal performance of the dwelling in relation to the Regulations
On the basis of technical information of the latest works (if they comply with the latest standard in force) or the year of the construction of the dwelling in order to determine the associated Thermal Regulation (TR). If you are not sure whether the latest insulation works (you can help yourself with invoices with the R of the insulators) comply with the latest standard in force, take the year of construction of the dwelling as a reference.
Thermal standards and regulations are more and more strict. They should be respected. Only dwellings with 2012/2020 thermal regulation or passive houses may consider, under certain conditions, basic powers under 50W per m2.