I.-Religible for the reduced rate referred to in the first paragraph of Article 278-0 bis are energy renovation services that meet the following conditions:
1° They are carried out in premises that have been completed for at least two years;
2° The premises referred to in 1° of this I are used, or are intended to be used, for residential purposes after the work has been carried out;
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3° These services relate to the fitting, installation, adaptation or maintenance of materials, equipment, appliances or systems designed to save energy or use energy produced from renewable sources by improving:
a) Thermal insulation
a) Thermal insulation;
b) Heating and ventilation;
> c) Hot water production
c) Domestic hot water production;
II.
II -A joint order by the ministers responsible for the budget, housing and energy specifies the nature and content of the services referred to in 3° of I, as well as the characteristics and performance levels of the materials, equipment, appliances and systems referred to in the same 3°.
III – By way of derogation from Article I of this article, the rate provided for in Article 278 applies to services carried out over a period of no more than two years:
1° Which contribute to the production of a new building within the meaning of 2° of 2 of I of Article 257;
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2° After which the floor area of existing premises is increased by more than 10%;
IV.
IV -For the application of I of this article, the lessee of the service must certify in writing that the conditions laid down in I have been met.
This certificate must be drawn up in duplicate.
This certificate is drawn up in duplicate, one of which is given to the taxpayer, who keeps it to support his accounts.
The hirer keeps the other copy for his records.
The hirer keeps the other copy, together with the invoices or notes relating to the services, until 31 December of the fifth year following the issue of the invoices.
The hirer is jointly and severally liable for payment of the additional tax if the information on the certificate proves to be inaccurate due to his fault.