Heating

To calculate the seasonal factors, which depend on both the location of the second home and the season in which it is visited, we have used the degree-hour data available for each climate zone, which can be found in this table. These degree hours can be found in the appendix to the Order of 8 October 2021 modifying the calculation method and the methods for establishing the energy performance diagnosis, available here.

In France, there are three climate zones: H1, the coldest zone, the north-eastern half of France. H2, a temperate zone in the west and south-west. H3, the hottest zone, the south-east of France and French overseas departments and territories.

For our calculations, we have opted for the following assumptions:

• Homes located on the north-west coast, in the countryside or in towns, correspond to the average for zones H1 and H2 < 800 mètres d'altitude
• Les logements situés sur le littoral méditerranéen correspondent à la zone H3 < 400 mètres d'altitude
• Les logements situés en montagne correspondent aux zones H1 et H2 > 800 metres above sea level

We have related this to the average daily degree-hours over the year, to establish the multiplication factors for the average heating degree-hours for one day, whatever the location.

multiplication factors by climate zone and period](https://github.com/incubateur-ademe/nosgestesclimat/assets/55186402/c328fa42-bae6-4391-becf-a31cbaf32201)