| Value | Category |
|---|---|
| No possibility of heating | |
| 1 | District (block, thermic water) heating |
| 2 | With central boiler for several dwellings |
| 3 | With central boiler heating one dwelling or detached house |
| 4 | Individual heating of places (with gas convector, stove, fuel radiator, electric radiant heater) |
| 9 | NIU (not in universe) |