| 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) |