| Value | Category | Cases | |
|---|---|---|---|
| 1 | central heating | 155 |
3.3%
|
| 2 | own system | 123 |
2.7%
|
| 3 | other (stove, electric heater, fireplace etc.) | 4071 |
87.9%
|
| 4 | no heating | 265 |
5.7%
|
| 11 | 20 |
0.4%
|