| Value | Category | Cases | |
|---|---|---|---|
| -2 | Refusal to answer | 0 |
0%
|
| -1 | Don't know | 0 |
0%
|
| 1 | District heating | 374 |
15%
|
| 2 | Electric heating | 634 |
25.4%
|
| 3 | Wood/coal fire | 1458 |
58.3%
|
| 4 | Oil | 19 |
0.8%
|
| 6 | gas | 15 |
0.6%
|