| generally | 5 | degree |
| quite | 5 | degree |
| much less | 4 | degree |
| heat pump → be → expensive | 11 |
| heat pump → be expensive to → run | 8 |
| heat pump → be expensive to → install | 8 |
| heat pump → be expensive to → operate | 7 |
| heat pump → be costly to → operate | 4 |
| heat pump → be costly to → run | 3 |
| negative | neutral | positive |
| 0.304 | 0.411 | 0.285 |
| Raw frequency | 41 |
| Normalized frequency | 0.511 |
| Modifier score | 0.850 |
| Perplexity | 133.171 |