| to trouble | 5 | purpose |
| very | 4 | degree |
| heat pump → be → complex | 4 |
| heat pump → be → more complex | 3 |
| heat pump → be → complex devices | 3 |
| heat pump → be → complicated | 3 |
| heat pump → be → complex machines | 3 |
| negative | neutral | positive |
| 0.394 | 0.502 | 0.104 |
| Raw frequency | 16 |
| Normalized frequency | 0.327 |
| Modifier score | 0.500 |
| Perplexity | 209.627 |