| no longer | 10 | temporal |
| in temperate climates | 10 | location |
| very | 7 | degree |
| heat pump → be → effective | 83 |
| heat pump → be → most effective | 10 |
| heat pump → be → effective means | 5 |
| heat pump → be → effective way | 3 |
| negative | neutral | positive |
| 0.086 | 0.366 | 0.548 |
| Raw frequency | 101 |
| Normalized frequency | 0.687 |
| Modifier score | 0.725 |
| Perplexity | 359.620 |