| as the heat source | 9 | purpose |
| to carry cooling | 4 | purpose |
| from lakes | 2 | location |
| heat pump → use → water | 9 |
| heat pump → use → ground water | 7 |
| heat pump → be → water | 3 |
| heat pump → produce → water | 3 |
| heat pump → provide → water | 3 |
| negative | neutral | positive |
| 0.064 | 0.799 | 0.138 |
| Raw frequency | 25 |
| Normalized frequency | 0.414 |
| Modifier score | 0.900 |
| Perplexity | 384.674 |