| especially | 8 | degree |
| due to efficiency improvements | 2 | cause |
| furnace → be → older | 100 |
| furnace → be on → older side | 7 |
| furnace → be → older than that | 5 |
| negative | neutral | positive |
| 0.315 | 0.535 | 0.150 |
| Raw frequency | 112 |
| Normalized frequency | 0.782 |
| Modifier score | 0.900 |
| Perplexity | 398.361 |