| much more | 7 | degree |
| at heating homes than electric power | 6 | other |
| highly | 5 | degree |
| propane → be → efficient | 28 |
| propane → be → more efficient | 20 |
| propane → deliver → efficiency | 3 |
| propane → be → more energy efficient | 3 |
| negative | neutral | positive |
| 0.015 | 0.203 | 0.783 |
| Raw frequency | 54 |
| Normalized frequency | 0.827 |
| Modifier score | 0.500 |
| Perplexity | 188.333 |