| every home | 0.68 |
| use natural gas | 0.68 |
| blow cold air | 0.56 |
| use propane | 0.51 |
| last 20-25 years | 0.42 |
| produce heat | 0.38 |
| produce some carbon mon… | 0.37 |
| undergo process | 0.36 |
| help with 80% afue ener… | 0.27 |
| come with igniter | 0.25 |
| help save money | 0.21 |
| a pilot light | 0.33 |
| repaired | 0.47 |
| installed | 0.44 |
| manufactured after janu… | 0.41 |
| replaced | 0.36 |
| installed in basement | 0.33 |
| repaired in such a circ… | 0.32 |
| made in early 1970s | 0.29 |
| equipped with many feat… | 0.25 |
| expensive to install | 0.25 |
| installed in closet | 0.24 |
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