| outdoor unit | 0.45 |
| pump the refrigerant | 0.68 |
| compress the refrigerant | 0.61 |
| fail within first year | 0.43 |
| operate at variable spe… | 0.31 |
| increase the pressure o… | 0.25 |
| depend upon the need | 0.25 |
| compress the gas | 0.25 |
| a operating life | 0.25 |
| used to save energy | 0.40 |
| driven by electric motor | 0.31 |
| used at given time | 0.25 |
| replaced by absorber | 0.25 |
| replaced | 0.22 |