| System used | Efficiency (%)-primary energy use to cooling energy |
| Solar-PV combined with compression chiller | 22.1 |
| Solar thermal-flat plate collectors combined with Adsorption chiller | 22.5 |
| Solar thermal-evacuated tubes combined with Absorption chiller | 48 |
| Solar thermal-parabolic troughs combined with Absorption chiller | 56 |
| Heat pumps using grid electricity1,2 | 105 |
| Compression chillers using grid electricity1 | 45 |