| SST | Saturated Suction Temperature |
| MET | Mean Evaporating Temperature (MET) |
| SLE | Superheat Leaving Evaporator (SLE) |
| RGT | Return Gas Temperature (RGT) |
| SDT | Saturated Discharge Temperature |
| MCT | Mean Condensing Temperature (MCT) |
| TLC | Liquid Temperature Leaving Condenser |
| TLE | Liquid Temperature Leaving Economizer (subcooler) |
| TTXV | Liquid Temperature Entering Thermostatic Expansion Valve |
| Tdisc | Compressor Discharge Temperature |
| SIT | Saturated Interstage (mid-stage) Temperature |
| PR | Pressure Ratio |
| THR | Total Heat Rejection at Condenser |
| % HR | Heat Rejection Factor |
| ERE | Evaporator Refrigeration Effect |
| ECon | Economizer Load |
| Mc | Condenser Mass-flow |
| Me | Evaporator Mass-flow |
| Mec | Economizer Mass-flow |
| EER | Energy Efficiency ratio |