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During the design phase of a Heating, Ventilation, and Air-Conditioning (HVAC) unit, many factors play a key role in the evaluation of system performance. However, the most decisive factors are the actual performance of each component. These components include evaporator, heater, and blower package. Any one of these components can have a dramatic impact on the overall system performance. Current performance evaluation techniques do not allow for the all-around comparison of each component. The special formulas and, respectively, special numerical values have been created for each component comparison problem. These numerical values are either Common Comparison Coefficient (CCC) for component comparison, which this paper centers on or Degree of Comparison for comparison of sealing capabilities. The comparison of test results shows significant advantages and convenience of proposed approach for components evaluation.