There are many methods which are developed to measure the performance of the AC unit and the HVAC unit. They are also helpful in studying the running costs of the HVAC system. Also, using these metrics we can compare the HVAC systems and pick the right one which is suitable according to the requirement. Now using these metrics is not an easy way, because there are two conditions before you use them to compare the units. The first one is that different metrics cannot be compared. The second one is that when it is difficult to convert one metric to another. Because, then you have to compare the units according to the running costs.
