What component in a system needs to be evaluated for capacity before adding new cooling components?

In evaluating capacity before adding new cooling components, the transformer VA (Volt-Amperes) rating is essential because it indicates the maximum power the transformer can handle. If the load on the transformer exceeds its rating, it can lead to overheating, equipment failure, or a risk of fire. Thus, when planning to add cooling components, one must ensure that the electrical supply, particularly the transformer, can accommodate the additional demand without exceeding its capacity.

This consideration ensures that the overall electrical system maintains efficiency and safety. The other components, such as circuit breakers, condenser units, and compressor units, do play a role in the cooling system but are more focused on managing and distributing the cooling capacity rather than the electrical supply necessary to support it. Hence, verifying the transformer's VA capability is critical in the planning process for expanding system capacity.