Variables Impacting Air Conditioning System Performance

Explanation:

The performance of air conditioning systems is significantly impacted by several factors. Two variables that are particularly crucial are the high-side pressure of the system and the airflow across the condenser. High-side pressure influences the efficiency and capability to move heat out of the refrigerated space. Similarly, adequate airflow across the condenser is essential as it affects the ability to expel heat to the outside environment. If either of these variables is not within the optimal range, the system can perform poorly, leading to increased energy consumption and reduced cooling capacity.

Option 3: high-side pressure and airflow across the condenser are thus the correct variables that have a great impact on the system performance of air conditioning systems, aligning with how the components like the electrically driven compressor and condenser coils function as detailed in the provided references.