Condenser saturation temperature on a air cooled condenser should be higher than the ambient temperature by:

• A. 100 degrees F to 105 degrees F
• B. 90 degrees F to 100 degrees F
• C. 10 degrees F to 15 degrees F
• D. 30 degrees F to 35 degrees F

Answer: (D)

Heat must flow from the refrigerant in the condenser to the surrounding air, so the refrigerant’s saturation (condensing) temperature needs to be higher than the ambient temperature to provide a driving force for that heat transfer. For an air‑cooled condenser, a practical and reliable approach temperature difference is about 30 to 35°F. This margin ensures good condensation and heat rejection across typical outdoor conditions without pushing the compressor to unnecessarily high head pressures. A delta of only 10–15°F would make heat transfer inefficient on hotter days, raising pressures and reducing efficiency, while a delta of 90–100°F would require excessive head pressure and energy. Therefore, 30–35°F above ambient is the appropriate guideline.