In a water source heat pump application why would one choose to make a large closed circuit fluid cooler selection at 85 EWT 75 LWT 64 WB instead of a smaller unit at 95 EWT 85 LWT 64 WB? I understand the relationship between approach and fluid cooler size. As the approach is increased the fluid cooler size is decreased but what benefits come from selecting such a large unit? Is it that the colder LWT on the larger fluid cooler reduces the work required by the individual heat pumps thus saving energy? In other words, are we trading first cost with energy savings?