• Equipment controlled to operate at slower speed, lower amperage and lower flow rates tend to run cooler with less stress and last longer. Cooling tower fan motors and belts last longer when instantaneous full speed across‑the‑line starts are replaced by gently ramping up VFDs or soft-starters. Cooling tower belts and fan wheels last longer with lower air velocity. Pump impellers, bearings and seals last longer with less chance of cavitation when operated at the optimal speed instead of full speed. Longer equipment life means lower replacement and repair costs.