If you’ve ever wondered how a motor fires up, it’s all due a little drum-shaped electrical component called a motor start capacitor. These little motor start capacitors increase the starting torque of a motor, allowing it to begin cycling to full speed. These motor run capacitors are found in air conditioners, hot tubs, and some forced-air furnaces. Zoro has a super selection of air conditioner capacitor and furnace capacitors in stock. And in addition to AC unit capacitor items, we also have power factor correction capacitors and capacitor accessories.