3 Wire Hard Start kit is prewired potential relay and start capacitor Reduces time compressor is on high amp start up, which helps prevent the dimming effect of household lighting, and may reduce the sound your compressor makes when it starts up. Helps prolong the life of your Air Conditioners most expensive part- your compressor! Invest in a hard start kit today! 5 year warranty with Maintenance. 1 year Warranty without.