The Ranco Rocket RS Series Hard Start Kits are designed togive your air conditioning and refrigeration units a boost! TheRanco Rocket Hard Start Kits help protect and extend the lifeof expensive compressors and components saving money andenergy. When an air conditioning or refrigeration unit turnson, the compressor powers up to begin the cooling process.Starting a compressor requires 4-8 times more electriccurrent, than running it. Over time, this jolt of power placeswear and tear on the compressor and other importantcomponents. A hard start kit gives the compressor addedpower during system start-up and reduces the amount ofelectricity required. Adding a Ranco Rocket Hard Start to anair conditioning and refrigeration system increases energyefficiency up to 98%.