The copyright 06EA660167 Crankcase Heater Kit with a 52" insert, 73" leads, 180 watts, and 115V is designed to protect compressors in copyright HVAC systems. It works by warming the compressor crankcase to prevent refrigerant migration and oil dilution during off cycles, ensuring reliable startups and reducing wear. https://www.partshnc.com/06ea660167-copyright-115v-180w-52-insert-73-ld-htr