Breadcrumb Home HART Heating, Air Conditioning and Refrigeration (N) HART-1445 HART-1445: Gas and Electric Heating Download Catalog PDF Download Page PDF Program HART Heating, Air Conditioning and Refrigeration (N) Lecture Hours 3 Lab Hours 3 Credit Hours 4 Course Type N Study of the procedures and principles used in servicing heating systems including gas fired furnaces and electric heating systems.Prerequisites: HART-1401.