Breadcrumb 2025-26 Catalog Heat & Air Conditioning ASC 119 ASC 119: FUNDAMENTALS OF GAS HEATING SYSTEMS Download as PDF Class Program Heat & Air Conditioning Credits 3 Lab Hours 4 Theory Hours 1 This course provides instruction on general service and installation for common gas furnace system components. Upon completion, students will be able to install and service gas furnaces in a wide range of applications.