Installs and maintains cooling tower equipment, plate-frame heat exchangers, cooling water treatment equipment, heating systems (all fuel types) to include boilers, unit heaters, furnaces, radiant heating, heat pump systems (geothermal and air source), variable frequency drives, and other emerging technology equipment/systems. Required Minimum Qualifications: Six years of experience in temperature and computerized building environmental automation systems, refrigeration or air conditioning work, including apprenticeship, or has two years of experience in computerized building environmental automation systems and meets the minimum eligibility requirements of ESM I; or four years experience in above plus Journeyman's license; and.