While performing duties of this job, the employee is occasionally required to stand and/or walk for long periods at a time, sit, use of hands and fingers, handle, or feel objects, tools or controls, reach with hands and arms, climb stairs, climb ladders, balance, stoop, kneel, crouch or crawl, talk or hear, or smell. Inspects, troubleshoots, maintains, cleans, repairs, replaces, installs and modifies/upgrades HVAC system chillers, air handers, cooling towers, heating units, air conditioners, coils, condensers, boilers/water heaters, furnaces, piping, valves, control systems, etc.