Louis, MO, you will successfully install air conditioners, furnaces, heat pumps, ductless systems, ductwork, boilers, and accessories (air filter, thermostats etc.) for commercial and residential customers. Physical Demands/Working Conditions: To adequately perform the duties of this job, the employee is regularly and routinely required to sit, stand, walk, kneel, squat, stoop hands to finger, handle controls; hear, and talk.