A professional who assists air-conditioning installer-servicer, window unit in repairing, servicing, or installing window-mounted air-conditioning units, performing any combination of following duties. Responsibilities include:

• Carries unit from delivery vehicle to work site.
• Assembles window-support brackets, using handtools.
• Cuts opening through wall for insertion of unit, using hammer and chisel.
• Applies caulking compound to excess space between air-conditioner and wall opening.
• Performs other duties as described under helper master title.