A Heat & Frost Insulator applies insulation materials in order to prevent the transmission of heat, cold, sound, and fire.

Heavy-Duty Equipment Technicians repair, overhaul, and maintain mobile heavy-duty equipment used in construction, forestry, mining, material handling, landscaping, land clearing, and farming.

Heavy Equipment Operators operate heavy equipment used in the construction and maintenance of infrastructure and in surface mining and quarrying activities, including backhoes, loaders, graders, dozers, and excavators. Heavy equipment operator specializations include Tractor Loader Backhoe Operator (636A), Excavator Operator (636B), and Dozer Operator (636C).

Hoisting Engineers are involved in the set up and operator of electric-powered cranes. There are three branches, which differ by the amount of weight a crane can lift. Branch 1 (339A) and Branch 2 (339C) are Mobile Crane Operators, while Branch 3 (339B) is for Tower Crane Operators.

Horse Groomers are responsible for the maintenance, health, nutrition, feeding, and grooming of horses.

Horse Harness Makers manufacture, rebuild, and repair a wide variety of harnesses, saddles, saddle trees, and other associated tack for equestrian disciplines.

Horticulturists use their gardening knowledge and skills in a variety of ways and in many different settings. While some may work to maintain formal gardens, others may spend their time tending to golf courses, cemeteries, or parks.

Hydraulic/Pneumatic Mechanics install, maintain, repair, rebuild, or modify existing hydraulic, pneumatic, or fluid systems; controls; and components.

Industrial Electricians install, maintain, test, troubleshoot, and repair electrical equipment and other types of electrical/electronic controls on equipment found in industrial sites or plants.