No Licenses and Credentials Heating and Ventilation Engineer [Massachusetts] - Massachusetts Board of State Examiners of Plumbers and Gas Fitters required Experience Three years of formal HVAC/refrigeration apprenticeship training required Experience as a licensed HVAC technician 3-5 years required Knowledge, Skills and Abilities - Must be able to read, write and perform arithmetic calculations at a level generally acquired through a high school education. In addition to performing routine installations, maintenance testing, calibrations, and repairing refrigeration systems, heating systems, air conditioning systems, related piping systems, and equipment prepares costing estimates to support a "Fee for Service"; or cost pay back special projects program, and in support of construction and renovation projects program.