This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. One who installs and repairs heating, ventilating, refrigerating, and air-conditioning systems.

n. A person qualified to handle installation and maintenance of piping that carries steam (a highly-skilled task because of the danger of leaks of hot pressurized steam).

n. a craftsman who installs and maintains equipment for ventilating or heating or refrigerating

"Michael Carroll: My father was a steamfitter — as were my uncles, grandfather, brother, and many cousins."

artificer    craftsman    artisan    journeyman