Figure,Value ($ billion),Year,Publisher,What it measures
"Receipts of all plumbing, heating and air-conditioning contractors (NAICS 238220)",297.6,2022,"U.S. Census Bureau, Economic Census",Official count; plumbing and HVAC together
HVAC activity receipts inside NAICS 238220 (code 8220),121.74,2022,"U.S. Census Bureau, Economic Census",Official count; HVAC work only
"HVAC plus refrigeration activity receipts (codes 8220, 8225)",129.61,2022,"U.S. Census Bureau, Economic Census",Official count; this report's headline
"HVAC, refrigeration and all mechanical contracting (codes 8220, 8225, 8223)",183.97,2022,"U.S. Census Bureau, Economic Census",Upper bound; mechanical includes piping
HVAC plus refrigeration receipts restated in 2025 dollars,142.58,"2022 work, 2025 prices",HVAC Business Brokers Research Desk (CPI-U),"Price restatement only, not a 2025 estimate"
Heating and Air-Conditioning Contractors market size,159.4,2026 (estimate),"IBISWorld (paid report, free summary)",Proprietary estimate; method not public
US HVAC systems market (equipment),30.41,2023 (estimate),Market-research estimate repeated by Workyard,"Equipment sales, not contractor receipts"