Production
Stationary Engineers and Boiler Operators
- Median pay
- $78,620
- Outlook
- As fast as average
High school diploma
- Operations Monitoring
- Operation and Control
- Active Listening
SOC 49-9021.00Bright outlook
Install or repair heating, central air conditioning, HVAC, or refrigeration systems, including oil burners, hot-air furnaces, and heating stoves.
Data verified Nov 2026 · CollegesRef 2026–27 edition
Source: BLS 2025 wages · 2025–35 projections
Annual pay range
409,670 people work in this occupation.
In short
Heating, air conditioning, and refrigeration mechanics and installers set up and fix climate control and cooling systems. The career offers a median annual pay of $61,010 and is projected to grow much faster than average.
Written with AI from the BLS, O*NET and CareerOneStop data on this page. Every figure is checked against that data before it is published.
Install or repair heating, central air conditioning, HVAC, or refrigeration systems, including oil burners, hot-air furnaces, and heating stoves.
Usually vocational training, an associate degree or related experience.
People in this career install, maintain, and repair climate control systems, including central air conditioning, oil burners, hot-air furnaces, and refrigeration units. On a daily basis, workers inspect equipment, gather information, and troubleshoot mechanical issues. They must make decisions to solve complex problems and safely repair or maintain machinery.
This work is highly realistic and hands-on, requiring strong skills in operations monitoring, equipment selection, and physical installation. Workers must understand building and construction, mechanical systems, design, and public safety. Because they interact with clients and coordinate tasks, knowledge of customer service and administration is also important. Successful technicians show dependability, attention to detail, cautiousness, and cooperation while working under pressure.
To enter this field, candidates typically earn a postsecondary certificate. This career generally requires medium preparation, which can also include vocational training, an associate degree, or related on-the-job experience. Students often major in environmental control technologies or heating, air conditioning, ventilation, and refrigeration maintenance technology.
Depending on the location, some states list a license for this work. Professionals can also earn various industry certifications to demonstrate their expertise. Examples of these credentials include the Air Conditioning and Heat Pump Professional, the Air Leakage Control Installer, the Basic Refrigeration and Charging Procedures Certification, the Carbon Monoxide Safety Certification, and the Certified Chimney Professional.
The median annual pay for these mechanics and installers is $61,010. Earnings vary based on experience and location, with the lowest 10% earning less than $40,050 and the highest 10% earning more than $95,210.
With 409,670 people currently employed, the field is expanding rapidly. Employment is projected to grow by 10.9% from 2025 to 2035, which is much faster than average. This growth, combined with retirement and turnover, is expected to result in 40,600 job openings each year.
Interest code RCI. Compare it with yours
AC Installer (Air Conditioning Installer) · AC Mechanic (Air Conditioner Mechanic) · AC Service Tech (Air Conditioning Service Technician) · AC Servicer (Air Conditioning Servicer) · AC Tech (Air Conditioning Technician) · Air Balancing Technician (Air Balancing Tech) · Baseboard Heating Installer · Commercial HVAC Service Tech (Commercial Heating, Ventilation, and Air Conditioning Service Technician) · Commercial HVAC Tech (Commercial Heating, Ventilation, and Air Conditioning Technician) · Commercial Refrigeration Service Technician (Commercial Refrigeration Service Tech)
Career pathway
Interests that fit the work, the career, majors that lead there and colleges whose graduates in those majors earn the most. Hover or focus a step to follow one path.
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Majors
Colleges
College Scorecard program outcomes
Programs that lead to this career, ranked by what their graduates earn four years after finishing. Earnings are for graduates who received federal aid.
Rochester, NY · Environmental Control Technologies/Technicians · Bachelor's
Boone, NC · Environmental Control Technologies/Technicians · Bachelor's
Raleigh, NC · Environmental Control Technologies/Technicians · Bachelor's
Source: U.S. Department of Education College Scorecard field-of-study data, 2025. Programs with few graduates are not listed.
NCES CIP–SOC crosswalk
Related programs by four-digit CIP code. They are common routes in, not the only ones.
283 colleges offer it
CareerOneStop
What heating, air conditioning, and refrigeration mechanics and installers may need beyond a degree, where a license is required, and what the work pays in each state.
Core certifications employers recognise for this work. Showing 12 of 50.
Programs of study that prepare people for this work.
37 states list a license for this work. Open your state for the license and the agency that issues it.
Licensed HVAC Contractor
Alabama Board of Heating,Air Conditioning and Refrigeration Contractors
Licensed Refrigeration Contractor
Alabama Board of Heating,Air Conditioning and Refrigeration Contractors
Mechanical Administrator
Motor Vehicle Air Conditioning Technician
Air Conditioning Electrician
Arkansas Board of Electrical Examiners, Arkansas Department of Labor and Licensing
HVAC/R Contractor
Registrant
Air and Water Balancing Limited Specialty Contractor
Contractors State License Board, Department of Consumer Affairs
Drilling, Blasting and Oil Field Work Limited Specialty Contractor
Contractors State License Board, Department of Consumer Affairs
Refrigeration Contractor
Contractors State License Board, Department of Consumer Affairs
Warm-Air Heating, Ventilating and Air-Conditioning Contractor
Contractors State License Board, Department of Consumer Affairs
Water Conditioning Contractor
Contractors State License Board, Department of Consumer Affairs
Water Conditioning Contractor
Board of Plumbers, Division of Professions & Occupations, Department of Regulatory Agencies
Water Conditioning Installer
Board of Plumbers, Division of Professions & Occupations, Department of Regulatory Agencies
Heating, Piping & Cooling Limited Contractor
Occupational & Professional Licensing, Department of Consumer Protection
Heating, Piping & Cooling Limited Journeyperson
Occupational & Professional Licensing, Department of Consumer Protection
Mechanical Contractor
Occupational & Professional Licensing, Department of Consumer Protection
Medical Gas & Vacuum Systems Contractor
Occupational & Professional Licensing, Department of Consumer Protection
Medical Gas & Vacuum Systems Journeyperson
Occupational & Professional Licensing, Department of Consumer Protection
Water Treatment Plant Operator - Conditional
Permits and Licenses, Department of Environmental Protection
Master HVACR
Master HVACR - License by Reciprocity
Master HVACR Restricted
Master HVACR Restricted - License by Reciprocity
Temporary Master Plumber or HVACR
Refrigeration and Air Conditioning
Occupational & Professional Licensing Administration, Department of Consumer & Regulatory Affairs
REFRIGERATION/AIR CONDITIONING
Occupational & Professional Licensing Administration, Department of Consumer & Regulatory Affairs
Airmen Other Than Flight Crewmembers (Mechanics)
Regulation and Certification, Federal Aviation Administration
Airmen Other Than Flight Crewmembers (Mechanics)
Regulation and Certification, Federal Aviation Administration
Certified Air Conditioning Contractor, Class A
Division of Professions, FL Dept. of Business and Professional Regulation
Certified Air Conditioning Contractor, Class B
Division of Professions, FL Dept. of Business and Professional Regulation
Certified Air Conditioning Contractor, Class C
Division of Professions, FL Dept. of Business and Professional Regulation
Certified Mechanical Contractor
Division of Professions, FL Dept. of Business and Professional Regulation
Provisional Mechanical Plans Examiner
Division of Professions, FL Dept. of Business and Professional Regulation
Registered Air Conditioning Contractor, Class A
Division of Professions, FL Dept. of Business and Professional Regulation
Registered Air Conditioning Contractor, Class B
Division of Professions, FL Dept. of Business and Professional Regulation
Registered Air Conditioning Contractor, Class C
Division of Professions, FL Dept. of Business and Professional Regulation
Registered Mechanical Contractor
Division of Professions, FL Dept. of Business and Professional Regulation
Conditioned Air Restricted
Conditoned Air Non-Restricted
HVAC Apprentice
Idaho Heating, Ventilation & Air Conditioning (HVAC) Board, Idaho Division of Building Safety
HVAC Contractor
Idaho Heating, Ventilation & Air Conditioning (HVAC) Board, Idaho Division of Building Safety
HVAC Journeyman
Idaho Heating, Ventilation & Air Conditioning (HVAC) Board, Idaho Division of Building Safety
HVAC Specialty Apprentice
Idaho Heating, Ventilation & Air Conditioning (HVAC) Board, Idaho Division of Building Safety
Heating, Ventilation and Air Conditioning Apprentice
Heating, Ventilation and Air Conditioning Contractor, Master
Heating, Ventilation and Air Conditioning Duct Mechanic, Limited
Heating, Ventilation and Air Conditioning Installer Mechanic
Heating, Ventilation and Air Conditioning Mechanic, Journeyman
Medical (gas Vacuum System Verifier)
State Plumbing Board of Louisiana
Manufactured Housing Mechanic
Motor Vehicle Inspection Mechanic, Certified
Oil Burner Technician, Apprentice
Oil Burner Technician, Journeyman
Oil Burner Technician, Master
HEATING, VENTILATION, A/C, & REFRIGERATION APPRENTICE
HEATING, VENTILATION, A/C, & REFRIGERATION CONTRACTOR
HEATING, VENTILATION, A/C, & REFRIGERATION INACTIVE LIMITED CONTRACTOR
HEATING, VENTILATION, A/C, & REFRIGERATION INACTIVE MASTER
HEATING, VENTILATION, A/C, & REFRIGERATION INACTIVE MASTER RESTRICTED
HEATING, VENTILATION, A/C, & REFRIGERATION INSPECTOR
HEATING, VENTILATION, A/C, & REFRIGERATION JOURNEYMAN
HEATING, VENTILATION, A/C, & REFRIGERATION JOURNEYMAN RESTRICTED
HEATING, VENTILATION, A/C, & REFRIGERATION LIMITED LICENSE
HEATING, VENTILATION, A/C, & REFRIGERATION MASTER
HEATING, VENTILATION, A/C, & REFRIGERATION MASTER RESTRICTED
OIL BURNER TECHNICIAN
REFRIGERATION APPRENTICE
REFRIGERATION TECHNICIAN
THEATRICAL BOOKING AGENT
Regulatory, licensing and inspection agency, Department of Public Safety
Mechanic, Master
Mechanical Contractor
Bureau of Construction Codes, Michigan Department of Licensing and Regulatory Affairs
Motor Vehicle Specialty Mechanic
Commercial Mechanical Control Permit
Journeyman (Conditional/Limited/Journeyman) Sprinkler Fitter Certification
Mechanical Contractor Bond
Medical Gas Certification Registration
Unlicensed Individual -Water Conditioning Installer
Water Conditioning Contractor
Water Conditioning Installer -Journeyman
Water Conditioning Installer -Master
Wells and Borings: Limited Bored Geothermal Heat Exchanger Contractor
Division of Health Policy and Systems Compliance, Minnesota Department of Health
Heating And Air Conditioning Mechanics And Installation
Automotive Service Technicians and Mechanics
Division of Career Education, Department Of Elementary and Secondary Education
Medical Gas Installer
Plumbing and Heating Contractor (C1)
Refrigeration and Air Conditioning Contractor (C21)
HEATING, VENTILATION, AIR CONDITIONING AND REFRIGERATION CONTRACTOR
State Cemetery Board, Division of Consumer Affairs, Department of Law and Public Safety
REFRIGERATION ENGINEER, BLUE SEAL
Office of Safety Compliance, Department of Labor and Workforce Development
SCALE OR METER MECHANIC
Office of Weights and Measures, Division of Consumer Affairs, Department of Law and Public Safety
Air Quality (Part I "Title V Operation")
Commercial Refrigeration Contractor
Heating Group 1 Contractor (Class 1)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 1 Contractor (Class II)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 1 Technician
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 1 Technician (Private Educational Institution)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 1 Technician (State & Local Government)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 2 Contractor
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 2 Technician
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 2 Technician (State & Local Government)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 2 Technician License (Private Educational Institution)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 3 Contractor (Class I)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 3 Contractor (Class II)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 3 Technician
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 3 Technician (Private Educational Institution)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Heating Group 3 Technician (State & Local Government)
NC Board Examiners of Plumbing Heating & Fire Sprinkler Contractors
Industrial Refrigeration Contractor
Oil Terminal Facilities: Registration
Refrigeration Service Contractor
Safety Equipment Inspection Mechanics/Emission
License & Theft, Division of Motor Vehicles, NC Department of Transportation
Safety Equipment Inspection Mechanics/Regular
License & Theft, Division of Motor Vehicles, NC Department of Transportation
Special Restricted: Plumbing, Heating and Air Conditioning
Transport Refrigeration Contractor
Water Conditioning Apprentices
Water Conditioning Contractors
Water Conditioning Installers
HVAC Certificate
Division of Industrial Compliance, Ohio Department of Commerce
Commercial Drilling and Plugging of Heat Exchange Wells
Mechanical Contractor
Mechanical Journeyman
Apprentice Plumber (Speciality), Solar Heating and Cooling System Installer
Apprentice, Registered (Industrial Trades)
Apprentice Regrigeration and Air Conditioning Technician
Automotive Mechanics
Refrigeration and Air Conditioning Technician
Oil Burnerperson
Professional Regulation, RI Department of Labor and Training
Refrigeration Mechanic
Professional Regulation, RI Department of Labor and Training
HVAC Heating and Air
Mechanical Construction Manager
Mechanical Contractor
Mechanical Qualifying Party
Water Conditioning Apprentice
Water Conditioning Contractor
Water Conditioning Installer
AIR CONDITIONING & REFRIGERATION CONTRACTOR
Oil Burner Installer
Trade Licensing and Certifications, Fire Safety Division, Vermont Department of Public Safety
Propane or Natural Gas Installer
Trade Licensing and Certifications, Fire Safety Division, Vermont Department of Public Safety
HVAC CONTRACTOR
Division of Professional Credential Processing, WI Department of Safety and Professional Services
HVAC QUALIFIER
Division of Professional Credential Processing, WI Department of Safety and Professional Services
LIFT MECHANIC
Division of Professional Credential Processing, WI Department of Safety and Professional Services
REFRIGERANT HANDLING TECHNICIAN
REFRIGERANT RECOVERY OPERATOR
THERMAL INSULATION APPRENTICE
Apprenticeship, Employment and Training, Department of Workforce Development
THERMAL INSULATION HELPER
Apprenticeship, Employment and Training, Department of Workforce Development
THERMAL INSULATION MECHANIC
Apprenticeship, Employment and Training, Department of Workforce Development
Data from CareerOneStop, sponsored by the U.S. Department of Labor (Employment and Training Administration, with the Minnesota Department of Employment and Economic Development). Retrieved November 9, 2026.
Your plan
Courses, majors, colleges, scholarships and a timeline for this career, built from your profile.
Written with AI from the BLS, O*NET and CareerOneStop data on this page. Every figure is checked against that data before it is published.
Workers in this profession are often called AC installers, AC mechanics, air conditioning service technicians, air balancing technicians, or commercial refrigeration service technicians.
Technicians can obtain certifications such as the Air Leakage Control Installer, the Carbon Monoxide & Combustion Analysis Certification, or the Certified Chimney Professional. These credentials help prove specialized skills to employers.
Related careers that require similar mechanical and installation skills include plumbers, pipefitters, and steamfitters, stationary engineers, home appliance repairers, and solar thermal installers.
Every figure on this page comes from these public datasets. Missing values are shown as not reported, never estimated.
Version 31.0
Version 2025-35 · Data year 2025
Version 2025 · Data year 2025
Version 2020 · Data year 2020
O*NET 31.0 Database by the U.S. Department of Labor, Employment and Training Administration (USDOL/ETA). Used under the CC BY 4.0 license. CollegesRef has modified all or some of this information.
Data from CareerOneStop, sponsored by the U.S. Department of Labor (Employment and Training Administration, with the Minnesota Department of Employment and Economic Development). Retrieved November 9, 2026.
Page data updated November 5, 2026.