How to Become an HVAC Apprentice in Ontario
Ontario's 313A refrigeration and air conditioning mechanic apprenticeship: 9,000 hours, entrance requirements, finding a sponsor, apprentice wages, and the certifying exam.
How to Become a Refrigeration and Air Conditioning Mechanic Apprentice in Ontario
Ontario's 313A refrigeration and air conditioning systems mechanic apprenticeship: 9,000 hours (8,280 on the job, 720 in school across three levels), compulsory-trade status, finding a sponsor, and the Certificate of Qualification exam.
Applies in: Ontario
The path in one paragraph
Ontario runs refrigeration and air conditioning apprenticeship through Skilled Trades Ontario as the Refrigeration and Air Conditioning Systems Mechanic (313A) program: find a sponsor, sign a Registered Training Agreement, then spend about five years logging 8,280 hours of paid on-the-job training interspersed with three levels of in-school training totalling 720 hours. Write the Certificate of Qualification exam at the end, with the Red Seal endorsement available with it. The trade is compulsory in Ontario, so every hour on the tools must be worked as a registered apprentice or a certificate holder. The work itself spans homes, shops, supermarkets, factories, and plant rooms: any system that moves heat out of a space and keeps it out.
First: compulsory means registration is not optional
Ontario classifies trades as compulsory or voluntary, and 313A sits in the compulsory camp. Job Bank states the national position for heating, refrigeration and air conditioning mechanics (NOC 72402): certification is compulsory in Nova Scotia, New Brunswick, Quebec, Ontario, Manitoba, Saskatchewan, and Alberta, and available but voluntary elsewhere. The practical consequence is the opposite of a voluntary trade: you cannot start earning hours informally and sort out the paperwork later. Hours only count once a Registered Training Agreement ties you to a sponsoring employer, and working the trade outside that structure is not permitted. Treat the registration as step one, not paperwork.
Two distinctions prevent expensive confusion. First, 313A is not 313D. The 313D Residential Air Conditioning Systems Mechanic trade is a separate, shorter Ontario trade covering residential air conditioning only, while 313A covers residential central air conditioning plus commercial and industrial refrigeration and air conditioning and combined heating, ventilation, and cooling systems. A posting that says 313D is not a 313A posting. Second, the trade credential is not the whole regulatory picture. Refrigerant handling and gas-fired equipment each sit under separate certificate and licensing systems, covered in the final FAQ. The apprenticeship registration authorizes the trade work; it does not by itself authorize every task on every system.
Step 1: Meet the entrance requirements
Skilled Trades Ontario lists the academic entry grade for the 313A trade as grade 10. That is the floor, not the recommended level: the classroom levels run on applied math, science, electricity, and blueprint reading, and arriving with grade 12 math and science makes the school blocks materially easier. The general Ontario apprenticeship pattern also requires legal permission to work in Canada with a valid social insurance number and being at least 16 years old, and a sponsor in Ontario is mandatory. The application goes through Skilled Trades Ontario, usually after the employment offer is in hand.
If you are missing the grade 10 credential or the math and science background, look for upgrading options before the application, not after a rejection. Adult learning, online credits, and college pre-trades pathways all exist, and a sponsor who sees the upgrading already done is a sponsor who sees a lower-risk hire.
Step 2: Find a sponsoring employer and register the agreement
The sponsor search is where most apprenticeships stall, and this trade has a wide target list. Refrigeration and air conditioning mechanics install, maintain, repair, and overhaul residential central air conditioning systems, commercial and industrial refrigeration and air conditioning systems, and combined heating, ventilation, and cooling systems. The employers are HVAC and refrigeration contractors, mechanical contractors, supermarket refrigeration service firms, cold-storage operators, food processing plants, and the maintenance departments of hospitals, universities, and large commercial buildings.
Approach them directly and through the union route. UA Local 787 is the Ontario local for refrigeration workers and runs apprenticeship training for the trade; a union apprenticeship means structured wage progression and a training centre, with competitive and often seasonal intakes. Non-union contractors hire face to face and through job boards. Either way, the Registered Training Agreement is drafted through the apprenticeship system and signed by you and the sponsor, and registration with Skilled Trades Ontario is what starts the hour count.
Step 3: Work through the five-year program
The program is 8,280 hours of on-the-job training, described by Skilled Trades Ontario as approximately five years, plus 720 hours of technical training. The on-the-job hours are paid work with your sponsor, under a journeyperson, and the skills you demonstrate are signed off in the training standard logbook as you demonstrate them. A level is not complete because the calendar turned: the hours and the competencies both have to be there.
The work itself is seasonal in a way office work is not. Summer brings air conditioning breakdowns and rooftop work in heat; winter brings heating-side and refrigeration work in cold plant rooms; supermarket refrigeration runs year round and fails at the worst hours. Expect on-call rotations, work at heights, and work in confined plant rooms. The physical demands are real but different from the heavy construction trades: the load is more often a compressor, a coil, or a cylinder than a structural member, and the precision demand is higher, because a brazed joint that leaks refrigerant fails the whole system.
Step 4: Do the three school levels
Technical training is 720 hours, delivered as six months across three levels of 240 hours each. Conestoga College delivers the program as three 240-hour levels at its Cambridge campus, conferring an Ontario College Certificate titled Refrigeration and Air Conditioning Systems Mechanic Apprenticeship on completion of the in-school program. Centennial College delivers three levels, basic, intermediate, and advanced, at its Progress Campus. The program covers the design, installation, and service techniques of refrigeration and air conditioning systems, with theoretical knowledge and practical training to complement the on-the-job experience.
Sequencing is fixed: the levels are taken in order, and a registered apprentice is invited to each block through the apprenticeship system. Fees are set by Skilled Trades Ontario as per the offer of classroom training, and books, safety equipment, tools, and parking fees are additional. This guide does not quote a per-level fee, because no current figure was verified on a Skilled Trades Ontario or college page at the time of writing. Confirm the number with the delivering provider before you budget, and apply for Employment Insurance and federal apprentice supports before the block starts, since late applications for income support during training can be denied.
Step 5: Write the exam and hold the credential
The finish line is the Certificate of Qualification exam. Passing it earns the Ontario Certificate of Qualification in the 313A trade, and the Red Seal endorsement is available to qualified mechanics on successful completion of the interprovincial Red Seal examination, according to Job Bank. The endorsement is the portable piece: it is recognized in every Canadian jurisdiction, which matters in a trade where certification is compulsory in seven provinces and voluntary in the rest.
Experienced workers who have not completed an Ontario apprenticeship but have equivalent qualifications or experience can use the Trade Equivalency Assessment Process, according to Skilled Trades Ontario. That is an equivalency question, not a shortcut: expect the Canadian standard, including code, refrigerant, and safety knowledge, to be the adjustment, and check Skilled Trades Ontario's current eligibility rules before banking on it.
After the ticket: where Ontario 313A mechanics go
A certified 313A mechanic is a platform, not a ceiling. The common branches are supermarket and commercial refrigeration, industrial refrigeration including ammonia systems, building HVAC service, and controls and building automation work, each with its own further certificates. Heat pumps and electrification are the growth story: every building that drops a furnace for a heat pump needs a refrigeration mechanic to install and service it, and the trade's refrigeration core is exactly the skill the heat pump market buys. The Red Seal endorsement keeps that work portable across Canada. The certificate gets you hired; the range of systems you can diagnose without a callback is what sets the rate after it.
Related guides:
- How to Become a Refrigeration and Air Conditioning Mechanic Apprentice in Alberta
- How to Become a Plumber Apprentice in Ontario
- How to Become an Electrician Apprentice in Ontario
- How to Become a Steamfitter Apprentice in Ontario
- How to Become a Gas Technician in Ontario
- Apprenticeship Financial Support in Canada
- How to Get Your Red Seal Endorsement in Canada
- How to Start Job Hunting in Canada
The Ontario 313A apprenticeship, step by step
- Meet the entry barAcademic entry grade 10, plus a sponsor in Ontario and legal permission to work in Canada.
- Find a sponsor and registerAn HVAC or refrigeration contractor hires you and you sign a Registered Training Agreement with Skilled Trades Ontario.
- Work the trade and log hours8,280 hours of on-the-job training with your sponsor, about five years at the standard pace.
- Do the three school levels720 hours of technical training in total, in three levels of 240 hours each.
- Write the certifying examThe Certificate of Qualification exam is the finish line, and the Red Seal endorsement is available with it.
Questions people ask
How long does a refrigeration and air conditioning mechanic apprenticeship take in Ontario?
About five years at the standard pace. Skilled Trades Ontario sets the 313A program at 8,280 hours of on-the-job training, described as approximately five years, plus 720 hours of technical training delivered as six months across three levels. Conestoga College delivers the in-school portion as a 720-hour program in three 240-hour levels, and Centennial College describes the apprenticeship as taking three to five years including approximately 8,000 hours with an employer. The pace depends on steady work with your sponsor and on school block timing, so five years is the planned length, not a promised finish date.
Is refrigeration and air conditioning mechanic a compulsory trade in Ontario?
Yes. Job Bank, for heating, refrigeration and air conditioning mechanics under NOC 72402, states that trade certification for refrigeration and air conditioning mechanics is compulsory in Nova Scotia, New Brunswick, Quebec, Ontario, Manitoba, Saskatchewan, and Alberta, and available but voluntary in all other provinces and the territories. In Ontario that means you must be a registered apprentice or hold the Certificate of Qualification to do the work. Do not confuse 313A with the residential trade, 313D Residential Air Conditioning Systems Mechanic, which is a separate, shorter trade: the 313A trade covers residential central air conditioning systems as well as commercial and industrial refrigeration and air conditioning systems and combined heating, ventilation, and cooling systems.
What are the entrance requirements for the 313A apprenticeship?
Skilled Trades Ontario lists the academic entry grade for 313A as grade 10. The pattern for Ontario apprenticeships generally also requires legal permission to work in Canada with a valid social insurance number, being at least 16 years old, and, critically, a sponsoring employer in Ontario before you register. The application goes through Skilled Trades Ontario and is usually completed after you have the employment offer in hand. A sponsor in the trade matters more than a pre-apprenticeship certificate: the Registered Training Agreement is what starts the hour count, and hours worked before it is signed do not count.
How do you find an employer to sponsor a 313A apprenticeship in Ontario?
Approach the employers who install, maintain, repair, and overhaul refrigeration and air conditioning systems: HVAC and refrigeration contractors, mechanical contractors, supermarket and cold-storage service firms, and institutional maintenance departments. The trade description itself names the work: residential central air conditioning systems, commercial and industrial refrigeration and air conditioning systems, and combined heating, ventilation, and cooling systems. Walk in with a short resume that shows the grade 10 entry bar is met and that you can work at heights, in plant rooms, and on rooftops in all weather. Union route: UA Local 787 represents refrigeration workers in Ontario and sponsors apprentices through its training centre. Either way, registration goes through Skilled Trades Ontario.
What does the in-school training cover, and where is it delivered?
The in-school portion is 720 hours across three levels of 240 hours each, covering the design, installation, and service techniques of refrigeration and air conditioning systems in residential and commercial buildings, according to Centennial College, with theoretical knowledge and practical training to complement on-the-job experience, according to Conestoga College. Conestoga delivers the three levels at its Cambridge campus and Centennial at its Progress Campus in Toronto, and other Ministry-funded training delivery agents deliver the levels elsewhere in the province. A registered apprentice receives an invitation to each school block through the apprenticeship system rather than applying through the regular college application system. Fees are set by Skilled Trades Ontario as per the offer of classroom training, according to Conestoga, and books, safety equipment, tools, and parking are additional: this guide does not quote a fee figure, because no current per-level figure was verified on a Skilled Trades Ontario or college page at the time of writing.
What other certificates does a 313A mechanic need?
The 313A Certificate of Qualification is the trade credential, and the Red Seal endorsement is available to qualified mechanics on successful completion of the interprovincial Red Seal examination, according to Job Bank. Work beyond the trade credential can need separate certificates, and this is where new entrants get caught out: handling refrigerants sits under ozone-depletion and refrigerant-handling rules, and work on gas-fired equipment sits under a separate Technical Standards and Safety Authority licensing system for gas technicians. This guide does not state which additional certificate your first job needs, because that depends on the equipment you touch. Ask Skilled Trades Ontario and your sponsor, before you start work on a system, which certificates the work in front of you requires, and do not handle refrigerants or gas-fired equipment on the assumption that the apprenticeship registration alone covers it.
Sources
- Skilled Trades Ontario, Refrigeration and Air Conditioning Systems Mechanic (313A) trade page (trade description covering residential central air conditioning, commercial and industrial refrigeration and air conditioning, and combined heating, ventilation, and cooling systems; academic entry grade 10; on-the-job training 8,280 hours, approximately five years; technical training 720 hours, six months across three levels; Trade Equivalency Assessment Process for experienced workers)
- Conestoga College, Refrigeration and Air Conditioning Systems Mechanic Apprenticeship (720-hour program, three 240-hour levels; fees set by Skilled Trades Ontario as per the offer of classroom training; books, safety equipment, tools, and parking additional)
- Centennial College, Refrigeration and Air Conditioning Systems Mechanic Apprenticeship (three levels, basic, intermediate, and advanced; three to five years including approximately 8,000 hours with an employer; design, installation, and service techniques in residential and commercial buildings; exam for the certificate of qualification at the conclusion of the apprenticeship)
- Job Bank, Refrigeration Technician in Canada job requirements (NOC 72402; three- to five-year apprenticeship program; trade certification compulsory in Nova Scotia, New Brunswick, Quebec, Ontario, Manitoba, Saskatchewan, and Alberta; Red Seal endorsement available on successful completion of the interprovincial Red Seal examination)
Where a figure could not be verified on a Skilled Trades Ontario, college, or Job Bank page at the time of writing — the current per-level tuition fee, any wage figure, and the Certificate of Qualification examination pass mark — this guide says so and points to Skilled Trades Ontario or the delivering college instead of carrying a secondary source's figure. Check those pages before you pay anything or plan around a wage or an exam date.