Most HVAC businesses are started by technicians who are good at the work and tired of making money for someone else. Being a great tech is the foundation, but it's only part of running a company: you also need the right licenses, insurance, prices that cover your real costs, and a steady flow of calls in the shoulder seasons, not just in the first heat wave.
This guide covers the steps in order.
1. Get the experience and certifications first
EPA Section 608 certification is required. Under the Clean Air Act, technicians who maintain, service, repair or dispose of equipment that could release refrigerants must be certified. The EPA offers four types:
| Certification | Covers |
|---|---|
| Type I | Small appliances |
| Type II | High- or very high-pressure appliances (most residential and light commercial AC and heat pumps), except small appliances and motor vehicle AC |
| Type III | Low-pressure appliances (such as many large chillers) |
| Universal | All of the above |
Section 608 credentials don't expire. The EPA also restricts refrigerant sales: refrigerant for stationary equipment can be bought by Section 608 certified technicians, or by employers who give the wholesaler written evidence that they employ at least one.
State and local licensing varies. The Bureau of Labor Statistics notes that some states and localities require HVAC licensing on top of EPA certification. Where a contractor license exists, it typically requires several years of documented experience, a trade exam and often a business and law exam, proof of insurance, and sometimes a bond. Some states license HVAC under a "mechanical" contractor category, and gas work, electrical connections and refrigeration can each have their own rules. Check your state's contractor licensing board and your city or county building department.
Lead-safe work in older homes. If you'll cut into painted walls, ceilings or trim in homes built before 1978, for example for new duct runs or line sets, the EPA's Renovation, Repair and Painting (RRP) rule may apply: firms must be EPA- or state-certified and use certified renovators trained by an EPA-accredited provider. Minor jobs disturbing 6 square feet of paint or less per room inside (20 square feet outside) are exempt, but window replacement and demolition of painted surfaces are always covered.
If you're not there yet, the usual path is an HVAC training program or apprenticeship, Section 608 certification, then years as a technician before applying for a contractor license.
2. Decide what kind of HVAC business you'll run
- Residential service and repair: the most common start. You need less equipment and inventory than installation work, and service calls lead to maintenance agreements and replacement sales.
- Residential replacement and installation: higher ticket jobs and higher margins per job, but more cash tied up in equipment, more crew and more permit work.
- Light commercial: rooftop units, restaurants and offices. Steadier contracts, but different equipment, more paperwork and higher insurance limits.
- New construction: large volume through builders, but thin margins and slow payments.
Many owners start with residential service and add replacements once cash flow allows.
3. Write a simple business plan and check your market
Look at the HVAC companies that come up on Google Maps in your area: how many reviews they have, what they advertise (financing, same-day service, maintenance plans), and which areas they cover well or badly. Decide what makes you different, whether that's faster scheduling, a specific area, honest flat-rate pricing or a specialty like heat pumps or ductless systems.
Demand for the trade is strong: the BLS projects employment of HVAC mechanics and installers to grow 11 percent from 2025 to 2035, much faster than the average for all occupations. The median pay was $61,010 a year in May 2025, a useful benchmark for what you'll pay technicians.
4. Register the business
- Choose a structure. Many owners form an LLC or corporation to separate business and personal liability (it won't protect you from your own negligence on a job); talk to an accountant and an attorney.
- Register with your state, usually through the Secretary of State, and file a DBA if you'll operate under a different name.
- Get a free EIN from the IRS. It's issued immediately online if approved; never pay a website for it.
- Apply for your contractor license in the business name if your state requires one, and get your local business license.
- Open a business bank account and keep every business payment in it.
5. Get insured (and bonded where required)
- General liability insurance: covers property damage and injuries to others. Many states require proof of it for a contractor license, and commercial clients will ask for a certificate.
- Workers' compensation: required by state law in most states once you have employees (rules and exemptions vary by state). You'll also pay state unemployment insurance tax, and a few states require short-term disability coverage.
- Commercial auto: for your service vans and trucks.
- Tools and equipment coverage: for the tools and inventory in your vans.
- Surety bond: some states and cities require a license bond for contractors.
6. Tools, vehicle and inventory
A service van is your office, warehouse and billboard. Plan for:
- Refrigerant tools: manifold gauges or digital probes, recovery machine and recovery cylinders, vacuum pump and micron gauge, leak detector, scale
- Electrical and combustion test instruments: multimeter, clamp meter, combustion analyzer, manometer
- Hand and power tools, ladders, and brazing equipment
- A stocked van: capacitors, contactors, motors, filters, thermostats and common parts, so you fix more on the first visit
- Safety gear, including protection for rooftop and attic work
Plan for A2L refrigerants. Under the EPA's Technology Transitions rule, new residential and light commercial AC and heat pump systems must use refrigerants with a global warming potential (GWP) below 700. Many of the replacements, such as R-454B and R-32, are classified A2L (mildly flammable) and are accepted by the EPA with use conditions for equipment designed for them. Before you buy recovery machines, vacuum pumps and leak detectors, check that they're rated for A2L refrigerants, and get your technicians trained on handling them.
Buying instruments as the jobs require them, rather than all at once, helps cash flow.
7. Set your prices: flat rate vs. time and materials
Many HVAC companies use flat-rate pricing: a set price per task from a price book, regardless of how long it takes. Customers like knowing the price before you start, and efficient technicians are rewarded. Time and materials is simpler to start with but harder to sell, and it punishes you for being fast.
Whichever you choose, build prices up from your costs:
- Overhead per billable hour = total yearly overhead (vehicles, insurance, software, rent, marketing, office help) ÷ the hours you'll actually bill (not the hours you work)
- Price = (overhead per billable hour + labor cost per hour) × hours for the task + materials with markup + profit
New owners most often underprice by forgetting unbilled time: driving, estimates that don't close, callbacks and paperwork. Use written estimates for every replacement and larger repair; our free contractor estimate template and invoice template work until you move to software.
8. Build recurring revenue with maintenance agreements
HVAC is seasonal: phones ring constantly in the first heat wave and the first cold snap, and slow down in spring and fall. Maintenance agreements smooth that out. Customers pay a yearly or monthly fee for a spring cooling tune-up and a fall heating tune-up, plus perks like priority scheduling and a repair discount. You fill the shoulder seasons with scheduled visits, and you become the company they call when something breaks.
Download our free HVAC service agreement template (Word and PDF) to start offering a plan from day one.
9. Get your first customers
- Google Business Profile: set it up as a service-area business, choose the right categories and add real photos. Our Google Business Profile guide for contractors walks through it.
- Reviews: ask after every job; reviews are what homeowners compare first. See how to get more Google reviews.
- A website that turns visits into calls: clear services, service areas, financing options and a phone number on every page. See HVAC website design: what converts.
- Local SEO: pages for your services and the towns you serve. Our local SEO guide for contractors covers HVAC-specific steps.
- Financing: monthly payments help homeowners say yes to replacements; see customer financing programs for contractors.
- Paid leads: Google Local Services Ads charge per lead and can bring calls quickly once you're verified; see what Local Services Ads cost.
- Relationships: real estate agents, home inspectors, property managers and other trades who can send you work.
10. Use software before the paperwork buries you
Scheduling, dispatching, estimates, invoices, maintenance agreement tracking and card payments in one app save hours a week and help you look professional. See our comparison of the best HVAC field service software, and connect it to your bookkeeping (our guide to QuickBooks for contractors covers the setup).
HVAC business startup checklist
| Step | Done |
|---|---|
| EPA Section 608 certification (Universal if you can) | ☐ |
| State or local HVAC/mechanical contractor license, if required | ☐ |
| EPA RRP firm and renovator certification if you'll disturb paint in pre-1978 homes | ☐ |
| A2L-rated recovery machine, vacuum pump and leak detector | ☐ |
| Choose residential service, installation or commercial | ☐ |
| Form your business entity and register a DBA if needed | ☐ |
| Get a free EIN from the IRS | ☐ |
| General liability, workers' comp, commercial auto, bond if required | ☐ |
| Open a business bank account | ☐ |
| Van, tools, test instruments and starting parts inventory | ☐ |
| Price book built from your real overhead and billable hours | ☐ |
| Maintenance agreement offer | ☐ |
| Google Business Profile, website and review requests | ☐ |
| Field service software for scheduling, estimates and invoices | ☐ |
