From HVAC Tech to Shop Owner: Runway, Timing, and Your First 90 Days

Going from HVAC tech to shop owner: how much runway to save (worked example), when to quit vs. moonlight, your employer agreement, license timing, and first-90-day cash.

The paycheck stops before the business can replace it. That gap is what this page is about: how much money you need to cross it, when to jump, what to check with your current employer before you do, how long the license takes, and how to watch cash in the first 90 days so you know early if the plan is working.

The business setup itself (entity, insurance types, startup cost categories, pricing, first customers, first hire) is in our How to Start an HVAC Business playbook. Read that for the "what to set up" list. This page is the "how to get yourself across" part.

This is general information, not legal, tax, or insurance advice. Licensing, employment, and tax rules vary by state and by your own situation. Talk to an accountant and an employment attorney before you commit, and check with your state licensing board.

Step 1: Know the full number you're replacing

Your paycheck is only part of what your job pays you. When you leave, you also lose things your employer was covering, and you pick up taxes an employee never sees:

• Self-employment tax. The IRS self-employment tax rate is 15.3% (12.4% Social Security plus 2.9% Medicare), and it applies once your net self-employment earnings reach $400 or more. As an employee, your employer paid half of that for you. Source: IRS, "Self-employment tax (Social Security and Medicare taxes)"
• Estimated taxes. No one withholds for you anymore. The IRS says sole proprietors, partners, and S corporation shareholders generally must make estimated tax payments if they expect to owe $1,000 or more, and underpaying by each due date can bring a penalty "even if you are due a refund." Source: IRS, "Estimated taxes"
• Health insurance. If your employer has 20 or more employees, COBRA may let you keep your group plan for a limited time, but you "may be required to pay the entire premium for coverage up to 102% of the cost to the plan." Source: U.S. Department of Labor, COBRA overview HealthCare.gov says you have 60 days after losing job-based coverage to enroll in a Marketplace plan. Source: HealthCare.gov, COBRA coverage page Get a real quote for both before you set a quit date. It's often one of the biggest new lines in your household budget.
• Everything else the shop provided: the truck, fuel card, phone, tools, uniforms, paid time off, and any retirement match.

For what techs earn in your state (roughly what you're giving up), see HVAC technician pay by state. For what public data shows about owner income, see How much do HVAC business owners make?. The free HVAC revenue goal calculator works backward from the income you want to the revenue and jobs it would take.

Step 2: Do the runway math (worked example)

We don't have a sourced figure for how many months of runway is "enough." It depends on your household, your market's seasons, and whether you build the business on the side first. What you can do is work out your own number instead of guessing. The SBA's startup-cost guidance says to count "at least one year of monthly expenses" when you plan. Source: SBA, "Calculate your startup costs"

The formula:

Runway needed = (monthly household cost + monthly business fixed cost) x months until the business can pay you + parts float + a buffer for surprises

One-time startup costs (license, tools, truck, entity filing) are a separate pile of money. Price those with the startup cost table in the start-a-business playbook and don't count the same dollars twice.

Worked example. The household and several business numbers below are made up for illustration; the rows marked "sourced" use published medians or list prices. Replace every number with your own.

Insurance sources: Insureon's figures are "the median cost of policies for HVAC installation companies that apply for quotes with Insureon," most of them with fewer than five employees. Source: Insureon, "HVAC contractor insurance cost" Software: Housecall Pro pricing page lists Basic at $79 a month billed monthly ($59 billed annually). Your own quotes will differ by state, driving record, and coverage limits.

Now the runway, assuming (hypothetically) it takes 6 months before the business can reliably pay your household:

Two things this example shows:

• Months-to-pay is the biggest lever. If the same owner's business could pay them after 4 months instead of 6, the runway drops to about $35,800 (($5,650 + $1,377) x 4 + $3,000, plus 15%). That's why when you start matters (Step 3).
• Your household number matters more than your business number. In this example the household is about 80% of the monthly burn. Cutting household spending by $500 a month before you quit is worth about $3,450 of runway over 6 months, with the buffer.

Keep the tax money out of the runway. Money you set aside for self-employment and income tax isn't runway; it's already spent. Ask your accountant what percentage of each payment to move into a separate tax account.

Step 3: Quit, or build it on the side first?

There's no single right answer, but the runway math usually points one way.

Starting on the side keeps your paycheck and benefits, tests whether people call you, and builds savings. Continuing the hypothetical example: an owner who starts with $20,000 saved, puts away $800 a month from the paycheck, and banks $1,200 a month of side-job profit (after parts and tax set-aside) would have $44,000 after 12 months. That's still short of the $52,000 target, so they either keep going a few more months, cut household costs, or plan a busy-season start that needs less runway. The limits are real: fewer hours, burnout, and no way to take the 10 a.m. Tuesday emergency call. Side work also still needs the license, insurance, and permits your area requires.

Going all in gives you full days to sell and work, and you grow faster if the demand is there. The cost: no paycheck, so the runway has to be real, and there's pressure to take any job at any price.

Timing the jump. Starting at the front of your busy season (cooling or heating, depending on your climate) means your first months bring cash in instead of eating it, which is the "months-to-pay" lever from Step 2. Starting right before a shoulder season does the opposite.

Step 4: Check your employer agreement before you do anything

Read everything you signed when you were hired: offer letter, employment agreement, handbook acknowledgment. Look for four things:

1. Non-compete: limits on working in the trade in an area for a period after you leave.
2. Non-solicitation: limits on contacting the company's customers or recruiting its employees.
3. Confidentiality: customer lists, pricing, and price books usually belong to the employer.
4. Outside-work or moonlighting policy: some employers bar side jobs in the same trade.

Where the law stands, in general terms:

• There is no federal noncompete ban. On September 5, 2025, the FTC moved to dismiss its appeals and "accede to the vacatur" of its Non-Compete Clause Rule, which a Texas federal court had set aside in 2024. Source: FTC press release, September 5, 2025
• State law decides most of it. A July 2026 overview from the law firm Foley & Lardner lists California, Minnesota, North Dakota, Oklahoma, and Wyoming as states where employee noncompetes are broadly void (with limited exceptions), and states such as Colorado, Illinois, and Oregon that bar them below income thresholds. It also notes that non-solicitation and confidentiality obligations may still be enforceable even where noncompetes are restricted. Source: Foley & Lardner, "Noncompete Agreements in 2026: A Federal and State Overview"

What that means in practice (not legal advice; have an employment attorney read your actual agreement):

• Don't take customer lists, price books, or photos of the dispatch board when you leave.
• Don't use the company's truck, parts, tools, or time for side work.
• If a former customer finds you on their own, check your non-solicitation terms before you take the job.
• Leave on good terms. In many states your license application needs documented experience, often verified by a licensed contractor you worked under. That may be your current employer.

Step 5: Put the license on your timeline, not after it

The license is often the longest item on the path, so plan backward from it.

EPA Section 608. You need your own card once you're no longer working under a certified tech. Certifications don't expire, and the core section must be proctored if you want Universal. The playbook covers the four types. Source: EPA, "Section 608 Technician Certification Requirements"

State or local contractor license. An example of how long the experience requirement can be: Texas requires 48 months of practical experience under a licensed air conditioning and refrigeration contractor within the past 72 months (or 36 months plus a 12-month technician certification). After TDLR approves eligibility you take the exam, and everything, including the exam, must be done within one year of filing. The application fee is $115, and there are minimum insurance amounts by license class. Source: TDLR, "Apply for an Air Conditioning and Refrigeration Contractor License" Other states differ a lot. Our HVAC contractor license requirements by state guide links each state's official source.

A backward timeline (the durations are hypothetical placeholders; fill in your state's real ones):

Step 6: Manage cash in the first 90 days

The first 90 days are where the runway either holds or leaks. Five habits:

1. Pay yourself a fixed draw, set to your household number, on the same day every month. If you just take what's left, you can't tell whether the business is working.
2. Move tax money out on every payment, into a separate account, and pay estimated taxes on the IRS schedule.
3. Collect at completion. Residential customers should pay when the job is done. Every unpaid invoice is runway you're lending out. Our cash flow and getting paid guide covers deposits, terms, and a 13-week forecast.
4. Ask your supply house about terms. Paying for parts after the customer pays you shrinks the parts float.
5. Check the cash change every week, not just the bank balance.

Hypothetical first 90 days, continuing the example (all numbers made up):

The number to watch isn't the balance. It's the net change line shrinking toward zero. In this example the business is close to paying for itself by month 3, well inside the runway. If your net change isn't shrinking by month 3, find out why (not enough calls, too-low prices, or unpaid invoices) while you still have most of the runway.

Set a tripwire before you start (our suggestion, not a sourced rule): pick a cash level, for example three months of personal plus business costs, and decide in advance what you'll do if you hit it: cut the draw, take part-time work, or change the plan. Deciding now, while you're calm, beats deciding in a bad month.

The free HVAC cash flow reserve calculator and startup cost and first-year cash calculator let you run this with your own numbers.

Step 7: Close the skills gap while you still have a paycheck

A shop owner does four jobs a tech usually doesn't: sells, prices, keeps the books, and manages people. Start on your weakest one before you quit.

Once you're open, the playbook covers pricing, first customers, and your first hire, and the HVAC KPIs guide covers the numbers to track.

Transition mistakes to avoid

• Quitting before the license is in hand, then waiting months with no legal way to work.
• Leaving health insurance for later. Get the COBRA and Marketplace quotes before you pick a date.
• Spending the tax money. It looks like cash in the account until the quarterly payment is due.
• Counting startup costs as runway. The truck and tools come out of a separate pile.
• Starting right before the slow season, which stretches months-to-pay.
• Burning the bridge. The employer you leave may be the one who verifies your experience.
• Moonlighting against your agreement. Read it first.

Checklist

• Full replacement number worked out, including self-employment tax and health insurance quotes
• Runway calculated with your own numbers, separate from one-time startup costs
• Quit-vs-moonlight decision made against the runway, not a feeling
• Employment agreement read, and reviewed by an attorney if it has restrictions
• License requirements confirmed in writing, with a backward timeline
• Start date set for the front of your busy season
• Fixed owner draw, a separate tax account, and a weekly cash check
• A tripwire cash level and what you'll do if you hit it

For more worksheets and calculators, see the Growth Room toolkit.

Ask owners who made the jump

If you're working out your own runway or quit date, owners who already made the jump are in the Growth Room Discord.