Why HVAC Contractors Make Millions and Still Struggle to Pay the Bills
You booked a packed July. You worked until two in the morning. And you still opened your banking app wondering how you’d cover the mortgage.
That gap between busy and profitable is what this episode is about. Sarah Gonzales sits down with Austin Wendel, founder of Accounting for Trades, a bookkeeping firm that works with HVAC, plumbing, and electrical owners and nobody else. No MBA jargon. What to track, when to hire, and how to keep more of what you earn.

Accounting for TradesAbout the guest. Austin Wendel founded Accounting for Trades, a bookkeeping firm working only with HVAC, plumbing, and electrical business owners. His focus is operational accounting, which means helping owners know their numbers well enough to make decisions with them.
What You’ll Learn in This Episode
- 01The one number every owner should know. Gross profit by job tells you which work makes money and which quietly loses it.
- 02How to work it out on a $10,000 install. Austin walks through it in plain numbers, step by step.
- 03What a healthy margin looks like on install, on service, and on maintenance. They’re not the same.
- 04Where growing shops bleed money. Overhead creep is the silent killer between $1M and $2M.
- 05Your survival number before going solo, and how many months of runway keeps a new business breathing.
- 06Why whoever answers your phones is your sales team, and how to tell if they’re costing you jobs.
Austin put together two free guides that go deeper than we had time for in the episode. Grab both below.
Free Resources From This Episode
- Managing the Books at Every Stage
The two numbers to watch from $200K to $5M, plus the exact system to run at each stage: banking, job costing, software, and hiring. If you have ever felt like you cannot see your own business anymore, start here.
- The Solo HVAC Contractor Financial Checklist
A 22-point checklist for anyone getting ready to go out on their own, covering runway, insurance, pricing, and the hires to make first. From the bench to the business, this is what no one tells you before you go solo.
When Should an HVAC Contractor Hire a Bookkeeper?
You should be using accounting software from day one, before you go solo. It handles invoicing and scheduling, keeps the numbers in one place, and gives your accountant something clean to check instead of a shoebox.
The bookkeeper matters later, and the trigger is hiring. Once there’s a crew, a fractional bookkeeper who only bills for time spent on your books keeps things tidy enough that you can make good decisions. The alternative is running a business you can’t see inside.
Austin’s blunt version: you’d hate to run even a small company that isn’t profitable. The moment the paperwork outgrows you is the moment to bring in help.
Know the number before the busy season, not after it.
Watch the Gross Profit BreakdownHow Do HVAC Contractors Get Glowing Reviews, Not Just Five Stars?
The game has shifted. Homeowners no longer search for the best HVAC company near them and pick from a list. AI tools and detailed reviews now match each homeowner to the contractor who fits their situation, so a review that tells a story is worth more than a bare five stars.
Austin’s method is the lowest-tech one there is, and almost nobody runs it properly:
- Do an excellent job first. No mud on the carpet, kind to the kids and the dog. That’s the baseline, not the strategy.
- Have the tech ask in person, at the end. Short and sincere: we’re locally owned, we grow on reviews from people like you, and here’s $20 off today as thanks for your time.
- Make it happen right then. Hand over the QR code on the spot, because "I’ll do it tonight" is where reviews go to die.
- Reward the tech. A $20 gift card back at the office for every review earned. A good tech can make a few hundred extra a month, and the culture follows the incentive.
That story-rich review is what makes a homeowner think that’s the company for me. It’s the same reason reviews and reputation are a core part of what RS Gonzales manages for HVAC clients.
You’ve got a number you wish somebody had told you about sooner. Say it out loud.
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