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Running an HVAC business in Texas means you already know the drill. Summer is full tilt. Phones ring before you finish coffee. Trucks run double shifts. Revenue piles up fast. Then September comes, the calls slow down, and the bank account tells a very different story.
The cash flow problem most HVAC owners face isn’t that business is bad. It’s that all the good months happen at once, and the slow months still have the same payroll, insurance, loan payments, and truck maintenance on the calendar. Planning for cash flow swings in the HVAC business is the difference between a shop that scales and one that scrambles every fall.
Residential HVAC revenue in Texas clusters heavily into two windows: summer cooling season (May through August) and the heating spike in November and December. The shoulder months, September, October, March, and April, are where cash gets thin.
According to industry benchmarks from the Air Conditioning Contractors of America (ACCA), residential HVAC contractors commonly see 40% to 60% of their annual revenue land in the summer cooling window alone. That concentration is normal, but it creates real planning problems if you’re spending summer money as fast as it comes in.
The shops that handle the swing well do one thing consistently: they treat the slow months as a fixed cost of doing business, not a surprise. They budget for them in July, not in October when the balance is already low.
A standard benchmark for service businesses is three to six months of fixed operating expenses held in reserve. For an HVAC company running $1.5M in annual revenue with $80,000 to $100,000 in monthly fixed costs (payroll, insurance, vehicle payments, facility, utilities), that means keeping $240,000 to $600,000 accessible during the slow season, depending on how lean or conservative you want to run.
Most HVAC owners we work with don’t hit the six-month mark, and they don’t need to. A realistic goal for a two-to-four truck shop is three months of fixed expenses, parked in a business savings or money market account you don’t touch for day-to-day operations. The goal isn’t to hoard cash. It’s to cover October, November, and early December without running payroll off a credit card.
If you’re still working out what the right reserve number looks like for your specific shop size, it helps to think through the decision deliberately. This breakdown of how much cash to keep in your business walks through the logic behind the benchmark ranges so you can set a target that actually fits your overhead.
If your current reserve is less than one month of fixed costs, that’s the first thing to fix before any other financial strategy conversation happens.
The best time to build a shoulder-season budget is August, when cash is still flowing, and you have real numbers to work from. Waiting until October means you’re already in the thin part of the year and reacting instead of planning.
A simple slow-season budget for an HVAC shop covers four things: fixed payroll, vehicle and equipment payments, insurance premiums, and a minimum marketing spend to keep maintenance agreement calls coming in. Add those up across October through February, and you have your floor. Anything you’re sitting on above that floor at the end of August is working capital you can either hold or deploy strategically.
Maintenance agreement revenue is one of the most underused cash flow levers in this industry. An HVAC shop with 300 active maintenance agreements at $200 per year is generating $60,000 in predictable recurring revenue that doesn’t care what the weather does. If you haven’t structured your maintenance program to front-load that cash, it’s worth building.
Payroll is the highest fixed cost most HVAC owners carry, and it’s the one that causes the most panic in slow months. There are a few practical approaches depending on how your team is structured.
If you’re running a mix of full-time and part-time or seasonal technicians, the shoulder season is the right time to shift seasonal staff to reduced hours rather than laying off and rehiring. Recruiting and training a new tech costs more than carrying a reduced-hours tech through a slow quarter, especially in the current labor market.
For full-time crews, the shoulder months are also the best time to schedule non-emergency installs, ductwork jobs, and commercial preventative maintenance that gets delayed all summer. Front-loading that backlog into October and November keeps revenue moving and keeps techs on the clock without relying on weather-driven service calls.
The payroll tax math matters here too. If you’re running an S-corp, your owner salary obligations don’t slow down just because revenue does. Working with your accountant on Fort Worth HVAC accounting in July or August means the salary and distribution split is set before the slow season hits, not adjusted in a panic.
If you’re not sure whether your current CPA is the right fit for a trade business, it helps to know what to look for before you commit. These questions to ask before hiring a CPA can help you tell the difference between someone who does tax prep and someone who actually plans ahead with you.
Most HVAC shops buy their biggest equipment and vehicles during or just after peak season. A replacement truck, a new diagnostic system, or a fleet of recovery units are often purchased in late summer when cash is available. The timing of that purchase has a direct effect on your year-end tax position.
Under Section 179 of the Internal Revenue Code, business equipment placed in service during the tax year can be expensed immediately rather than depreciated over time. The 2026 Section 179 deduction limit is $2,560,000 for tax years beginning in 2026, per IRS Publication 946, with a phase-out beginning at $4,090,000 in total equipment placed in service. Bonus depreciation is back to 100% for property acquired and placed in service after January 19, 2025, so the phase-down you may have read about no longer applies.
Let’s look at an example. An HVAC owner buys two service trucks in September for $80,000 total. Using Section 179, they can deduct the full $80,000 in the current tax year, which reduces taxable income significantly heading into the slow season when cash is tighter. The purchase timing relative to your fiscal year matters, so coordinate with your accountant before signing a purchase order.
A business line of credit is a reasonable tool for short-term cash flow gaps, with one important condition: it should bridge predictable seasonal troughs, not cover ongoing losses or underfunded operating budgets.
A $50,000 to $150,000 revolving line of credit is a common setup for mid-size HVAC shops. You draw it down in October and November when payroll outpaces service call revenue, then pay it back in May and June when summer cash comes in. Used that way, it’s cheap short-term capital and it keeps you from tapping your reserve for predictable gaps.
Where lines of credit go wrong is when they become permanent debt. If you’re carrying a balance year-round that never fully pays down, the line is covering a structural problem (underfunded overhead, margin erosion, or pricing that doesn’t cover costs), not a seasonal one. That’s a different conversation than cash flow smoothing.
Banks and credit unions typically want two years of business tax returns, a clean business checking history, and a debt-service coverage ratio above 1.25 to approve a line for a trade contractor. Getting your books in order before you need the line is a much easier conversation than cleaning them up under pressure.
Cash flow planning only works if your numbers are current. Most HVAC owners we talk to are operating with books that are two to four months behind, which means they don’t know their actual cash position, their gross margin by service type, or whether the slow season is going to be mild or painful until it’s already happening.
Monthly reconciliation, keeping your business checking and credit cards reconciled through the prior month, is the baseline. From there, a monthly profit and loss report tells you whether your labor cost percentage is in range (typically 25% to 35% of revenue for residential HVAC, per ACCA benchmarks), what your gross margin on equipment installs looks like versus service calls, and where slow-season spending is running ahead of budget.
Fort Worth bookkeeping done monthly means you see the warning signs in August, not in October when options narrow. The data is only useful if it’s current.
There’s a meaningful difference between a tax preparer and a year-round accountant. A tax preparer works with last year’s numbers and fills out forms. A year-round accountant helps you set up the budget, model the slow-season cash position, time equipment purchases for maximum tax efficiency, and flag problems before they become emergencies.
For HVAC owners specifically, the questions that matter most, S-corp election, owner salary versus distributions, bonus depreciation timing, quarterly estimated tax accuracy, don’t have useful answers in April. They need to be worked out in July and August when there’s still time to change the outcome.
If your current CPA only hears from you at tax time, you’re paying for compliance and getting nothing for planning. Depending on your situation, switching to a year-round model often pays for itself in the first year through better tax timing alone.
Use our S-corp tax calculator to see whether your current setup is costing you in self-employment taxes.
Cash flow in an HVAC business is predictable enough to plan for. The shop owners who get ahead of it are the ones who treat August like a planning month, not just a revenue month.
If you want to build a cash flow plan before the slow season hits, reach out to us at https://adamtraywick.com/get-in-touch/
Adam Traywick, CPA is the President and founding CPA of Adam Traywick, LLC, a Adam Traywick CPA small-business accounting firm. He has over 20 years of experience helping small business owners across home-services trades, hair salons, real estate, and insurance agencies optimize taxes, run cleaner books, and avoid the surprises that come from once-a-year accountants.
