The Cash Year and the Calendar Year
Your income statement runs on the calendar year. Your cash runs on a different calendar, and the two don't line up. That mismatch, more than thin margins or slow months on their own, is what puts otherwise healthy HVAC contractors in a bind every fall.
Start with the shape of the year. Demand in this trade is weather, and weather is seasonal. Across most of the country the slow stretch runs from September into March, the shoulder season that trade groups like ACCA have been warning members about for years. Cooling calls fade in September, heating calls haven't started, and for a few weeks the phone goes quiet while the payroll does not.
The gap between buying the box and getting paid
Now layer on how replacement work actually pays. A residential system runs somewhere between $5,000 and $15,000 installed, and the equipment is a large share of that before your tech turns a screw. A commercial rooftop unit can land between $30,000 and $80,000. You buy the box first. The distributor wants paying on their terms, the job takes days or weeks, and on commercial work the customer pays you net 30 or net 60 after that. So you've covered the equipment, the refrigerant, and the labor out of your own pocket, and you wait a month or two to see the money come back.
That gap got wider in 2025. The industry finished its switch to R-454B refrigerant, which by trade-press accounts runs something like $17 to $20 a pound against $5 to $7 for the R-410A it replaced, and new equipment prices rose an estimated 8 to 10 percent with the changeover. Every replacement job now ties up more cash up front than the same job did 2 years ago, and it does so at exactly the size of job that used to be your bread and butter.
I've watched an owner turn down a good October replacement because the deposit wouldn't cover the equipment and he couldn't float the balance into spring. He had the crew, the customer wanted to buy, and he passed, because saying yes meant carrying $12,000 of someone else's system through his slowest quarter. That's not a profit problem. On paper the job was profitable. It's a timing problem, and timing problems are what sink businesses that look fine in the annual numbers.
What the financing terms are really doing
Equipment financing looks like the fix, and it helps, but read what it does to the size of the work you can take. Term financing typically stretches repayment over 24 to 84 months. That sets a monthly number you carry, and that number quietly caps how many big jobs you can have in flight at once. Every unit you finance for a customer, every install you float on your own line, draws down the same pool. Run out of room and you're turning away work in your busiest weeks, which is the most expensive time to say no.
Holding your crew through the shoulder makes this harder and more necessary at the same time. You can't let skilled techs go in November. The trade doesn't have the people to hire them back, with the median technician wage above $60,000 and rising, and hundreds of thousands of trade positions sitting unfilled. So payroll is close to fixed while revenue swings hard by season. Fixed cost, variable income, and a working-capital draw that peaks right when collections slow. That's the machine you're actually running.
None of this gets solved by working harder in the summer. It gets solved by managing the cash year as deliberately as you manage the jobs.
Build a rolling 13-week cash forecast and update it every Friday. Not a budget, a forecast of actual dollars in and out by week, so you see the September trough coming in July while you can still do something about it. Set deposit terms that cover equipment before you order it, so no single replacement drains the account waiting on net 60. Line up your financing capacity in the spring when the bank likes your numbers, not in the fall when you're already stretched. And price the maintenance base up on purpose, because contracted service revenue is the one line that keeps coming in during the exact weeks everything else goes quiet. Getting through the shoulder every year is less about a strong summer than about seeing the winter coming and funding it in advance.