Wrenmoor Funding, a small-business funding service in Chattanooga, TN, walks Hamilton County, TN HVAC and plumbing contractors through the working capital gap: parts and units bought ahead, technician payroll every week, and install jobs paid on terms. The article maps the gap, then matches each piece to a funding option.
A Trade With a Real Payroll
Hamilton County, TN had 125 plumbing, heating and air-conditioning contractors with employees in 2023, employing 2,101 people with $144.0 million of annual payroll (County Business Patterns 2023 from the U.S. Census Bureau; NAICS 238220). Only 40.8% had fewer than five employees, and 13 of them had an address in ZIP 37406 (ZBP 2023).
In other words, this is a trade where the weekly wage bill is the first thing that goes wrong when customer payments slow.
Map the Gap Before Choosing Funding
- List the next eight weeks of payroll, by week
- List parts and equipment orders and their supplier due dates
- List expected customer payments: service tickets, install deposits, final payments after inspection
- Mark the weeks where outgoing exceeds incoming
The marked weeks are the working capital need. If they cluster around one large job, it is a one-time gap; if they show up every month, it is a recurring one.
A Worked Install Gap (Illustrative Only)
A sample shop wins three replacement installs worth $41,000 in total, with 30% deposits and the balance due after inspection. Units and materials cost $22,500, payable to the supplier in 15 days. Two technicians' wages for the install weeks come to $8,800. Deposits bring in $12,300, so the shop is $19,000 short until final payments arrive. All numbers are invented for the arithmetic.
Which Option Fits Which Piece
- A one-time gap like the example above: working capital, repaid when the final payments arrive
- Gaps that recur every month: a business line of credit, drawn and paid down repeatedly
- A new van or recovery machine: equipment financing, kept separate from the payroll gap
The plumbing and HVAC industry page has more on vans, parts and service agreements.
What Partners Will Ask an HVAC Shop
- Recent bank statements
- The jobs behind the gap: contracts, deposits, inspection dates
- Supplier terms
- Service agreement billing, if any
- Existing equipment payments
Service Agreements as a Cash Cushion
Maintenance agreements billed monthly or annually bring in steady deposits that do not depend on winning new installs. A shop building its agreement base is also building the kind of predictable revenue partners read favorably, and it narrows the install-driven gap described above. Track active agreements, renewal rates and billing dates in one list.
Plumbing Contractors Carry a Different Gap
Plumbing shops often collect faster on service calls, because a leak repair is paid at the door. Their slower money sits in new-construction rough-ins billed by pay application and in stocked water heaters, fittings and fixtures waiting on the next job. Working capital for plumbing contractors is therefore more often about the parts room and the pay-app lag than about a single install.
Shops that do both service and new construction should map the two loops separately before deciding how much to ask for.
Tools That Belong in an Equipment Request
Recovery machines, vacuum pumps, press tools, jetters and a second van last for years. Paying for them out of working capital drains the cash meant for parts and payroll. Equipment financing spreads a long-lived tool over its working life and leaves the cash cushion alone.
Shop Payroll by the County Numbers
Hamilton County, TN plumbing, heating and air-conditioning contractors with employees paid $144.0 million in wages in 2023 across 2,101 employees, about $68,534 per employee by our arithmetic (CBP 2023, NAICS 238220). 13 of those employer shops were in ZIP 37406 (ZIP Business Patterns 2023). A payroll that size is why a single slow install can matter.
Three Habits That Shrink the Gap
- Collect larger deposits on installs where customers accept them
- Invoice the final payment the day the inspection passes
- Ask the supplier about terms that match your install schedule
Local figures for other trades are on the Chattanooga, TN page. Further Wrenmoor reading sits on the blog.
By Wrenmoor Funding · Updated
