Key takeaways
- Most HVAC acquisitions stack two or three financing sources — commonly an SBA loan, a seller note, and a short revenue-based layer for gaps — rather than one product.
- SBA 7(a) is the workhorse for HVAC buys under roughly $5M: long amortization protects cash flow, but expect 45–90 days, a ~10% buyer injection, and clean reconcilable books.
- Recurring service-agreement revenue is the most bankable asset in an HVAC company; verify agreement count, renewal rate, and monthly recurring billing, not just top-line revenue.
- Seller financing is common and worth requesting as a subordinated layer — it can fill the equity gap and signals the seller's confidence in the book.
- Revenue-based financing is approved on bank deposits and revenue over credit (FICO 500+), minimum around $10,000, funded in roughly 24–48 hours.
- Revenue-based funding fits deal gaps — closing costs, post-close working capital, fleet/inventory spend, or bridging a delayed close — not the core purchase price.
- Approval is never guaranteed; a revenue-based underwriter reads deposit consistency, average daily balance, and revenue trend, and repayment flexes with ongoing revenue.
What you are actually buying in an HVAC deal
Before you pick a financing path, price what is on the table, because the mix of assets decides which lenders will even look at the deal. An HVAC company is rarely just trucks and tools. The value usually sits in four buckets: recurring maintenance agreements (planned service contracts that renew), the installed base and replacement pipeline (customers whose systems are aging into a change-out), the trained crew and licenses, and the brand and phone number that generate inbound calls.
Underwriters treat these very differently. Recurring service revenue is the single most bankable line item — it is predictable cash flow, and both SBA lenders and revenue-based funders lean on it heavily. A company that is 70% new-construction install and 30% service is far more cyclical and harder to finance than one with a deep book of maintenance agreements. When you request records, ask specifically for the service-agreement count, renewal rate, and monthly recurring billing, not just the top-line revenue. That number is what protects your ability to service acquisition debt in a slow quarter.
The main ways to finance the purchase
Each path is underwritten on a different thing. Match the path to what the business actually has.
- SBA 7(a) acquisition loan. The workhorse for HVAC buys under roughly $5M. Long amortization keeps the monthly payment low, which protects cash flow. Underwritten on the target's historical cash flow (add-back adjusted EBITDA), your industry experience, and typically a 10% buyer equity injection. Slow — 45 to 90 days — and paperwork-heavy. Requires a business valuation and clean books.
- Seller financing. The seller carries a note for part of the price, paid out of the business's future cash flow. Common on HVAC deals because owner-operators want a clean exit but will bridge a gap to close. Also signals the seller believes the book will hold up. Frequently required as a subordinated piece behind an SBA loan.
- Conventional / bank acquisition loan. Faster underwriting than SBA for strong borrowers with collateral, but shorter terms and stricter equity and credit requirements. Best when you already have a banking relationship and hard collateral.
- Investor equity or rollover. An outside partner (or the seller rolling equity) funds part of the buy in exchange for ownership. No monthly debt payment, but you give up upside and control.
- Revenue-based financing (marketplace / MCA). Approval driven by bank deposits and revenue rather than credit score, funding in roughly 24 to 48 hours, minimums around $10,000, FICO 500+. It is not the tool for the whole purchase price. It is the tool for the gaps a deal leaves — closing costs, a seasonal working-capital cushion, an inventory or fleet spend right after takeover, or bridging a delayed SBA close so you don't lose the deal.
How each path gets approved (the underwriter's lens)
Buyers waste months applying to the wrong path. Here is what actually decides each yes or no.
- SBA: Does the target's adjusted cash flow cover the proposed debt service with room to spare (a debt-service-coverage ratio comfortably above 1.15–1.25x)? Do you have relevant operating or trade experience? Is there a 10% injection, and can seller financing fill part of it? Are the last three years of tax returns clean and reconcilable to the P&L?
- Seller note: Is the price defensible, and is the seller willing to subordinate and stay on for a transition? Sellers finance deals they believe in.
- Conventional bank: Personal credit, collateral coverage, and existing relationship. Weakest on cash-flow-only deals with thin collateral.
- Revenue-based funding: The underwriter reads the business's bank statements — deposit consistency, average daily balance, and monthly revenue trend. Personal credit matters far less; a 500+ FICO can still get a yes. Because it is cash-flow underwriting, it moves in hours, not weeks. It is priced for speed, so it belongs on short-duration needs, not on the core acquisition.
For the mechanics of how revenue and deposit-based approvals work, see our pillar guide to revenue-based business financing, and the deeper walkthrough of business acquisition financing.
Decision framework: which path fits your deal
Use the target's own numbers to choose, not a preference for one product.
An SBA acquisition loan works best when the company has three years of clean, reconcilable books, real add-back-adjusted cash flow, a meaningful service-agreement base, and you can wait 45–90 days and put 10% in. Avoid SBA when the books are messy, the seller needs to close in weeks, or the deal is small enough that the paperwork burden outweighs the benefit.
Seller financing works best when the owner is retiring, wants a clean handoff, and will stay for a transition — and it is nearly always worth requesting as a subordinated layer. Avoid leaning on it when the seller wants full cash at close or the price is inflated (a seller who won't carry any note is telling you something).
Revenue-based financing works best when the acquired company already has steady deposits, and you need speed — closing-cost gap, a post-close working-capital cushion, a fleet or inventory push, or bridging a delayed bank close so the deal doesn't die. Minimum around $10,000, FICO 500+, funded in 24–48 hours, repaid as a share of ongoing revenue so it flexes with your slow and busy months. Avoid using it to fund the core purchase price, to prop up a business with declining or erratic deposits, or when a cheaper, slower option comfortably fits your timeline. Nothing here is guaranteed — approval always depends on the deposits and revenue the underwriter sees.
Example acquisition structures (for illustration)
These are illustrative structures, not quotes, to show how the paths stack. Figures are labeled for example only.
| Deal profile (for example) | Core financing | Gap / speed layer | Why it fits |
|---|---|---|---|
| Established service-heavy HVAC co., clean books, retiring owner | SBA 7(a), ~10% buyer injection | Seller note as part of the injection; small revenue-based cushion post-close | Low monthly payment protects cash flow; seller note bridges equity gap |
| Smaller company, mixed install/service, seller wants a fast exit | Seller financing for a large share of price | Revenue-based funding for closing costs + first-season working capital | Speed and simplicity; deposits support a short cash-flow layer |
| Solid deposits but messy tax records, SBA close slipping | Bank/SBA in progress | Revenue-based bridge funded in 24–48h | Keeps the deal alive without losing the seller to another buyer |
| Buyer with a partner, wants no personal debt | Investor/rollover equity | Revenue-based funding for a fleet or inventory push at takeover | Preserves liquidity while ramping the acquired book |
Repayment on the revenue-based layer is structured as a portion of ongoing revenue, so it rises and falls with your billing rather than a fixed calendar payment — useful across HVAC's seasonal swing between peak cooling/heating demand and shoulder months.
Due diligence that protects your financing
The same diligence that keeps you from overpaying is what keeps your financing intact. Pull and verify: three years of tax returns reconciled to P&Ls and to bank deposits; the service-agreement schedule with renewal rates; a customer concentration breakdown (one builder at 40% of revenue is a risk every lender will flag); the fleet age and condition; technician licenses, and whether key techs and the owner's book of relationships transfer; open warranty obligations and callback rates; and any pending permits or liens.
Two HVAC-specific traps: owner-dependent revenue, where the calls come because customers trust the retiring owner personally, and deferred fleet and equipment replacement, where the trucks and diagnostic tools are one season from a large spend the seller quietly avoided. Both change what you should pay and how much working-capital cushion to arrange at close. A revenue-based cushion is often exactly how buyers cover that first fleet or tooling spend without draining the account down to nothing.
A practical order of operations
Run the buy in this sequence. First, get a letter of intent and request the financial package — returns, P&Ls, bank statements, and the service-agreement schedule. Second, reconcile the deposits to the books; the bank statements are the truth. Third, size the core financing (SBA, bank, or seller note) against the verified cash flow and confirm it clears debt-service coverage. Fourth, ask the seller to carry a subordinated note — it fills the equity gap and de-risks the deal. Fifth, identify the gaps the core financing leaves: closing costs, transition working capital, and any immediate fleet or inventory spend. Sixth, arrange a revenue-based layer only for those short-duration gaps, sized to the acquired company's deposits, so you keep liquidity through the first season. Line the pieces up before you close, not after — a buyer scrambling for working capital in week three has less leverage and fewer options.
Frequently asked questions
What is the most common way to finance buying an HVAC company?
An SBA 7(a) acquisition loan is the most common core financing for HVAC buys under about $5M, because its long amortization keeps the monthly payment low and protects cash flow. It is usually combined with a seller note to help meet the equity requirement, and sometimes a short revenue-based layer to cover closing costs and post-close working capital.
Can I buy an HVAC business with no money down?
True zero-down is rare and usually not advisable. SBA lenders typically require around a 10% buyer injection, though a portion can sometimes come from a subordinated seller note. Structuring a deal with seller financing plus a working-capital layer can reduce the cash you bring to closing, but expect to have some equity and some liquidity in reserve.
Where does revenue-based financing fit in an acquisition?
On the gaps, not the core price. Use it for closing costs, a first-season working-capital cushion, an immediate fleet or inventory spend after takeover, or to bridge a delayed bank or SBA close so you don't lose the deal. It funds in roughly 24–48 hours and is underwritten on the business's deposits, which makes it a speed tool rather than a long-term acquisition loan.
What credit score do I need to finance an HVAC purchase?
It depends on the path. SBA and conventional bank loans weigh personal credit heavily and generally want stronger scores. Revenue-based financing is approved primarily on business bank deposits and revenue and can work with a FICO of 500 or higher, because the underwriter is reading cash flow rather than credit alone.
How long does it take to close on an HVAC company?
An SBA-backed acquisition typically runs 45 to 90 days once diligence is underway. Conventional bank loans can be faster for strong borrowers with collateral. Revenue-based funding for gap needs can be approved in about 24 to 48 hours, which is why buyers use it to keep a deal alive when a slower loan is running behind the seller's timeline.
What should I look at most closely in the target's numbers?
Reconcile three years of tax returns to the P&Ls and to actual bank deposits, then examine the service-agreement schedule and renewal rate, customer concentration, and fleet age. Recurring service revenue is what supports acquisition debt through slow months, and deferred fleet replacement is a hidden cost that changes both your price and your working-capital plan.
Is repayment on revenue-based financing a fixed monthly payment?
No. It is structured as a portion of ongoing revenue, so it rises when billing is strong and eases in slower months. That flexibility matters in HVAC, where cash flow swings between peak cooling and heating demand and quieter shoulder seasons. It is priced for speed, so it belongs on short-duration needs.
Should I use one financing source or combine several?
Most well-structured HVAC acquisitions combine sources. A typical stack is an SBA or bank loan for the core price, a subordinated seller note to fill the equity gap and de-risk the deal, and a small revenue-based layer for closing costs and transition working capital. Line all the pieces up before closing so you keep liquidity through the first season.
