Broker fees are the single biggest financial surprise in an HVAC business sale — and most owners don't ask until they're already emotionally committed to a process. By then, you're negotiating from weakness. Understanding the fee structures upfront gives you the information you need to compare advisors objectively, ask the right questions, and push back where the market actually supports it.
This guide covers every fee model you'll encounter when hiring sell-side representation for an HVAC business sale — from the simple commission structure a local broker vs. M&A advisor comparison to the Lehman formula used in mid-market transactions. You won't find vague ranges here — these are the numbers that actually appear in engagement letters.
The Three Fee Models You'll Encounter
There are three fee structures in the HVAC M&A market. Which one you face depends primarily on deal size and the type of advisor you engage.
Fee Structure Overview
Success fee (commission)
A percentage of the final sale price, paid at close. No upfront cost. The industry standard for business brokers and the most common structure on deals under $5M. Commission rates range from 6%–12% depending on deal size.
Retainer + success fee
An upfront monthly fee (usually $2,000–$5,000/month) paid during the engagement period, plus a reduced success fee at close. Common with M&A advisors on larger deals — the retainer funds the process work (CIM preparation, buyer outreach) while the success fee aligns the advisor's incentive with your outcome.
Lehman formula variants
Tiered fee structures where the commission percentage is higher on lower tranches of deal value and lower on higher tranches. A common variant: 5% on the first $1M, 4% on the second $1M, 3% on the third, 2% on the fourth, 1% on anything above. Seen in mid-market M&A transactions above $10M.
Success Fee Ranges by Deal Size
Commission rates are not fixed — they compress as deal size increases because the dollar value of a percentage point grows dramatically. Here are the ranges you'll actually encounter in the market:
| Deal Size | Typical Broker Commission |
|---|---|
| Under $1M | 10%–12% |
| $1M–$3M | 8%–10% |
| $3M–$7M | 6%–8% |
| $7M–$15M | 4%–6% |
| $15M+ | 2%–4% (often Lehman formula) |
Most HVAC deals transact between $1M–$10M, so expect to pay 5%–9% all-in on a typical sale.
On a $3M deal at 8%, that's $240,000 at close. On a $7M deal at 6%, it's $420,000. These are real numbers — and they're the reason it's worth having a clear fee conversation before you sign an engagement letter.
What's Included in the Broker Fee
A broker's success fee covers a defined scope of services. On a well-run engagement, those services include:
- 1
Business valuation and CIM preparation
The confidential information memorandum (CIM) is the primary marketing document sent to qualified buyers. A good CIM includes normalized financials, a business overview, market analysis, customer mix, and a growth story. Writing it is substantive work.
- 2
Buyer identification and outreach
A competent advisor contacts 50–200 qualified buyers depending on deal size — PE firms, strategics, family offices, and regional roll-ups. The quality of that buyer list determines whether you get a competitive process or a single-buyer conversation at their price.
- 3
NDA management and deal screening
Before sharing financials, every buyer signs an NDA. The broker manages that process, screens buyers for financial capability, and filters out time-wasters so you're not spending your time on buyers who can't close.
- 4
LOI negotiation and deal structuring support
Once buyers submit indications of interest, the broker runs the bid process, helps you compare terms (not just headline price), and advises on deal structure — cash at close vs. earnout, rollover equity, working capital adjustments.
- 5
Closing coordination with attorneys and accountants
The final 60–90 days of a deal involve legal due diligence, purchase agreement drafting, and closing mechanics. A good broker keeps the deal moving, manages the document flow, and prevents the deal from dying in the final stretch.
What's NOT Included
The broker fee does not cover everything. Budget separately for these transaction costs:
Additional Costs Not Covered by the Broker Fee
Attorney fees — $15,000–$40,000
You need your own M&A attorney to review the purchase agreement, negotiate reps and warranties, and advise on deal structure. Do not use your regular business attorney for this — it requires M&A-specific expertise.
CPA / QoE fees — $8,000–$25,000
The buyer hires a quality of earnings (QoE) accountant at their cost. But you may need your own CPA to prepare financials, normalize EBITDA for the CIM, and respond to QoE findings. Those hours add up fast.
Buy-side due diligence costs
The buyer pays for their own QoE, legal diligence, and operational assessment. However, these costs can slow the deal or trigger retrades if findings surprise the buyer — so your preparation matters even on costs you're not paying.
Post-close transition consulting
Most PE deals include a 6–24 month transition period where the seller stays on in some capacity. If that scope expands into a consulting arrangement, it's often a separate contract negotiated at close.
Business Broker vs. M&A Advisor: Fee Comparison
The two types of sell-side representation have meaningfully different fee structures. Choosing the wrong one for your deal size is a costly mistake in both directions — overpaying for an M&A advisor on a $1M deal, or underrepresented by a local broker on a $6M deal.
Business Broker
- Retainer: Often $0 (pure commission)
- Commission: 8%–12% of deal value
- Sweet spot: Deals under $5M
- Buyer network: Generalist or regional
- Process: Listing-based, smaller buyer pool
M&A Advisor
- Retainer: $2,000–$5,000/month
- Commission: 3%–6% of deal value
- Sweet spot: Deals $5M+
- Buyer network: PE firms and strategic acquirers
- Process: Managed auction, 50–200 buyers
See: How to find and vet an M&A advisor for your HVAC sale →
The math often surprises HVAC owners: an M&A advisor at 4% retainer + success on a $6M deal costs $240,000, while a broker at 8% on the same deal costs $480,000 — but if the advisor's managed process gets you $7M instead of $6M, the net difference is enormous. The fee comparison only makes sense when you're also comparing the likely outcomes.
How to Evaluate Whether the Fee Is Worth It
Not every advisor who charges a high fee delivers high value. Before signing an engagement letter, evaluate the advisor against these four criteria:
Did they give you a realistic valuation range upfront — not just a high number to win your listing?
Advisors who pitch an inflated valuation to get your signature often miss that number by 20%–30% when buyers actually bid. A realistic advisor who gets you to closing at their stated range is worth more than one who overshoots the promise.
Do they have a verified buyer list with PE firms actively acquiring HVAC companies?
Ask them to name the PE platforms, family offices, and regional roll-ups they've worked with in the last 24 months. A blank stare or vague answer is telling. A specific list of deal names and buyers is the answer you want.
Can they show you 2–3 comparable HVAC deals they've closed in the last 24 months?
Deal tombstones are public record. If they can't produce closed HVAC or home services transactions with deal value ranges and buyer names, they're either new to the sector or exaggerating their track record.
Are they offering a capped retainer with a clear success-fee structure, or asking for unlimited monthly billing?
A fair retainer arrangement caps total retainer paid (typically $15,000–$30,000 over a 6–9 month engagement) and credits some portion against the success fee. Unlimited monthly billing with no cap and no credit is a red flag. Read our guide on LOI negotiation for what else to watch in the engagement agreement.
Know Your Number Before You Call a Broker
Before you hire a broker, know what your business is worth. Run the free OffRamp HVAC Valuation Calculator to get your estimated range — so you walk into that first advisor meeting with a number, not a guess.
Run the Free HVAC Valuation CalculatorFrequently Asked Questions
Can I sell my HVAC business without a broker?
Yes, but buyers at the PE level expect representation. Going unrepresented in a PE deal almost always means leaving money on the table — PE buyers negotiate dozens of deals a year and have entire deal teams dedicated to that process. An unrepresented seller is at a significant structural disadvantage.
Is the broker's commission negotiable?
Yes. Everything is negotiable. The best leverage is a clean business with documented financials — brokers discount their fees for easy-to-sell businesses because they close faster and require less work. If your EBITDA is fully normalized, your financials are audit-ready, and you have a documented buyer list already interested, you have real negotiating leverage on the commission.
When does the broker get paid?
At close. A reputable broker earns nothing until you close a deal. The retainer (if any) is a separate monthly fee paid during the engagement period — it is not a down payment on the success fee. If the deal falls through, the broker keeps the retainer but receives no success fee. See our guide on what PE buyers ask during diligence to understand what can delay or derail a deal after the LOI.
OffRamp is a free valuation tool for HVAC business owners. We don't sell your information, represent buyers, or work on commission. The calculator and reports are educational tools — always consult a licensed M&A advisor before entering a sale process.