SDE vs EBITDA: Which Valuation Method Actually Applies to Your HVAC Business?

If you've started talking to buyers — or just done some research on how to value an HVAC business — you've probably heard two different numbers from two different sources. One buyer says “4x EBITDA.” A business broker mentions “3x SDE.” They sound like variations of the same thing. They're not.

SDE vs EBITDA for an HVAC business isn't just a terminology difference. It's a different calculation applied to a different earnings figure, used by different types of buyers, in different market segments. Use the wrong one as your benchmark and you could anchor your asking price $400,000 low — or walk into a PE conversation with a number that makes no sense to the person across the table.

Here's how to tell which method applies to you, what each one actually means, and why it matters.

What Is SDE — and Who It's For

SDE stands for Seller's Discretionary Earnings. The formula is straightforward: start with net profit, then add back the owner's salary, owner benefits, and any other “discretionary” expenses the business runs through — personal vehicle costs, phone bills, travel that's really personal. You're essentially reconstructing what the business would earn if the owner was also paid a fair wage for the job they're doing.

That last part is the key. SDE is used when the buyer is assuming they'll replace you as the operator. They're buying your revenue, your customer base, and your cash flow — including what you're taking out of the business as compensation. So HVAC seller's discretionary earnings capture the full economic benefit the owner is extracting from the business, which becomes the purchase price basis.

SDE is the standard valuation method for owner-operated HVAC businesses, typically under $2–3 million in annual revenue. This is the small business market: individual buyers, search fund operators, local competitors looking to acquire. The buyers are people who plan to run the business themselves or install a manager close to that level.

What Is EBITDA — and Who It's For

EBITDA stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. Unlike SDE, it doesn't add back the owner's salary. Instead, it strips out financing costs and non-cash charges to get to a clean operating earnings figure that reflects the business's performance independent of how it's capitalized.

EBITDA is used when the buyer isn't replacing the owner as operator — they're adding the company to a platform. Private equity roll-ups don't buy HVAC businesses so someone can go run a service truck. They buy cash flow to bolt onto a larger entity that already has management infrastructure in place. Owner comp isn't the point because the owner typically isn't sticking around in an operating role.

This is the PE market, and it's an entirely different buyer pool with different math, different expectations, and different deal structures. PE-backed roll-ups almost universally underwrite on EBITDA, not SDE, because their platform already has a management layer and they're buying incremental cash flow — not a job.

The Rule of Thumb on Crossover

The practical dividing line is around $1 million in earnings.

The crossover point matters enormously because both the base earnings figure and the multiple change. SDE is a higher starting number than EBITDA (because it adds back owner comp), but it carries a lower multiple. EBITDA is a lower starting number, but the multiple range is higher. Depending on your specific financials, the two methods can produce wildly different valuations — and knowing which one a buyer is using tells you a lot about what kind of buyer they are.

A Worked Example: Same Business, Two Calculations

Take an HVAC company with $400,000 net profit. Here's how the math splits:

The EBITDA number is higher here — not because the business is more valuable to the EBITDA buyer, but because the multiple premium for PE-grade acquisitions more than offsets the lower base. That said, the EBITDA buyer at 5x is almost certainly a PE firm or PE-backed platform. If a PE firm is calling you about an add-on acquisition, they're running EBITDA math. A local business broker, a regional competitor, or an individual buyer is running SDE math.

Knowing which conversation you're in determines which number you should have in your head.

What PE Buyers Actually Use

If a private equity firm or PE-backed HVAC platform has reached out to you, they are thinking in EBITDA multiples. Full stop.

PE buyers aren't buying a job. They're buying cash flow to plug into a management infrastructure that already exists. The owner's salary is irrelevant to them — they'll install a general manager or absorb dispatch and operations into the platform. What matters is the EBITDA the acquired business contributes to their consolidated P&L.

The current HVAC M&A market has PE capital competing aggressively for quality operators, which has pushed multiples up. For a well-run HVAC business with a strong maintenance agreement base, minimal owner dependence, and clean financials, you're looking at 5x to 8x EBITDA. Businesses that check every box — recurring revenue, operational systems, documented customer history — sit at the high end or above.

The Add-Backs Conversation

Whether you're calculating SDE or EBITDA, add-backs are where deals get negotiated — and sometimes where they fall apart.

Add-backs are legitimate expenses run through the business that a buyer would eliminate post-acquisition. They increase your earnings base and therefore your valuation. Common examples in HVAC:

Here's the catch: buyers will scrutinize every add-back. Their accountants and QoE (Quality of Earnings) team will look for documentation behind each adjustment. If you can't support it with a receipt, a contract, or a clear explanation, expect it to get cut — and watch your valuation drop accordingly.

Know Which Number You're Talking About

The SDE vs EBITDA question for your HVAC business isn't academic. It determines which buyer pool you're benchmarking against, which multiple range applies, and how to present your financials in any serious conversation.

Small business buyers use SDE. Private equity buyers use EBITDA. The crossover happens around $1M in earnings. And regardless of which method applies to you, add-backs are worth documenting before anyone opens a data room.

Run the free HVAC valuation calculator at offramp.madethis.ai — it uses EBITDA-based PE methodology so you see the number the way a private equity buyer would. The Full Valuation Report ($49) goes deeper, covering add-backs, SDE crossover, and the five factors that move your multiple up or down before you ever talk to a buyer.

OffRamp is a valuation tool, not a licensed financial advisor. Results are estimates based on market data and should not be used as the sole basis for any business decision. Always consult with a qualified M&A advisor before entering a sale process.