There is a version of this conversation that starts with the listing price. That is the wrong version.

Most buyers walk into an HVAC acquisition anchored to a number the broker put on a listing, something like 3.5x, and immediately start debating whether that multiple is “fair.” But fair is not the question that matters. The question that matters is whether the deal clears SBA underwriting at that price, whether you can actually service the debt and still have enough cash left to run the business. Those are two completely different calculations. Confusing them is how buyers overpay and end up cash-strapped from day one.

Here is how HVAC business SDE multiples actually work, what moves them up or down, and how to figure out quickly whether a deal pencils before you burn months in due diligence.

What Is an SDE Multiple in an HVAC Acquisition?

An SDE multiple is the factor applied to a business’s seller’s discretionary earnings to arrive at an acquisition price. If an HVAC company generates $400K in SDE and lists at 3.0x, the asking price is $1.2M. Simple enough on the surface.

SDE itself is the business’s net profit plus the owner’s salary, personal expenses run through the business, non-recurring costs, depreciation, and amortization. It represents the total economic benefit available to a full-time owner-operator. For HVAC companies specifically, that figure is sensitive to how the seller classifies technician wages, fuel costs, and equipment depreciation. Add-backs in this industry need real scrutiny because the line between a legitimate personal expense and a core operating cost gets blurry fast when there are trucks, tools, and fuel cards involved.

The multiple is what buyers haggle over. But the SDE figure is where the real leverage sits. Get that number wrong and the multiple is meaningless.

What Pushes HVAC Multiples Higher (And What Crushes Them)

HVAC businesses in the $500K to $5M acquisition price range typically trade somewhere between 2.5x and 4.5x SDE. That is a wide band, and where a specific company falls depends on a handful of factors that lenders and buyers both care about.

What pushes multiples toward the top of that range:

Recurring revenue is the biggest driver. A company with 300 active maintenance contracts and a 75% renewal rate commands a premium over a purely transactional shop. Predictable revenue means predictable SDE, which means lower risk for everyone involved.

Geography and defensibility matter too. Established routes in a dense suburban market with low technician turnover are harder to replicate than a company winning jobs off Google Ads in a competitive metro where the next guy can outbid you tomorrow.

Owner-independent operations push multiples up because the risk of revenue walking out the door on closing day drops significantly. If the owner is running zero service calls and the business operates through a service manager, buyers will pay more for that stability.

Fleet condition and equipment age reduce the near-term capital expenditure a buyer has to model in. And licensing transferability is one that catches people off guard. In states where the business holds a master HVAC license tied to the seller personally, that creates a transition risk that compresses multiples unless there is a qualified employee who can hold the license post-close.

What compresses multiples:

  • Heavy owner-operator dependency. If the seller is the primary technician, estimator, and customer relationship holder, expect pushback from both buyers and lenders.
  • Customer concentration. One commercial client representing 30% of revenue is a serious valuation haircut.
  • Deferred maintenance on fleet or equipment.
  • Weak or inconsistent books. HVAC companies that co-mingle personal and business expenses require heavy add-back documentation, and lenders are skeptical of high add-backs without clean paper trails.

The DSCR Math That Actually Determines Your Multiple

Here is the part most acquisition forums skip entirely.

Even if you and the seller shake hands on an HVAC SDE multiple that feels fair, the deal only works if it clears SBA debt service coverage requirements. And this is where we see buyers get into trouble by anchoring to the wrong threshold. SBA lenders technically require a DSCR of at least 1.25x. But 1.25x is not a target. It is a danger zone. At 1.25x coverage, one soft quarter wipes out your margin entirely. Most experienced acquisition lenders want to see 1.5x or higher, and at Regalis we target 2.0x before we feel comfortable bringing a deal to a lender. That 2.0x number is the floor where a deal actually has breathing room.

Let’s run a quick model. Say you are looking at an HVAC company with $380K in SDE. The seller is asking 3.5x, which puts the acquisition price at $1.33M. You come in with a 10% equity injection of $133K and finance the remaining $1.197M through SBA 7(a) over 10 years at roughly 10.5% interest.

Your annual debt service on that loan is approximately $196K.

$380K in SDE divided by $196K in debt service gives you a DSCR of 1.94x. That clears comfortably and leaves real cushion for the inevitable bumps during ownership transition.

Now add a seller note. If you negotiate a 10% seller note on full standby (meaning zero payments and zero interest during the SBA loan term), your effective debt service stays the same and the seller note does not factor into coverage calculations during that period. That is a structure we have used on the vast majority of our deals. It protects your cash flow post-close while still giving the seller what they need to feel comfortable with the overall price.

Now run the same company at 4.2x. Acquisition price jumps to $1.596M. Equity injection rises to $159.6K. Debt on $1.436M over 10 years at 10.5% runs about $235K annually. DSCR drops to 1.62x. Still clears, but the cushion is thinner. Revenue softens in year one (which it often does during a transition), and you are sweating.

Push it to 4.5x and the coverage tightens further. That is where lender conversations get difficult and deals start dying.

The multiple is not just a negotiation variable. It is a structural constraint dictated by the cash flow math.

Reading Add-Backs in HVAC Businesses

HVAC SDE figures frequently include significant add-backs. Buyers need to stress-test every single one before accepting the stated multiple as a baseline.

Common add-backs in HVAC acquisitions:

Owner salary above market. If the owner pays himself $280K and a qualified GM replacement would cost $120K, the adjusted SDE drops by $160K. That alone can shift the effective multiple by a full turn.

Personal vehicle and fuel costs. Legitimate if the owner drove a personal vehicle for business. Less legitimate if it is a second F-250 his wife uses. (Side note: we have seen this exact scenario more times than you would expect. Ask for the vehicle titles and registration.)

One-time equipment purchases or repairs. Legitimate if truly non-recurring. But here is the thing: if the company buys one new truck every two years and calls each one a non-recurring add-back, that is a recurring capex item that should reduce SDE. Period.

Health insurance and benefits. Standard add-back and generally clean.

Depreciation. Included in SDE by convention, but in an HVAC company with an aging fleet, the economic depreciation may be higher than the accounting depreciation. Run your own capex replacement schedule against their depreciation numbers.

The stated HVAC business SDE multiple is only meaningful if the SDE figure itself holds up under scrutiny. We have seen HVAC listings where the adjusted SDE after cleaning up the add-backs was 25% to 30% lower than the broker-advertised number. At 3.5x, that gap is enormous. At 4.0x, it is deal-breaking.

HVAC Seasonality and Why a Single Year Is Not Enough

HVAC companies have real seasonality in most climates. This matters when you are evaluating trailing twelve-month versus annual SDE figures.

A company that does most of its revenue in summer cooling season will show wildly different monthly cash flows. Some sellers present the peak TTM period to make the SDE look stronger. Make sure you are reviewing at least 3 years of tax returns, not just the most recent 12 months.

You also want to normalize for weather events. A company in the Southeast that had an unusually cold winter two years ago may show a one-time SDE spike from emergency heating calls. That is not a repeatable baseline. Strip it out.

When evaluating the hvac business sde multiple, always anchor to a 3-year average of tax-return-verified earnings as your primary reference point rather than the broker’s recast P&L. Use the recast P&L to understand the business. Use the tax returns to negotiate the price.

Three years of returns. Minimum.

So That Covers the Valuation Side. The Deal Structure Side Is Where Most Buyers Actually Trip Up.

Interest rates matter because they directly affect debt service, which directly affects the multiple that clears SBA underwriting.

At current SBA interest rates (which float with the prime rate plus a spread and have been running in the 10% to 11% range for most of the past two years), a healthy HVAC business needs to generate roughly 1.5x to 2.0x its annual debt service in SDE to be bankable. We aim for that 2.0x target on every deal.

A deal that made sense at 4.0x when rates were at 6% may only work at 3.2x to 3.4x at current rates. On a $400K SDE business, that represents a $240K to $320K gap in purchase price. Not a small difference.

Sellers who bought or listed in 2020 or 2021 often have price expectations anchored to the low-rate environment. Part of the negotiation is recalibrating those expectations against the actual debt service math their buyer has to manage post-close. That is not a comfortable conversation, but it is a necessary one.

And here is something buyers routinely underestimate: working capital. You need cash on hand post-close to cover payroll, parts inventory, fuel, insurance, and overhead while the ownership transition settles. For HVAC businesses, plan for 2 to 6 months of operating expenses set aside as working capital. That money is separate from your equity injection and separate from the SBA loan proceeds. If you do not budget for it, you close the deal and immediately start borrowing on a credit line to make payroll. We have watched that play out enough times to know it kills momentum in the first 90 days.

INTERNAL LINK: sba-7a-rates has more on how current SBA rate structures affect deal sizing.

How the Seller Note Makes a Higher Multiple Bankable

A well-structured seller note can make a deal work at a higher multiple than the base SBA math would support on its own. This is one of the most important structural tools in any acquisition, and it is especially useful in HVAC deals where seller expectations tend to run high.

Here is why it works. If a seller is asking 3.8x on an HVAC business and the SBA-financed portion alone pushes DSCR below our 1.5x floor, structuring 10% of the purchase price as a full standby seller note removes that portion from the lender’s coverage calculation for the standby period. The lender only underwrites against the SBA debt service, not the deferred seller note obligation.

The result: a deal that would not pencil at 3.8x on SBA alone can clear underwriting with the right structure.

Seller gets a higher effective purchase price. Buyer gets a bankable deal with adequate coverage. Lender sees acceptable DSCR. That is the outcome everyone should be working toward.

Our standard on seller notes: full standby, zero interest, zero payments for the duration of the SBA loan term. We achieve these terms on more than 90% of the deals we take through underwriting. The key is getting lender buy-in early (not after the purchase agreement is signed) and making sure the standby terms are documented correctly from the start.

INTERNAL LINK: seller-note-structure has a more detailed walkthrough of how standby seller notes work in practice.

Frequently Asked Questions

What is a typical SDE multiple for an HVAC business?

Most HVAC businesses in the $500K to $5M range trade between 2.5x and 4.5x SDE. Companies with strong recurring revenue from maintenance contracts, owner-independent operations, and clean financials land toward the higher end. Heavily owner-dependent businesses with concentrated customer bases trade closer to 2.5x to 3.0x. The SBA-financeable multiple depends on current interest rates, your debt service, and whether the deal clears a healthy DSCR, which we target at 2.0x.

How do I calculate whether an HVAC SDE multiple works with SBA financing?

Take the SDE, divide it by your projected annual debt service on the SBA loan, and check that the resulting DSCR hits at least 1.5x (our target is 2.0x, and anything below 1.5x is a red flag). Annual SBA 7(a) debt service on a 10-year loan at current rates runs roughly 16% to 17% of the loan amount. If the debt service consumes more than roughly half of SDE, the deal is likely too tight to finance with adequate breathing room.

Do HVAC maintenance contracts increase the SDE multiple?

Yes, materially. Recurring revenue from maintenance contracts is more predictable than transactional revenue, which reduces risk for both the buyer and the lender. A company with 200 to 300 active maintenance contracts at consistent renewal rates can command a 0.5x to 1.0x premium over a comparable transactional shop. Lenders look more favorably on recurring revenue businesses because forward cash flow is more certain.

Can you buy an HVAC business with 10% down using an SBA loan?

Yes. SBA 7(a) requires a minimum 10% equity injection on a business acquisition. On a $1.5M HVAC deal, that is $150K. The equity injection can come from savings, a 401(k) rollover through a ROBS structure, a home equity line, or gifted funds with proper documentation. The remaining 90% is financed through the SBA loan, which runs up to 10 years for business acquisitions. Your CPA should review the most tax-efficient injection method for your situation.

What kills an HVAC acquisition at the SBA underwriting stage?

The most common deal-killers are insufficient DSCR (SDE too low relative to the purchase price and resulting debt service), excessive add-backs that lenders refuse to credit, key-man risk where the seller holds the license or all customer relationships personally, and customer concentration above 20% to 25% with any single client. Unresolved tax liens, significant deferred fleet maintenance, or a recent year with a sharp SDE decline will also slow or stop underwriting.

Thinking About Acquiring an HVAC Business?

HVAC is one of the more compelling sectors for SBA-financed acquisitions. Recurring revenue, essential services, and strong regional defensibility make these companies attractive when the deal structure is right.

But getting the structure right means running the SDE multiple against the actual SBA debt service math from day one. Not after you have already agreed on a price. Not after you have spent two months in diligence on a deal that was never going to clear underwriting.

We work with serious buyers on exactly this kind of analysis. Regalis Capital sources deals, evaluates SDE quality, models debt coverage, structures seller notes, budgets for working capital, and manages the SBA process from LOI to close.

If you are looking at HVAC acquisitions and want a team that reviews over 100 deals per week and knows what clears underwriting, start here.