HVAC Overhead: How Much Is Too Much?

An HVAC business can have strong gross margins on every job and still end up with weak profit at the bottom, and when that happens the culprit is almost always overhead. Overhead is the cost of being in business rather than the cost of doing any particular job, and because it does not attach to specific work, it tends to grow without anyone noticing in a way that job costs do not.

A truck payment here, a software subscription there, an administrative hire, a slightly bigger office, and over time the overhead base creeps up until it is consuming margin that should have been profit.

The difficult part is that overhead rarely announces itself, which is why so many contractors are surprised when strong job margins do not translate into a strong bottom line.

This post covers how to tell whether your HVAC overhead is too high, what a healthy overhead level looks like as a percentage of revenue, and where to look first when overhead is the thing standing between you and better profitability.

For the broader picture of HVAC margins and where overhead fits into the profitability stack, see HVAC Profit Margins: What's Normal and What's Not.

For how overhead should be organized in your books so it is actually visible, see HVAC Chart of Accounts Setup in QuickBooks.

What actually counts as overhead

Before you can judge whether your overhead is too high, you have to be clear about what belongs in the overhead category, because misclassification is one of the most common reasons contractors misread their own numbers.

Overhead is everything that keeps the business running but cannot be tied to a specific job. This includes office rent and utilities, administrative and office payroll, software and technology, general marketing and advertising, professional services like accounting and legal, business insurance that is not job-specific, the fixed portion of vehicle costs like truck payments and insurance, and owner compensation.

What overhead is not is the direct cost of doing the work, meaning the equipment, materials, burdened field labor, and the variable vehicle costs like fuel and maintenance that scale with how much work you do. Those direct costs belong in cost of goods sold and get measured through gross margin, not overhead.

The reason this distinction matters is that a lot of contractors accidentally blur the line, either by dumping variable job costs into overhead or by burying real overhead inside cost of goods sold. When the line is blurry, your overhead percentage is not measuring what you think it is measuring, and any judgment about whether it is too high rests on a number that is not clean.

Getting overhead correctly separated from job costs is the prerequisite for everything that follows, which is why the chart of accounts structure matters so much here.

What a healthy overhead percentage looks like

Once overhead is cleanly separated, you can measure it as a percentage of revenue and compare against general benchmarks, keeping in mind these are ranges rather than hard rules and the right number depends on your size and model.

For HVAC businesses doing $500,000 to $2 million in revenue, overhead commonly runs in the range of 18 to 28 percent of revenue. Smaller businesses in this range tend to sit toward the higher end because fixed costs like insurance, software, and basic administrative infrastructure do not scale down proportionally with revenue, so they consume a larger share of a smaller revenue base.

For HVAC businesses doing $2 million to $5 million, overhead commonly runs in the range of 15 to 22 percent of revenue. The economies of scale start to work in your favor around the $2 million mark, because the administrative infrastructure, software stack, and management overhead can be spread across more revenue, which lowers the percentage even as the absolute dollars rise.

When overhead runs above roughly 30 percent of revenue, something is usually structurally off, and it is worth a hard look at where the money is going.

That is not an automatic emergency, because there are legitimate reasons overhead might run high temporarily, but a number that high is a signal to investigate rather than a number to accept as normal.

Why "too much" is not just a percentage

The percentage benchmarks are a starting point, but overhead that is too high is not simply overhead above a certain number, and treating it that way leads to bad decisions. The real question is whether your overhead is producing a return, because overhead exists to make the business run better, not just to exist.

Consider two businesses both running 26 percent overhead.

In the first, that overhead includes a strong office manager who keeps the schedule full and collections current, a dispatch system that minimizes drive time, and marketing that reliably generates qualified leads. That overhead is productive, because it is directly enabling the revenue and efficiency that make the business work.

In the second business, the same 26 percent includes an administrative hire who is underused, three overlapping software subscriptions nobody fully uses, and marketing spend that has never been measured against the leads it produces. That overhead is unproductive, because it is consuming margin without generating a return.

The percentage is identical, but the businesses are in very different positions. This is why judging overhead purely by the number misses the point. A slightly high overhead percentage that is driving growth and efficiency can be perfectly healthy, while a lower overhead percentage full of waste can be a real problem.

The benchmark tells you where to look, but the judgment about whether overhead is genuinely too high depends on what each piece of it is actually producing.

Where overhead bloat usually hides

When overhead has crept too high, the cause usually traces to a handful of common culprits, and knowing where to look shortens the diagnosis considerably.

Administrative payroll is the most frequent one. Office and administrative headcount tends to grow during busy periods when the workload justifies it, but it rarely gets cut back when the workload settles, so the business ends up carrying more administrative cost than its current revenue supports.

Reviewing whether your administrative headcount matches your current revenue rather than the revenue you had at your busiest is often the single highest-value overhead audit you can do.

Software and technology stack is the second. Field service software, accounting software, dispatch tools, marketing platforms, communication tools, and the many smaller subscriptions accumulate over time, and businesses frequently pay for overlapping tools or for seats and features they no longer use.

A line-by-line review of every recurring software charge usually surfaces cuts that add up.

Owner compensation is the third, and it is a delicate one. If owner pay has grown to a level the business cannot actually support at its current size, it distorts the overhead picture and masks whether the underlying business is healthy. This is worth examining honestly, because a business that only looks profitable when the owner underpays themselves, or only looks lean when the owner overpays themselves, is not giving you an accurate read either way.

Facility and vehicle costs are the fourth. Office space that was sized for a larger business than you currently run, or a vehicle fleet carrying more fixed cost than your current job volume justifies, both inflate overhead.

These are harder to adjust quickly because they involve leases and loans, but they are worth evaluating when overhead is running high.

Marketing that is not measured is the fifth. Marketing spend is legitimate overhead, but only if it produces a return, and a lot of HVAC businesses spend on marketing without ever measuring the leads and revenue it generates. Marketing that cannot be tied to results is the easiest overhead to cut, because you are not giving up anything you can prove is working.

How to diagnose your own overhead

The practical way to evaluate your overhead is a structured review rather than a gut check, and it comes down to three passes.

The first pass is the trend. Pull your overhead as a percentage of revenue over the past two or three years and look at the direction. Overhead that is climbing as a percentage of revenue over time is the clearest warning sign, because it means your fixed cost base is growing faster than your revenue, which compresses profit. A stable or declining overhead percentage as you grow is the healthy pattern.

The second pass is the category audit.

Break overhead into its component categories and evaluate each one against what it produces. For every overhead category, ask whether it is generating a return that justifies the cost. This is where the productive-versus-unproductive distinction becomes concrete, because you are examining each piece rather than judging the total.

The third pass is the benchmark comparison. Measure your overhead percentage against the ranges above, using your revenue size as the guide. If you are well above the range for your size, that confirms there is something to find, and the trend and category passes tell you where.

All three passes depend on having books where overhead is cleanly separated from job costs and organized into meaningful categories. If your overhead is a single undifferentiated lump or is tangled up with job costs, none of these passes produce reliable answers, which is why the underlying bookkeeping structure is the foundation for any real overhead analysis.

What to do when overhead is too high

When the diagnosis confirms overhead is running too high, there are two paths to fixing it, and choosing the right one depends on what you found.

The first path is cutting. If the review surfaced genuine waste, meaning overhead that is not producing a return, the fix is straightforward: eliminate the unproductive spending. Unused software, underused administrative capacity, unmeasured marketing, and facility or vehicle costs beyond what the business needs are all candidates for reduction, and cutting them lowers the overhead percentage without giving up anything that was actually working.

The second path is growing into it. Sometimes the overhead is productive but the revenue is simply not high enough yet to support it, which shows up as a high overhead percentage even though the overhead itself is sound. In that case the fix is not cutting but growing revenue, because the same overhead spread across more revenue produces a healthy percentage.

This is common for businesses that have invested ahead of growth, building the infrastructure to support a larger operation before the revenue has caught up. Cutting productive overhead in that situation would be a mistake, because you would be dismantling the capacity you need to grow.

Distinguishing between the two paths is the whole point of the category audit, because the wrong move is expensive in both directions. Cutting productive overhead kneecaps your growth, while trying to grow your way out of genuine waste just means you are carrying that waste at larger scale. The category audit tells you which situation you are actually in.

Where this connects to the books

Every part of overhead analysis depends on the quality of your bookkeeping, which is the recurring theme across all of these HVAC benchmarks. You cannot measure your overhead percentage accurately if overhead is not cleanly separated from job costs. You cannot run the category audit if your overhead is a single lump rather than organized into meaningful categories. And you cannot track the trend over time if your books have not been structured consistently.

The overhead question is a bookkeeping question as much as a management question, because the analysis is only as good as the financial structure underneath it.

At Prophet Accounting, we work with HVAC contractors and other home service trades across Port St. Lucie, the Treasure Coast, and nationwide.

We structure your books so overhead is cleanly separated from job costs and organized into categories you can actually evaluate, which is what makes real overhead analysis possible rather than guesswork.

If your job margins look strong but your bottom line does not, overhead is usually the place to look, and clean books are how you find it.

Schedule a consultation at prophetaccounting.com/contractors.

For a quick read on monthly bookkeeping costs, our pricing calculator gives you a ballpark in about two minutes.