Your books can be perfectly clean and you might still not know if your HVAC company metrics are healthy. Most HVAC contractors never hear that from their bookkeeper because most bookkeepers stop at clean books.
They don’t tell you what the numbers mean.

Bookkeeping records what happened. It answers “did we get paid” and “did we pay our bills.” It doesn’t answer the question that runs through your mind at 2am, which is whether the business you’re running is getting stronger or quietly running out of time.
That question needs metrics and meaning, not just numbers put in boxes on a spreadsheet.

Here are the three metrics that matter most.

Metric 1: Gross Margin by Job Type (Install vs. Service)

What it is. The percentage of revenue left over after direct job costs, calculated separately for install work and service work instead of blended together.

How to calculate it. Take revenue for each job type, subtract direct costs (materials and labor) tied to that job type, divide by the revenue.

Do it twice, once for install, once for service.

Never combine them.

What healthy looks like. Service work typically runs higher gross margins, often 40 to 50 percent, because labor is the main cost and materials are minimal. Install work usually sits lower, somewhere in the 20 to 30 percent range, because equipment and materials eat a bigger share of the job.

What to do when it’s off. If Install margin is dropping below 20 percent, that usually means you’re either underbidding jobs, absorbing material cost increases without adjusting your pricing, or both. Pull your last five install jobs and compare bid to actual cost. The gap will tell you which one it is.

This is the piece of HVAC job costing most contractors skip. They know their overall margin. They don’t know which half of the business is actually generating it, and that’s the difference between fixing the right problem and fixing the wrong one for six months straight.

Metric 2: Revenue per Technician (Labor Productivity Ratio)

What it is. Total revenue generated divided by the number of field technicians. It tells you how much each person on your payroll is actually producing.

How to calculate it. Take your revenue for a given period, usually monthly or quarterly, and divide by your headcount of billable field technicians. If a Tech was with you for half of the quarter and you’re calculating for a quarter, then count that Tech as a half. Don’t count office staff, and don’t count yourself unless you’re regularly running calls.

What healthy looks like. This number varies by market and by mix of install versus service work, but the direction matters more than the exact figure. It should be climbing (not radically) over time, not flat, not falling.

It should climb for three reasons: First, as your Techs gain experience, they execute better. Second, you should get better at quoting jobs.

Using information from the Gross Margin discussion above, you should expect that minimum levels for revenue per tech are 1.8 times their salary. Third, you get better at scheduling and routing jobs for efficiency.

What to do when it’s off. A flat or declining number usually means one of two things. Either your techs are spending more time on non-billable work, drive time, callbacks, admin, or your scheduling is leaving gaps in the day that never make it onto an invoice. Even with a Trip Charge, windshield time is likely break-even revenue.

If it’s increasing dramatically in a short period of time, your techs might be spending too little time on the work, and you may need to get in front of quality problems.

Both are fixable once you see them, and neither is visible from a P&L alone.

Metric 3: Quick Ratio

What it is. A measure of whether your operating cash flow can cover your short-term obligations, like payroll, loan payments, and recurring bills.

How to calculate it. Divide operating cash flow by current liabilities. A ratio above 1.0 means you can cover what you owe out of cash flow alone. Below 1.0 means you’re relying on savings, credit, or timing to get through. Above 2.0 usually means you have excess cash in the business, but don’t interpret that as a free license to go buy anything you want without proving the ROI first. 

What healthy looks like. Above 1.0 consistently, with enough cushion to absorb a slow month without scrambling.

What to do when it’s off. This is the metric that burns you in February, three months after your summer revenue peak has disappeared into overhead, materials, payroll, and equipment purchases nobody tracked against the season. This ratio usually drops heading into the slow months, you should be building a cash reserve during the summer surge instead of spending it as fast as it comes in.

Bonus Metric: Using AR Aging as an Early Warning System

Your Accounts Receivable Aging Report isn’t just a list of who owes you money. When you read it right, it’s the earliest signal you’ll get that a cash flow problem is about to happen.

Watch the 30, 60, and 90-day buckets. A rising 60-day balance means the market is having a hard time paying on time and starting to slip, and that’s usually the first sign of trouble. It could alternatively mean that your collections process has broken down and you need to figure out whether it’s on the client’s end or a gap in your own invoicing and follow-up.

Catch it in the 60-day column and it’s a phone call. Let it sit for 90 days, and it can turn out that you did work for free…

How Often You Should Be Reviewing These Numbers

Monthly, at the absolute minimum, for all three core metrics. Weekly for accounts receivable and quick ratio during your peak season, when the swings are big and the cost of missing a shift is highest. If you’re only looking at these once a quarter, you’re finding problems long after the point where they were cheap and easy to fix, and where you could have avoided repeating them.

What These Numbers Actually Tell You About Your Business

A bookkeeper tells you what happened last month. These three numbers, reviewed consistently, tell you where your business is headed before it gets there. That’s the difference between reacting to a cash crunch in November and seeing it coming in August, and it’s the difference between a bookkeeper who records your numbers and one that helps you use them.

If you’re looking for the fundamentals first, our companion guide covers exactly what you need to know before layering in these metrics.

The Numbers Alone Don’t Fix Anything

Tracking these three small business metrics tells you where your business stands. Acting on what they show you is the part that changes your success.

That’s where an advisor earns their keep. See how The Numbers Advisors works with HVAC companies in Tucson.