HVAC and electrical contractor Comfort Systems (NYSE: FIX) announced better-than-expected revenue in Q3 2026, with sales up 53.7% year on year to $3.77 billion. Its GAAP profit of $13.91 per share was 9.5% above analysts’ consensus estimates.

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Brian Lane, Comfort Systems USA’s Chief Executive Officer, said, “Strong ongoing demand and consistent excellence by our teams resulted in extraordinary results across every metric this quarter. As compared to the same quarter last year, Comfort Systems USA is reporting a 50% increase in revenue and a 70% jump in per share earnings. We also achieved remarkable cash flow exceeding $1 billion in a single quarter. Our teams continue their superb execution, providing great outcomes for our customers and communities.”

Company overview

Formed through the merger of 12 companies, Comfort Systems (NYSE: FIX) provides mechanical and electrical contracting services.

Revenue growth

Reviewing a company’s long-term sales performance reveals insights into its quality. Any business can experience short-term success, but top-performing ones enjoy sustained growth for years. Luckily, Comfort Systems’s sales grew at an incredible 33.9% compounded annual growth rate over the last five years. Its growth surpassed the average industrials company and shows its offerings resonate with customers, a great starting point for our analysis.

We at StockStory place the most emphasis on long-term growth, but within industrials, a half-decade historical view may miss cycles, industry trends, or a company capitalizing on catalysts such as a new contract win or a successful product line. Comfort Systems’s annualized revenue growth of 38.7% over the last two years is above its five-year trend, suggesting its demand was strong and recently accelerated.

Comfort Systems also reports its backlog, or the value of its outstanding orders that have not yet been executed or delivered. Comfort Systems’s backlog reached $17.81 billion in the latest quarter and averaged 60.2% year-on-year growth over the last two years. Because this number is better than its revenue growth, we can see the company accumulated more orders than it could fulfill and deferred revenue to the future. This could imply elevated demand for Comfort Systems’s products and services but raises concerns about capacity constraints.

This quarter, Comfort Systems reported magnificent year-on-year revenue growth of 53.7%, and its $3.77 billion of revenue beat Wall Street’s estimates by 10.7%.

Looking ahead, sell-side analysts expect revenue to grow 16.5% over the next 12 months, a deceleration versus the last two years. Still, this projection is eye-popping given its scale and indicates the market sees success for its products and services.

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Operating margin

Operating margin is an important measure of profitability as it shows the portion of revenue left after accounting for all core expenses — everything from the cost of goods sold to advertising and wages. It’s also useful for comparing profitability across companies with different levels of debt and tax rates because it excludes interest and taxes.

Comfort Systems has been an efficient company over the last five years. It was one of the more profitable businesses in the industrials sector, boasting an average operating margin of 12.3%. This result was particularly impressive because of its low gross margin, which is mostly a factor of what it sells and takes huge shifts to move meaningfully. Companies have more control over their operating margins, and it’s a show of well-managed operations if they’re high when gross margins are low.

Analyzing the trend in its profitability, Comfort Systems’s operating margin rose by 11 percentage points over the last five years, as its sales growth gave it immense operating leverage.

This quarter, Comfort Systems generated an operating margin profit margin of 16.6%, up 1.1 percentage points year on year. The increase was encouraging, and because its operating margin rose more than its gross margin, we can infer it was more efficient with expenses such as marketing, R&D, and administrative overhead.

Earnings per share

We track the long-term change in earnings per share (EPS) for the same reason as long-term revenue growth. Compared to revenue, however, EPS highlights whether a company’s growth is profitable.

Comfort Systems’s EPS grew at 62.6% compounded annual growth rate over the last five years, higher than its 33.9% annualized revenue growth. This tells us the company became more profitable on a per-share basis as it expanded.

Diving into Comfort Systems’s quality of earnings can give us a better understanding of its performance. As we mentioned earlier, Comfort Systems’s operating margin expanded by 11 percentage points over the last five years. On top of that, its share count shrank by 3.5%. These are positive signs for shareholders because improving profitability and share buybacks turbocharge EPS growth relative to revenue growth.

Like with revenue, we analyze EPS over a shorter period to see if we are missing a change in the business.

For Comfort Systems, its two-year annual EPS growth of 88.2% was higher than its five-year trend. We love it when earnings growth accelerates, especially when it accelerates off an already high base.

In Q3, Comfort Systems reported EPS of $13.91, up from $8.25 in the same quarter last year. This print beat analysts’ estimates by 9.5%. Over the next 12 months, Wall Street expects Comfort Systems’s full-year EPS to grow 19.4% from $46.31 to $55.28.

Key takeaways from Comfort Systems’s Q3 results

We were impressed by how significantly Comfort Systems blew past analysts’ revenue expectations this quarter. We were also glad its EBITDA outperformed Wall Street’s estimates. Zooming out, we think this quarter featured some important positives. Investors were likely hoping for more, and shares traded down 7.6% to $1,186 immediately after reporting.

Should you buy the stock or not? The latest quarter does matter, but not nearly as much as longer-term fundamentals and valuation, when deciding if the stock is a buy. We cover that in our actionable full research report which you can read here (it’s free).