Is Quanta Still The Best Way To Own Tech’s Building Boom?
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Investors buy both Quanta Services (PWR) and Comfort Systems USA (FIX) for the building boom around large technology customers. A utility business that works on the power grid serves as the foundation for Quanta, while Comfort Systems handles heating, air conditioning and electrical contracting inside the buildings. Between October 6 and November 4, Comfort Systems stock lost 40.0% and Quanta stock lost 19.3%, in a month when both reported record quarters. On November 4 alone, Quanta fell 11.7% and Comfort Systems fell 15.1%. So what did each company tell investors about the year ahead?
Quanta Raised Revenue Guidance; Comfort Systems Expects Slower Growth
On October 29, Quanta raised its 2026 revenue guidance to $41.3 billion to $41.6 billion, up from the $39.5 billion forecast in its July 30 release. Management also said it sees the opportunity for strong double-digit growth in adjusted earnings per share again in 2027, supported by a record backlog of about $64 billion.
Comfort Systems provided its outlook during its October 23 call. Management expects same-store revenue to grow in the mid-40% range in 2026 and in the mid-20% range in 2027. The company’s backlog reached a new high of $17.8 billion, marking an eighth sequential increase in a row.
These statements deliver two different kinds of news. Quanta raised a forecast for a year that is nearly over and pointed to an opportunity for more earnings growth in 2027. Comfort Systems estimates it will grow revenue more slowly in 2027 than in 2026, even as its backlog keeps rising. Quanta’s 2027 view is about earnings per share, not revenue.
Quanta’s Debt Versus Comfort Systems’ Reliance On Tech
The utility business makes up about $20 billion of Quanta’s electric segment. On the October 29 call, management said margins there stay at 10% to 12% by design. After issuing senior notes in August, Quanta owed $5.2 billion more than it held in cash at September 30. Quanta’s debt is still small compared to the size of the company: total debt equals 8.6% of its market value, against 19.2% for the S&P 500.
Comfort Systems operates in the opposite position, holding $1.78 billion more cash than debt. The risk lies in a reliance on one kind of customer: technology customers made up 59% of Comfort Systems’ revenue in the first nine months of 2026, up from 42% in the prior year. Management expects capital spending of 4% to 5% of revenue in 2026 as the company expands its modular business.
Comfort Systems Leads On Earnings Multiple And Margin
Comfort Systems stock trades at 23.5 times its trailing earnings, against 51.9 times for Quanta. Over the twelve months to September 30, Comfort Systems kept 16.7% of revenue as operating income, compared to 6.8% at Quanta. Comfort Systems also grew faster over those twelve months, posting a 50.7% revenue increase against 37.1% for Quanta.
Growth is accelerating at Quanta, however. Revenue growth there has picked up every quarter for a year, climbing from 17.5% in the September 2025 quarter to 57.4% in the September 2026 quarter. That latest pace runs ahead of the 53.7% Comfort Systems reported for the same quarter.
Comfort Systems comes out ahead on debt and the twelve-month measures, offering a lower earnings multiple, a wider margin, faster growth and less debt. Quanta leads on the pace of its latest quarter and on a recently raised forecast, while Comfort Systems expects its own revenue growth to slow in 2027. On the balance of these measures, Quanta is not the best way to own the boom: Comfort Systems leads on more of them. Comfort Systems’ revenue growth is the result to watch in its next report, expected in February 2027.
Beyond PWR: A Systematic Way To Invest
Before you decide on PWR, consider a better choice. Since its September 2020 launch, the Trefis High Quality (HQ) Portfolio has returned 105%, ahead of a benchmark that combines the S&P 500, S&P MidCap and Russell 2000, without betting on one stock.
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