Comfort Systems vs. Carrier: Which HVAC Stock has Better Potential?

Sraddha Singha December 16, 2025

FIX CARR

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Key Takeaways

FIX benefits from surging data center activity, with Technology now driving 42% of total revenues.
Comfort Systems posted a record $9.38B backlog, increasingly weighted toward large, complex projects.
Carrier faces residential HVAC weakness despite strength in commercial systems and global data centers.

The United States HVAC (heating, ventilation and air conditioning) market is experiencing strong multi-year growth, driven by rising energy efficiency demands, the adoption of smart technology, construction booms and government funding initiatives. Firms like Comfort Systems USA (FIX - Free Report) and Carrier Global Corporation (CARR - Free Report) , whose business operations are directly tied to HVAC and related markets, are benefiting from these favorable trends.

Besides, the three consecutive Fed rate cuts from September 2025 to December are a cherry on the cake. On Dec. 10, 2025, the Federal Reserve slashed its interest rates by another 0.25 percentage points, setting the benchmark between 3.5% and 3.75%. After these cuts, the Federal Open Market Committee, or FOMC, is now expecting only one rate cut in 2026, with another one anticipated in 2027. The reduction in borrowing rate catalyzes the ongoing favorable market trends, boosting more project initiations, leading to a promising future.

Comfort Systems offers installation and contracting services across HVAC markets and is currently focused on seeking opportunities for large-scale projects and investing additional cash for inorganic growth initiatives. Conversely, Carrier Global’s business surrounds HVAC equipment and technology and is mainly focused on advancing growth through technological advancements and new product launches.

Let’s dive deep and closely compare the fundamentals of the two stocks to determine which one is a better investment now.

The Case for Comfort Systems Stock

Comfort Systems is realizing benefits from robust demand trends across the Technology sector, mainly because of strong data center and chip manufacturing-related activities. So far in 2025, the Technology sector contributed 42% of the total revenues, reflecting growth from 32% a year ago, thanks to hyperscalers and related infrastructure developers continuing to invest aggressively, despite ongoing macro headwinds.

As of Sept. 30, 2025, the company had a record backlog of $9.38 billion, with a same-store backlog of $9.2 billion, indicating year-over-year increases of 65.1% and 62%, respectively. Management emphasized that the backlog is high quality, well-priced and increasingly weighted toward large and complex projects that align with FIX’s core capabilities. Comfort Systems is benefiting from customers committing earlier and booking projects further out, with meaningful portions of the backlog now extending into 2026 and 2027. Modular construction has become a key differentiator in this market, enabling faster delivery and labor efficiency.

Beyond data centers, industrial and institutional markets remain supportive. Industrial customers represent roughly two-thirds of revenues, while institutional verticals such as healthcare, education and government continue to show steady activity, including new hospital builds and expansions. The company continues to post record margins and cash flow, driven by disciplined project selection, strong pricing, labor sharing across operating companies, and productivity gains from BIM, prefabrication and modularization.

Apart from market tailwinds, FIX’s inorganic growth efforts are also notable aspects. On Oct. 1, 2025, FIX acquired two electrical companies based in Western Michigan and Southern Florida, FZ Electrical and Meisner Electric, respectively. These acquisitions are expected to enhance Comfort Systems' market presence across industrial and health care capabilities, and combinedly are expected to deliver more than $200 million of incremental annual revenues and $15-$20 million of incremental annual EBITDA.

The Case for Carrier Stock

Carrier is gaining from the continued outperformance of Commercial HVAC, particularly in the Americas. It has built a robust and expanding backlog in this segment, supported by significant capacity investments, differentiated product launches and rising win rates. Data centers are a standout growth vector, with the company on track to double annual data center revenues to around $1 billion and with backlog visibility now extending into 2027-2028. CARR secured multiple marquee project wins, including large hyperscaler contracts and a notable data center order in the Middle East, alongside other large infrastructure projects such as the Shanghai Oriental Hub, reinforcing its leadership in complex and energy-efficient system solutions.

Apart from data center tailwinds, CARR is benefiting from resilient non-data-center commercial HVAC demand, supported by healthcare, infrastructure, manufacturing reshoring and select commercial real estate activity. New product introductions, such as high-efficiency air-cooled chillers with magnetic bearing technology, have strengthened differentiation and improved Carrier’s ability to win. Notably, digital platforms such as Abound and Lynx continue to gain traction through multi-year software wins and rising paid subscriptions, adding a higher-margin, more predictable revenue stream.

Beyond the Americas, international long-term market trends remain strong. In Europe, electrification and decarbonization policies are driving structural demand for heat pumps, with Carrier benefiting from strong Viessmann technology and an improving mix. Besides, in India, Japan and the Middle East, commercial HVAC and transportation solutions continue to deliver double-digit growth.

However, despite strong positioning in several growth areas, the company is struggling with a sharp downturn in the North American residential HVAC market. Weak consumer demand, slower sell-through and elevated channel inventories drove steep volume declines, particularly in the third quarter of 2025. This residential softness created under-absorption in factories and weighed heavily on segment profitability, forcing Carrier to right-size production and accelerate restructuring actions. Besides, ongoing weakness in China’s residential and light commercial markets continues to offset solid growth in India and the Middle East. Tariffs, while currently neutral on profit, still require ongoing pricing actions, and restructuring costs and workforce reductions underscore the cyclical and execution risks embedded in the current environment.

Stock Performance & Valuation

As witnessed from the chart below, in the past six months, Comfort Systems’ share price performance stands significantly above Carrier, the Zacks Building Products - Air Conditioner and Heating industry and the broader Construction sector.