Comfort Systems or Carrier: Which HVAC Stock Is a Buy Now?

Comfort Systems USA (FIX) is positioned as a stronger investment within the HVAC sector compared to Carrier Global (CARR), driven by its focus on high-growth technology and industrial sectors, evidenced by a record $6.9 billion backlog and a 57.1% stock surge over three months. While Carrier, a global manufacturer, projects mid-single-digit sales growth and nearly 20% adjusted EPS growth for 2025, it faces headwinds like $300 million in tariff-related costs and light commercial softness, leading to a more modest 25.9% stock gain. Comfort Systems' estimated 32.1% EPS growth for 2025 and its Zacks #1 Strong Buy rating suggest superior upside, despite its premium valuation, making its U.S.-centric, backlog-rich operations appear more resilient than Carrier's broader global exposure.

Analysis

Comfort Systems (FIX) and Carrier Global (CARR) are both positioned to benefit from HVAC sector tailwinds, but their operational focus and risk profiles present a clear divergence for investors. Comfort Systems, a U.S.-centric commercial contractor, is demonstrating exceptional growth momentum, driven by a record $6.9 billion project backlog and deep exposure to high-growth technology sectors like data centers and chip fabrication, which now account for 37% of its revenue. This is reflected in its stock's 57.1% surge over the past three months and upward earnings estimate revisions projecting 32.1% YoY growth for 2025. Its premium valuation of 27x forward earnings is supported by a superior 36.4% return on equity and a business model that offers relative insulation from global tariffs. In contrast, Carrier, a global equipment manufacturer, faces a more complex outlook. While it projects a solid 18.4% EPS growth for 2025 and is capitalizing on data center demand, it is simultaneously grappling with significant headwinds, including a $300 million risk from China tariffs, a 35% Q1 decline in light commercial sales, and market weakness in China. Carrier's more modest 25.9% stock gain, lower 23.2x P/E multiple, and Zacks #3 (Hold) rating underscore its position as a stable, dividend-paying (1.2% yield) blue-chip with a more moderate and risk-laden growth trajectory compared to FIX's focused, high-growth narrative.

Key Decisions for Investors

• Investors seeking aggressive growth should consider Comfort Systems (FIX) for its direct exposure to the U.S. technology and industrial buildout, supported by a record $6.9 billion backlog and 32.1% projected EPS growth for 2025.
• For Carrier (CARR), investors should closely monitor its ability to pass through an estimated $300 million in tariff-related costs via pricing without eroding margins or demand, particularly in its residential and light commercial segments.
• Despite FIX's strong fundamentals, its 57.1% stock price increase in three months and 27x forward P/E suggest high expectations are priced in, warranting a disciplined entry point for new capital.
• Income-focused investors may prefer Carrier for its 1.2% dividend yield and stable aftermarket business, but should remain cognizant of its significant exposure to macroeconomic softness in Europe and China, which presents a headwind to growth.