Comfort Systems vs. AECOM: Which Construction Stock to Pick?

Comfort Systems USA (FIX) is favored over AECOM (ACM) as a construction sector investment, despite both benefiting from robust infrastructure demand and the Federal Reserve's September 2025 rate cut. FIX demonstrated strong momentum with a record $8.12 billion backlog and projected 2025 EPS growth of 52.4%, significantly outperforming ACM's 15.9%, alongside a superior 39.33% ROE. While ACM's $24.59 billion backlog is driven by global infrastructure projects, its exposure to government funding and international regulatory risks contrasts with FIX's strategic acquisitions and focus on margin expansion, positioning FIX as a Zacks #1 Strong Buy.

Analysis

The construction and engineering sector is experiencing significant tailwinds from global infrastructure spending and a more accommodative monetary policy, evidenced by the Federal Reserve's recent 0.25% rate cut in September 2025. Within this favorable environment, Comfort Systems USA (FIX) and AECOM (ACM) present divergent investment profiles. FIX demonstrates superior operational momentum and financial performance, with its backlog surging to a record $8.12 billion from $5.77 billion a year prior. This is complemented by a projected 2025 EPS growth of 52.4% and an exceptional trailing 12-month ROE of 39.33%. The company's growth is further supported by an accretive M&A strategy, including the recent acquisition of Right Way Plumbing, which is expected to contribute $60-$70 million in annual revenue, and a shareholder-friendly dividend increase. In contrast, AECOM, while benefiting from a large $24.59 billion backlog driven by international government projects, shows more moderate growth, with a 5% year-over-year backlog increase and a projected fiscal 2025 EPS growth of 15.9%. Its ROE of 27.87% is healthy but significantly lower than FIX's. Furthermore, AECOM's heavy reliance on government contracts and international exposure introduces considerable risks related to funding declines and geopolitical policy shifts. Consequently, FIX trades at a premium valuation reflecting its strong growth and execution, while ACM offers a discounted valuation that accounts for its slower growth and higher risk profile.

Key Decisions for Investors

• Given Comfort Systems' (FIX) superior EPS growth forecast of 52.4%, robust backlog momentum, and higher ROE of 39.33%, investors should consider it a primary candidate for a long position to gain exposure to the strong infrastructure cycle, despite its premium valuation.
• For AECOM (ACM), its discounted valuation and exposure to global infrastructure trends may appeal to value-oriented investors, however, any position should be sized with caution due to its significant dependence on government funding and vulnerability to international regulatory risks.
• Consider a pairs trade strategy of long FIX and short ACM to capitalize on the clear divergence in growth trajectory and operational efficiency while hedging against sector-wide risks.
• Investors should closely monitor future Federal Reserve communications, as the article's noted optimism for two additional rate cuts in 2025 represents a key catalyst that could further de-risk project financing and boost valuations across the sector.