Shares of AAON Inc. (NASDAQ: AAON), a leading manufacturer of high-performance HVAC equipment, plummeted 8.10% in pre-market trading on Monday following the release of disappointing second-quarter 2025 financial results and a downward revision of the company's full-year outlook.

The company reported adjusted earnings per share (EPS) of $0.22, significantly missing the analyst consensus estimate of $0.34 by 36.05%. This represents a steep 64.52% decrease from the $0.62 per share earned in the same period last year. AAON's quarterly sales also fell short of expectations, coming in at $311.57 million compared to the estimated $326.13 million, marking a 0.64% year-over-year decline.

AAON's performance was hampered by several factors, including supply chain constraints and operational inefficiencies related to the implementation of a new ERP system. These challenges particularly impacted the AAON Oklahoma segment, which saw an 18.0% decrease in net sales. The company's gross margin also took a hit, falling to 27.5% from 36.1% in the second quarter of 2024. Despite these setbacks, AAON reported strong bookings trends and a 71.9% year-over-year increase in adjusted backlog to $1.12 billion, indicating potential for future growth. However, the company has adjusted its full-year 2025 outlook downward, citing temporary challenges while expressing confidence in its long-term growth prospects driven by increasing demand for its energy-efficient HVAC solutions.