Case Study: Comfort Systems USA achieves BEC protection and streamlined acquisitions with Abnormal AI

Comfort Systems USA Builds Its Business More Securely with Abnormal

Comfort Systems USA, one of North America’s largest mechanical contractors with 15,000+ employees and 12,000+ protected mailboxes, needed to secure and quickly integrate multiple email platforms as it grew through acquisitions. Native Microsoft 365 protections and a SEG were insufficient against sophisticated business email compromise and account takeover attempts, so Comfort Systems USA turned to Abnormal AI and its Inbound Email Security, Email Account Takeover Protection, and Email Productivity offerings, leveraging AI/ML to detect anomalies across new vendor and customer workflows.

Abnormal AI complemented the company’s existing stack with an API-based, anomaly-detection approach that reduced false positives, sped investigations, and integrated telemetry with CrowdStrike for automated remediation. In 90 days Abnormal AI blocked 813 BEC attacks, identified 249 high-risk vendor email accounts during integration, and saved the security team about 62 hours per month on manual remediation, enabling faster, more reliable protection as Comfort Systems USA continues to acquire and integrate businesses.

Comfort Systems USA

Christopher Chambers

VP of Information Security