Rock Energy Systems

Rock Energy Systems

Rock Energy Systems traces its founding to 1976 and is now a WILsquare Capital portfolio company, operating as a single-family office structure. The firm's wealth originates from decades of designing and distributing waste oil heating systems and industrial airflow products. The firm's product platform spans five brands: Clean Burn, Lanair, EnergyLogic, SunFire, and Air Movement Solutions. These serve industrial, commercial, and agricultural customers across North America. Product lines include portable radiant heaters, waste oil furnaces, High-Volume Low-Speed (HVLS) fans, waste oil boilers, and used oil recycling centers. SunFire is marketed as the only commercial-grade heater brand made in the USA. Rock Energy Systems is headquartered in Janesville, Wisconsin, and operates with a nationwide network of distributors. The firm does not publicly disclose AUM, total deployment, or number of professionals. No recent operational events from the last 24 months have been publicly reported. The firm's structural differentiator lies in its ownership architecture: it is a single-family office embedded within a manufacturing holding company (WILsquare Capital), blending industrial operations with wealth management. This hybrid model—where the family office owns and operates industrial brands rather than relying solely on financial investments—is distinct from traditional single-family offices.