Renovating a Historic Ballroom

In the summer of 2024, AEG undertook a renovation of the Regency Ballroom in San Francisco, including the transformation of its 116-year-old HVAC system—all while keeping the theater operational. The six-story building, originally constructed as a Scottish Rite Temple in 1908, now serves as a commercial theater renowned for its ornate interior and vibrant events. 

Deep beneath the stunning plasterwork lies a piece of history: one of the earliest air handling units ever built, installed just decades after America’s first electric grid. Despite its pioneering status, the system had never been updated.  

AEG’s ambitious vision was clear: design an HVAC system capable of serving a 1,350-seat theater, align with San Francisco’s climate goals, preserving the building’s historic integrity, while always being mindful of the cost effectiveness of decision.

The project team rose to the challenge, leveraging the bones of the original system to deliver a solution that preserves the past while advancing zero net energy goals. This renovation demonstrates how historic buildings can play a vital role in the transition to a sustainable future without sacrificing their character.