One Step at a Time: David Ellner’s Blueprint for Large-Scale HVAC Efficiency

This episode of SF Commercial Property Conversations with Bruce Bean dives deep into the complex world of modernizing HVAC systems in large-scale commercial buildings with engineering veteran David Ellner. With over 45 years of experience, David shares how he acts as an owner’s representative, project manager, and commissioning agent—often all at once—to ensure outdated building systems get seamlessly upgraded for performance, efficiency, and sustainability.

What You’ll Learn in This Episode:

• Why aging buildings (some over 60 years old) can benefit from modernization—even if they’re fully occupied

• How modern HVAC retrofits are executed with minimal disruption

• The surprising challenges of replacing rooftop units, including structural and visual code hurdles

• How AI and smart controls are slowly transforming building system operations

• The importance of having someone who can "translate" between engineers and building owners

• What building owners often miss—and how David helps avoid costly mistakes

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