On "How to Solve the Toughest Challenges in Commercial HVAC Retrofits"

Most retrofit advice treats the job like a clean engineering problem when the real nightmare is logistics and coordination on occupied buildings where you can't just shut the system down and rebuild it. Sullivan's probably right that duct leakage and scheduling are the killers, but that's because they're fundamentally about managing stakeholders—facilities teams, tenants, general contractors who don't understand HVAC lead times—not about technique. If you're bidding these jobs, you need contingency for the time you'll spend waiting for access, convincing GCs why you can't run nights and weekends on a live system, and redoing work because the building manager changed their mind about downtime windows. The actual retrofit work is straightforward; the commercial part is what bleeds the margin.