New York County, NY Noise from Specific Sources: HVAC & Mechanical Noise (2026)

Rooftop chillers, window AC units, through wall heat pumps, elevator machine rooms, and restaurant exhaust fans make HVAC one of the most cited categories in Manhattan under the NYC Noise Code. Section 24-232 specifically governs circulation devices and caps their sound contribution at 42 dBA inside a nearby dwelling unit when measured between 10 PM and 7 AM, and 45 dBA during the day. In dense conditions where air shafts and rear yards carry sound vertically between buildings, complaints about neighboring cooling towers and PTAC units are common. DEP inspectors respond to 311 filings, conduct interior measurements with the complainant present, and issue a Notice of Violation plus a directive to submit a Noise Mitigation Plan. Typical remedies include acoustic louvers, spring vibration isolators, duct silencers, variable speed drives that reduce fan RPM overnight, and full acoustic enclosures around rooftop compressors. The NYC Department of Buildings also requires sound attenuation details as part of mechanical plans filed under Construction Codes 2014 Section MC 915. Fines start at 440 dollars.