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

NYC Administrative Code §24-227 regulates noise from circulation devices including HVAC systems, air conditioners, fans, and ventilation equipment. When the ambient sound level is at or below 42 dB(A), the sound from a single HVAC device may not exceed 42 dB(A) as measured inside the receiving residential unit. When ambient levels exceed 42 dB(A), the device may not add more than 4 dB(A) above the existing ambient level. Buildings with multiple HVAC units face a cumulative limit of 45 dB(A). Window air conditioning units are subject to the same standards. DEP enforces these limits through complaint-driven inspections using calibrated sound meters. Complaints are filed through NYC 311. Building owners are responsible for ensuring that rooftop and building-mounted HVAC equipment complies with the noise code. New HVAC installations require acoustic analysis as part of the DOB permit process. After-hours noise (10 PM to 7 AM) that exceeds 7 dB(A) above ambient at a receiving property is considered unreasonable under §24-218.