NYC Noise Code §24-227 sets strict decibel limits for HVAC and circulation devices: 42 dB(A) measured inside a neighboring dwelling. Outdoor units near residences cannot exceed 7 dB(A) above ambient.
NYC Administrative Code §24-227 governs noise from 'circulation devices' — air conditioners, fans, compressors, chillers, and HVAC equipment. Indoors at a receiving dwelling, the sound level from another unit's device cannot exceed 42 dB(A). For outdoor installations, a device must not raise ambient sound by more than 7 dB(A) during the day or 3 dB(A) at night as measured at the property line or receiving building. Building-mounted chillers and rooftop units common in Brooklyn commercial strips and mixed-use buildings must be baffled and serviced to meet these standards. DEP investigates 311 HVAC complaints, typically with a field decibel measurement. Installers must comply at the design stage. Older PTAC units and illegally installed condensers on fire escapes are common violation sources. Repeat violations can trigger DEP notices of violation adjudicated at OATH.
§24-227 violation: $75 first offense, up to $525 for repeat residential; commercial violations up to $8,000 under §24-257.
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