HVAC systems and mechanical equipment in unincorporated LA County must comply with Chapter 12.08 exterior noise standards. Residential HVAC units cannot exceed 50 dBA daytime or 45 dBA nighttime at the neighboring property line.
LA County Code Chapter 12.08 applies exterior noise standards to all stationary noise sources including HVAC systems, air conditioners, heat pumps, and pool equipment in unincorporated areas. Equipment in residential zones (Noise Zone I) must not cause noise levels to exceed 50 dBA daytime or 45 dBA nighttime at the property line. The noise from any single piece of equipment is measured against the applicable zone standard. Section 12.08.430 specifically addresses stationary sources of noise. New HVAC installations should be sited away from neighboring windows and property lines. Sound barriers, vibration isolators, and noise-reducing equipment mountings help achieve compliance. The Department of Public Health Environmental Health Division handles complaints about persistent mechanical equipment noise.
Exceeding noise standards is a misdemeanor under Section 12.08.590, with fines up to $1,000. Property owners may be ordered to abate the noise source through modifications, relocation, or equipment replacement.
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