El Dorado County, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)

Section 130.37.040 defines 'Non-Transportation Noise Source' to expressly include 'Heating, Ventilation and Air Conditioning (HVAC) units,' alongside industrial operations, commercial land uses, and outdoor recreation facilities. That classification matters because Section 130.37.030 limits the Chapter's reach: the noise standards apply only to 'noise generating uses requiring discretionary review or ministerial permits,' and carve out 'existing and new single-unit residential dwellings on legal lots' that sit outside an Airport Comprehensive Land Use Plan area. In practice, a homeowner's rooftop or pad-mounted AC condenser on an existing single-family lot is not held to the Chapter's numeric noise table, while a new subdivision, commercial building, or multi-unit project going through discretionary review must show its HVAC and other fixed equipment noise fits within Section 130.37.060's limits.

Where a project's HVAC or other equipment noise is likely to exceed those thresholds near a sensitive receptor such as a home, school, or hospital, Section 130.37.050 requires an acoustic analysis prepared by a qualified acoustic specialist before the County issues a discretionary permit. Section 130.37.070 then directs the project to incorporate noise-reduction measures, which for fixed mechanical equipment commonly means enclosures, setbacks, or acoustic screening, to bring the projected level back under the applicable Table 130.37.060.1 threshold before approval.