Moorpark, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)

070, Moorpark's noise 'Prohibited acts' section, makes it unlawful to operate or permit the operation of any air-conditioning or air-handling equipment in a residential area in a manner that exceeds the sound levels in Table 3. That table sets three measurement points and two eras of equipment: at any point on the neighboring property line, 5 feet above grade and no closer than 3 feet from any wall, units installed before January 1, 1980 are capped at 60 dB(A) and newer units at 55 dB(A); at the center of the neighboring patio, the limits drop to 55 and 50 dB(A); and outside the neighboring living-area window nearest the equipment, the same 55 and 50 dB(A) figures apply.

These are absolute ceilings, unlike the time-weighted approach used in Moorpark's Table 4 exterior land-use noise standards. 040(F), the development-standards chapter's mechanical equipment provision, backs up the noise cap with a physical siting rule: ground-mounted mechanical equipment, including heating and air conditioning units, must be completely screened from surrounding properties by a wall or fence, or enclosed within a building, with the screening plans approved by both the community development director and the building official. 025(A)(7)(g) requires heating and cooling equipment on a residential lot to sit at least 3 feet from any side or rear lot line and to be screened from public view.

030. Homeowners with older HVAC units face a higher allowable ceiling (60 dB(A)) than anyone installing new equipment (55 dB(A)), a built-in incentive to upgrade to quieter systems.