Riverside County, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)
Key Facts
- Rule
- Heating/AC equipment exempt from noise code
- Governing section
- Riverside County Code § 9.52.020(L)
- Otherwise-applicable limit
- 55 dBA day / 45 dBA night (residential)
- Distinguished from
- Power tools standard, § 9.52.060(B)
- Enforcement
- Sheriff & code enforcement have no basis to act
- Adopted
- Ordinance No. 847, 2006
Summary
Riverside County's noise ordinance exempts heating and air conditioning equipment outright from the decibel limits and nighttime curfews in Chapter 9.52. Section 9.52.020(L) lists 'heating and air conditioning equipment' among sixteen categories of sound the chapter never regulates, so an HVAC unit's operating noise cannot be cited under the county's Table 1 sound-level standards no matter how loud or how late it runs.
Sound emanating from the following sources is exempt from the provisions of this chapter: ... K.Motor vehicles, other than off-highway vehicles. This exemption does not include sound emanating from motor vehicle sound systems;L.Heating and air conditioning equipment;M.Safety, warning and alarm devices, including, but not limited to, house and car alarms, and other warning devices that are designed to protect the public health, safety, and welfare;N.The discharge of firearms consistent with all state laws.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 84 Update 1).
Full Breakdown
52, enacted by Ordinance No. and 45 dBA overnight, with commercial and industrial ceilings running from 65 to 75 dBA. 020 exempts sixteen categories of sound from those limits and from every other requirement in the chapter, and subsection L is simply 'Heating and air conditioning equipment,' with no qualifying language limiting the exemption by size, age, decibel output or time of day. and at no more than 100 feet away otherwise. 080, the sheriff and code enforcement, have no basis to act on HVAC noise complaints under this chapter alone.
The exemption is chapter-wide and applies equally across unincorporated communities; it does not extend into the county's 28 incorporated cities, such as Temecula, Murrieta or Riverside, which regulate mechanical equipment noise, if at all, under their own municipal codes.
Violations & Fines
HVAC operating noise, standing alone, is not chargeable under Chapter 9.52: Section 9.52.020(L)'s exemption means it cannot trigger the escalating fines of $500 for a first infraction, $750 for a second, or up to $1,000 and six months in jail for a misdemeanor that Section 9.52.100 sets for other chapter violations. A complaint about a specific installation is more likely to be handled, if at all, as a zoning setback or equipment-placement issue under Title 17 rather than as noise.
Frequently Asked Questions
Can I complain about a neighbor's noisy AC unit under the county noise ordinance?
What decibel limit applies to other backyard noise if HVAC is exempt?
Is a loud commercial rooftop AC unit treated differently from a home unit?
Sources & Official References
Other rules in Riverside County
California rules heatmap·Compare Riverside County to another location·View the California noise from specific sources overview
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