Sonoma, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)
Key Facts
- HVAC classed as
- 'constant' noise under Section 9.56.020(D)
- Residential daytime limit
- 50 dBA constant
- Residential nighttime limit
- 40 dBA constant
- Commercial limit
- 55 dBA constant
- Enforced as
- infraction or misdemeanor
Summary
Sonoma Municipal Code Section 9.56.020(D) singles out air conditioners as an example of 'constant noise,' the category subject to the strictest limits in the city's noise chapter. On residential property, an air conditioner or other HVAC unit may not exceed 50 dBA in the daytime or 40 dBA at night.
D. “Constant” noise means a continuous noise produced where there is no noticeable change in the level of the noise source. Examples would include such noises as those associated with air conditioners and pool equipment. ... 9.56.040 General noise limits. ... ... A. Residential Property Noise Limits. 1. No person shall produce, suffer or allow to be produced by any machine, animal or device, or by any other means, a noise level greater than the following, when measured on any residential property:
+---------------+---------------------+ | a. Daytime: | 60 dBA intermittent | +---------------+---------------------+ | | 50 dBA constant | +---------------+---------------------+ | b. Nighttime: | 50 dBA intermittent | +---------------+---------------------+ | | 40 dBA constant | +---------------+---------------------+
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 13-2025, passed December 3, 2025).
Full Breakdown
56, does not have a section devoted solely to HVAC equipment, but its definitions and limits reach it directly. 020(D) defines 'constant' noise as a continuous noise with no noticeable change in level, and it specifically lists air conditioners and pool equipment as examples. m. m. Friday and Saturday, and no more than 40 dBA at night. On mixed-use property the residential-adjacent constant limits rise to 55 dBA daytime and 45 dBA nighttime, and on commercial property the limit is 55 dBA constant unless a use permit specifically authorizes more.
All levels are measured with an ANSI-compliant sound level meter at any point on the receiving property, using the average (Leq) reading for constant sources. 030, which bars any noise raucous or nerve-wracking enough to disturb the peace regardless of whether it stays under the numeric limit. 100.
Violations & Fines
A property owner or resident whose air conditioner or other constant-noise equipment exceeds 50 dBA daytime or 40 dBA nighttime on neighboring residential property is subject to enforcement under Section 9.56.100, chargeable as either an infraction or a misdemeanor, independent of any remedy available under state nuisance law.
Frequently Asked Questions
How loud can my air conditioner legally be in the City of Sonoma?
Are air conditioners specifically named in Sonoma's noise code?
Is there an exception for HVAC equipment installed before the noise limits took effect?
Sources & Official References
Other rules in Sonoma
California rules heatmap·Compare Sonoma to another location·View the California noise from specific sources overview
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HVAC & Mechanical Noise in Nearby Cities
How other cities in Sonoma County handle hvac & mechanical noise.