Lafayette, LA Noise from Specific Sources: HVAC & Mechanical Noise (2026)
Key Facts
- Governing section
- § 34-366(d)
- Tonal noise reduction
- Table I limit minus 5 dB(A)
- Residential HVAC night cap
- 55 dB(A) hard limit
- Named sources
- HVAC units, refrigeration units, transformers
- Tolerance
- ±3 dB fluctuation allowed
- Minor-violation window
- Up to 30 days to correct
Summary
Lafayette treats HVAC units, refrigeration equipment, and transformers as 'steady pure tone' noise sources under City-Parish Code § 34-366(d): mechanical devices emitting a whine, hum or buzz. Their Table I decibel ceiling drops by 5 dB(A) versus ordinary sound, and residential HVAC specifically can't exceed 55 dB(A) at night.
Steady pure tones. If the sound source under investigation is a mechanical device, and is, in the investigating officer's opinion, emitting a sound with a steady tonal quality, the permissible sound level limits in Table I shall be reduced by five dB(A). The sound emissions must be comprised of a single frequency or a narrow cluster of frequencies, which may be referred to as a whine, hum or buzz. The measured sound levels of such a source must not fluctuate by more than plus or minus three dB. Such sound sources include, but are not limited to: heating, ventilating or air-conditioning units; refrigeration units; and transformers. Nothing to the contrary withstanding, sound sources from residential heating, ventilating or air conditioning units can not exceed 55 dB(A) at night.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 65).
Full Breakdown
Section 34-366(d) singles out 'steady pure tones', sound from a mechanical device that a noise control officer determines has a steady tonal quality, meaning it's dominated by a single frequency or a narrow cluster of frequencies (described in the code as a whine, hum, or buzz) and doesn't fluctuate by more than plus or minus three decibels. Heating, ventilating and air-conditioning units, refrigeration units, and transformers are named examples. 00 dB(A). The code then adds a hard floor specific to housing: residential HVAC sound sources can't exceed 55 dB(A) at night no matter how the tonal-reduction math works out.
Measurement is taken by a noise control officer with a sound level meter at or within the property line of the receiving property, per § 34-366(a) and § 34-367. is exposed to enforcement, and a repeat offense in the prior 12 months forecloses the minor-violation correction period under § 34-370(a)(2).
Violations & Fines
Exceeding the steady-tone limit is enforced the same way as any § 34-366 violation: a first-time, non-willful HVAC noise complaint is treated as minor, giving the owner up to 30 days (extendable to 180) to fix or muffle the unit under § 34-370(b). A repeat violation within 12 months, or a willful refusal to correct, becomes a major violation punishable under § 1-9 with a minimum $150.00 fine.
Frequently Asked Questions
Does my AC unit have to meet a stricter noise limit than other sound sources?
What if my system fluctuates in volume: does the tonal rule still apply?
How long do I have to fix a noisy HVAC unit after a complaint?
Sources & Official References
Other rules in Lafayette
Compare Lafayette to another location·View the Louisiana noise from specific sources overview
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