Norwalk, CT Noise from Specific Sources: HVAC & Mechanical Noise (2026)
Key Facts
- Nighttime HVAC limit
- 50 dBA at property line
- General residential nighttime limit
- 45 dBA outdoors, 35 dBA indoors
- Nighttime Hours
- 8 p.m.-7 a.m. weeknights
- Enforcing official
- Noise Control Administrator
- First fine
- $50, rising to $250
Summary
Norwalk caps nighttime noise from residential HVAC equipment, air conditioners, heat pumps and condenser units, at 50 dBA, a specific carve-out from the general 45 dBA outdoor residential nighttime ceiling in the noise ordinance's Table 1. The Noise Control Administrator measures compliance at the property line.
Notwithstanding the Sound Level limits found in Table 1, the permissible Sound Level limit for residential HVAC equipment during Nighttime Hours shall be 50 dBA when measured as specified in § 68-4C.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4888624; v55 updated 2026-05-26; through 05-26-2026).
Full Breakdown
m. m. m. m. m. Sunday, with Saturday hours applying on state and federal holidays. Subsection C(10) overrides that general figure specifically for residential HVAC equipment, allowing 50 dBA at night instead of 45 dBA, recognizing that compressors and condenser units run continuously and cannot always meet the tighter residential cap. Compliance is measured under the procedures in § 68-4C, Sound Level measurement procedures, at or within the property line of the receiving property, using a sound level meter and the chapter's Corrected Source Sound Level calculation that subtracts ambient noise from the total measured level.
The Noise Control Administrator enforces the chapter and may inspect premises, take measurements, and issue violations. A property owner whose HVAC unit exceeds 50 dBA at night can apply to the Director of Health under § 68-11 for a variance if compliance would impose an unreasonable hardship, but the variance process requires published notice to abutters and a hearing.
Violations & Fines
First violation of the HVAC nighttime limit draws a $50 fine, a second violation within 30 days of the first is $100, and each further violation is $250 under § 68-10. Each day the excess noise continues is a separate offense, and the Noise Control Administrator issues the citations.
Frequently Asked Questions
How loud can my AC or heat pump be at night in Norwalk?
Who measures HVAC noise complaints in Norwalk?
Can I get relief if my HVAC unit can't meet 50 dBA?
Sources & Official References
Other rules in Norwalk
Compare Norwalk to another location·View the Connecticut noise from specific sources overview
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