Manchester, NH Noise from Specific Sources: HVAC & Mechanical Noise (2026)
Key Facts
- Daytime limit (residential)
- 55 dBA, 7 a.m.–10 p.m.
- Nighttime limit (residential)
- 50 dBA, 10 p.m.–7 a.m.
- Measured at
- property line of receiving premises
- First-offense fine
- $100 citation
- Enforcing agency
- Manchester Police Department
Summary
Manchester gives air conditioners, heat pumps, and other fixed mechanical equipment no special exemption: they're held to the city's baseline property-line noise limits, capped at 55 dBA daytime and 50 dBA nighttime for residential sources heard at a residential receptor.
Noise levels shall be measured at any point along the property line or within the property line of the receiving premises to determine compliance of the source... The following table identifies allowable noise levels within various areas throughout the city... Residential [Source, Residential Receptor] 55 [7am-10pm] 50 [10pm-7am]
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2025 S-25: current through Ord. passed 6-3-2025).
Full Breakdown
Manchester's noise chapter exempts specific categories, domestic power equipment (80 dBA), commercial power equipment (88 dBA), snow removal gear, from the base limits, but HVAC units like central AC compressors, heat pumps, and rooftop condensers aren't on that exemption list in § 94.11. That leaves them governed by the general Table A property-line standard in § 94.10: a residential source measured at a residential receptor may not exceed 55 dBA from 7 a.m.–10 p.m. or 50 dBA from 10 p.m.–7 a.m. Commercial and industrial sources get higher allowances (up to 65/80 dBA) but still can't exceed the residential receptor's limit next door. The Chief of Police enforces the chapter.
Violations & Fines
Exceeding the Table A limit at the property line violates § 94.42(C). Fines run $100 first offense, $250 second, $500 third, $1,000 for a fourth or later offense: each day counts as a separate violation.
Frequently Asked Questions
Is there a special decibel allowance for AC units in Manchester?
What's the noise limit for a residential AC unit at night?
Sources & Official References
Other rules in Manchester
Compare Manchester to another location·View the New Hampshire noise from specific sources overview
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HVAC & Mechanical Noise in Nearby Cities
How other cities in this county handle hvac & mechanical noise.