Farmington Hills, MI Noise from Specific Sources: HVAC & Mechanical Noise (2026)

Fixed mechanical equipment is treated as any other source under Sec. 17-101 - there is no equipment-specific carve-out in the Sec. 17-101(g) exemption list (which covers only construction per Sec. 18-164, emergency work / snow removal, public-safety warning devices, lawn care 8a-9p, school / playground activities, church bells, unamplified human voice, and public-works projects). HVAC, refrigeration, generator, pool-pump, and similar continuous-cycling equipment must therefore stay under the Sec. 17-101(c) Table A cap at the adjacent property line. The residential nighttime 50 dB(A) cap is the key compliance trigger because typical residential split-system AC condensers produce 55-70 dB(A) at one meter (depending on tonnage and age) and can readily exceed 50 dB(A) at the property line if sited close to the lot line. The Sec. 17-101(e) intermittent / pure-tone clause is especially relevant for HVAC: compressor cycling, fan harmonics, chiller hums, and reverse-alarm beeps are textbook pure-tone or intermittent sources that can be cited even when the broadband meter reading sits below Table A. The four-factor balancing test in Sec. 17-101(e)(1)-(4) considers (1) proximity to sleeping facilities (the classic complaint - a neighbor's condenser five feet from a bedroom window), (2) the nature of the use, (3) time of day, and (4) duration. Sec. 17-101(f) (special exception) is the relief path for legacy equipment: an owner submits a statement of equipment effect on overall area noise plus a background-noise study and predicted boundary-line levels; the Zoning Board of Appeals (sitting as administrative review board) may retain a sound engineer at applicant expense and impose conditions. The Farmington Hills Building Division enforces site-plan setbacks and screening for new mechanical equipment under Chapter 34 (Zoning) and Chapter 7 (Buildings and Building Regulations). Commercial-grade rooftop HVAC at the Twelve Mile / Haggerty corridor R&D campuses, Beaumont Hospital chillers, the Costick Center mechanical yard, and grocery / retail rooftop units along Orchard Lake Road must operate within the business / office 65 dB(A) day / 50 dB(A) night Table A cap measured at the adjacent property line, or - where adjacent to a residential parcel - the more restrictive residential nighttime 50 dB(A) cap. Standby generators (hospital, data center, R&D campus) are not exempt under Sec. 17-101(g) outside actual emergency operation; routine weekly exercise runs must stay under Table A or face citation.