Pima County, AZ Noise from Specific Sources: HVAC & Mechanical Noise (2026)

Air conditioning is not optional in Pima County, where summer temperatures regularly exceed 100 degrees F for over 100 days per year and can reach 115 degrees F. HVAC equipment runs nearly continuously during summer months, making equipment noise a significant neighborhood concern. Pima County does not set specific decibel limits for residential HVAC equipment in unincorporated areas. General nuisance standards under ARS 13-2916 apply to unreasonably loud equipment. Modern central air conditioning units typically operate at 55-75 dBA at 5 feet, while older units can exceed 80 dBA. Evaporative coolers (swamp coolers), still common in older Pima County homes, are generally quieter than refrigerated air systems. HOA CC&Rs in planned communities frequently regulate HVAC equipment placement, requiring screening walls or setbacks from property lines. Pima County Development Services enforces building code setback requirements for mechanical equipment during new construction and replacements. Rooftop HVAC units common on commercial buildings must meet building code vibration isolation standards. Window AC units in older properties can create concentrated noise toward neighboring properties.