Philadelphia, PA Noise from Specific Sources: HVAC & Mechanical Noise (2026)

Section 10-403(2) caps sound from a residential property at 3 decibels above background level, or audibility beyond 100 feet of the property boundary, but subsection (2)(b) carves out a separate, more permissive standard specifically for sound originating from an air conditioning or refrigeration unit or system. Under that carve-out, an HVAC or refrigeration unit's sound may not exceed 5 decibels above background level measured at the property boundary of the nearest occupied residential property, or 10 decibels above background level measured at the property boundary of the nearest occupied non-residential property.

That is the same two-tier standard Section 10-403(3) applies to ordinary non-residential noise sources, putting a residential property's air conditioner on the commercial noise scale instead of the tighter 3-decibel residential baseline. The Department of Public Health enforces the limit through Section 10-405, which authorizes inspectors to enter and measure sound from any installation and to require the owner to provide assistance obtaining normal operating conditions during measurement; the Department can also order a noisy unit's owner to submit test results from professionally competent personnel within 10 days of testing.

Section 10-406 sets the penalty at $100-$300 for a first violation, escalating to $200-$400, $300-$500, and $500-$700 for a second, third, and fourth-or-later violation within 12 months, with each day of a continuing violation billed as a separate offense. An owner served with a compliance order can request a hearing before the Health Commissioner within five days under Section 10-409(5), and compliance isn't required while that appeal is pending unless the Department certifies immediate action is needed to protect public health.