Murrieta, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)

Residential and commercial HVAC equipment in Murrieta must operate within MMC 9.02 noise limits measured at the receiving property line. Standard residential limits are 55 dBA daytime (7 AM to 10 PM) and 45 dBA at night (10 PM to 7 AM). Most modern residential split-system condensers operate between 55 and 75 dB at close range, so placement relative to neighboring property lines matters. The Murrieta Development Code requires minimum setbacks for HVAC units (typically 3 to 5 feet from side property lines) and may require sound attenuation walls or enclosures in higher-density zones. Pool equipment, including pumps and heaters, is considered alongside HVAC for noise compliance. Neighbors complaining about noisy HVAC can request a sound level measurement by Code Enforcement; readings exceeding the limit trigger a notice to the owner requiring mitigation such as adding barriers, relocating equipment, or replacing with quieter models. Commercial rooftop HVAC units typically require acoustic screening per Development Code conditions of approval.