Measuring Air Conditioner Noise
Air conditioner noise is typically measured in decibels (dB). Most split system indoor air conditioners should operate at around 35 dB, equivalent to a quiet conversation, while outdoor units must comply with specific limits at property boundaries. A unit exceeding these benchmarks, especially at night, could breach local regulations and warrant professional attention.
- Whisper: ~20 dB
- Normal conversation: ~60 dB
- Residential ambient: ~40 dB
- Recommended exterior noise limit (at boundary): 5 dB(A) above background noise
NSW Air Conditioner Noise Regulations
In New South Wales, stringent regulations govern the allowable noise levels emitted by air conditioners. Under the Protection of the Environment Operations (Noise Control) Regulation 2017, Section 45, it is an offence to operate an air conditioner such that its noise is heard inside a neighbouring habitable room during prohibited hours. Councils generally enforce a limit of up to 5 dB(A) above the existing background level, measured at the boundary.
Noise Control Regulation Clause 45 requires that any new domestic refrigerated air conditioner (manufactured after 1 March 1986, and under 12 kW capacity) sold in NSW must display a noise label showing its sound power level.
Federal Regulations and Noise Labelling
The Australian Government, through the National Noise Labelling Scheme, and the Department of the Environment and Energy, promotes a unified approach to air conditioner noise standards. The eventual goal is to harmonise state laws so noise labelling applies uniformly across Australia.
Current federal best practice recommends:
- Clear noise labelling of all residential air conditioners showing sound power levels in dB(A).
- Selection and placement of the quietest possible air conditioner, installed as far from any property boundary and neighbouring dwellings as practicable.
Heavier penalties can apply for installing noisy or non-compliant units, and councils may require abatement actions or removal.
How to Reduce Air Conditioner Noise
- Purchase quiet models: Check the noise rating labels on indoor and outdoor sections before buying.
- Professional installation: Use qualified installers to ensure proper mounting, secure ductwork, and isolation from structural vibrations.
- Routine maintenance: Clean or replace air filters and fans regularly, and check compressors or zone motors periodically to avoid noisy operation.
- Appropriate placement: Install units away from adjacent homes, boundaries, and communal areas. Some councils offer specific guidelines on optimal positioning.
- Sound barriers: Landscaping, acoustic screens, and fencing can help deflect and absorb noise before it reaches neighbours.
Dealing With Noise Complaints
If a neighbour raises concerns about air conditioner noise, it’s recommended to:
- Discuss concerns directly and amicably—sometimes simple mediation resolves disputes without escalation.
- Consult local council or EPA officers for guidance and measurements if a resolution cannot be reached.
- Comply with any issued abatement or modification notices promptly to avoid legal penalties or fines.
Penalties for sustained breaches can reach thousands of dollars—$5,000 in some states for individuals and businesses.
Choosing a Compliant Air Conditioner
Homeowners should look for products and installers who provide written assurance of compliance with state and federal air conditioner noise laws. Products must display the required noise rating label and be installed in accordance with council and government standards. Quick tips for a compliant installation:
- Always check noise labels for sound power levels before purchase.
- Install units at least 450mm from boundaries, and away from bedrooms or habitable rooms of neighbouring homes.
- Confirm the unit remains virtually inaudible during restricted hours.
- Keep purchase documentation, installation diagrams, and compliance certificates on file.
Summary: Key Takeaways for Homeowners
- All air conditioners must comply with strict NSW and federal noise limits, especially during evening and night hours.
- Installation location, background noise measurements, equipment choice, and maintenance are crucial for legal and peaceful operation.
- Violations can result in neighbour complaints, council investigations, fines, and removal orders.
- Consumers should always confirm compliance credentials and noise ratings with installers and suppliers.
- Sound labelling is now an important selection factor, with a 5 dB(A) tolerance above ambient noise at boundaries for new units in most jurisdictions.
