The Hum That Never Stops: How to Deal with Noise from HVAC and AC Units

Why is Mechanical Noise Different?

Noise from equipment like an AC unit is fundamentally different from a neighbor's stereo. The issue isn't a person's choice, but a property's condition. The sound is often:

• Constant: It doesn't stop, which can be more disruptive to sleep and concentration than intermittent noise.
• Low-Frequency: The humming or vibrating sound travels easily through walls and structures, making it difficult to block.
• A Maintenance Issue: Often, excessive noise is a sign that the equipment is old, in need of repair, or was improperly installed (e.g., not placed on vibration-dampening pads).

Check Your Ordinance for 'Mechanical Equipment' Rules

Because this is such a common issue, many city ordinances have sections dedicated specifically to "stationary mechanical equipment." These rules are often more objective than general nuisance clauses. Look for:

• Specific Decibel Limits: Ordinances often set a clear dB(A) limit for this type of equipment, measured at the property line. A common limit for residential areas is around 50-55 dB(A).
• Time-of-Day Restrictions: While some equipment needs to run 24/7, rules for things like pool pumps may be restricted to daytime hours.
• State of Good Repair: Many codes include a clause stating that all equipment must be kept in a state of good repair to prevent excessive or unusual noise.

Your Step-by-Step Action Plan

Resolving mechanical noise requires a systematic approach focused on getting the property owner to take responsibility for their equipment.

1. Pinpoint the Source: Identify exactly where the noise is coming from. Is it your next-door neighbor's window AC unit? The large HVAC system on the roof of your apartment building? A pool pump in a neighbor's yard?
2. Document the Noise: Keep a detailed log of when the noise is audible and how it impacts you. A video recording is especially helpful here, as it can capture the sound and its source simultaneously. You can also use our Decibel Meter to get an approximate reading.
3. Contact the Right Person (in Writing):
   • If it's a neighbor's equipment: Start with a polite conversation. They may be unaware. If that fails, send a formal letter explaining the issue and referencing the ordinance.
   • If you're a renter: Immediately contact your landlord or property manager in writing. This is a maintenance issue and a potential breach of your "quiet enjoyment." They are responsible for servicing building equipment or addressing another tenant's faulty unit.
   • If you're in an HOA: Report the issue to the HOA board. They can enforce community maintenance standards.
4. File a Complaint with Code Enforcement: If the responsible party fails to act, file a formal complaint with your city's code enforcement department. Provide them with your detailed log and recordings. They can inspect the equipment and issue a notice of violation to the property owner, compelling them to make repairs.

The Takeaway

You don't have to live with a constant, maddening hum. Mechanical noise is a property maintenance issue, not a personal dispute. By systematically documenting the problem and contacting the responsible owner or manager in writing, you can effectively escalate the issue until the necessary repairs are made, restoring peace and quiet to your home.