Routine
HVAC Making Loud or Unusual Noise
Banging, squealing, or grinding from your HVAC unit typically means a loose component, worn belt, or failing compressor — all of which worsen quickly if left unaddressed.
How fast can we respond?
Standard request
Within 40h
Submit a request today, we coordinate a vetted provider and confirm your slot.
Request serviceBoh coverage
Zero effort
On coverage, this service is scheduled automatically — before it becomes a problem.
See coverage plansWhat to do
Schedule a service visit with a qualified commercial HVAC technician within the next few days before the issue worsens. Note when the noise occurs, which unit it is coming from, and whether it is constant or intermittent, since that information speeds up diagnosis and reduces labor time on site.
What's causing it
Banging typically points to a loose fan blade, broken motor mount, or debris caught in the unit. Squealing usually means a worn or slipping belt on the blower motor, which is common in high-use commercial systems that run continuously through service. Grinding indicates metal-on-metal contact, often from failing bearings in the motor or compressor. Rattling can also come from loose sheet metal panels or deteriorated vibration isolators shaken apart by the constant mechanical stress of a busy kitchen environment.
What happens if you wait
Ignoring these noises allows small mechanical failures to escalate into compressor replacement or full unit failure, which costs several times more than a belt or bearing repair. A failing HVAC system degrades kitchen air quality, raises ambient temperatures, and puts staff and food safety at risk. If the system serves your makeup air or ventilation, a breakdown can force a service stoppage until it is restored to working order.
LA County Environmental Health requires mechanical ventilation systems to be maintained in good working order, and a failed or degraded HVAC unit can be cited during routine inspection.
How Boh handles it
Boh dispatches a vetted, licensed provider to your location. Every visit is documented — before and after photos, service report, compliance certificate if applicable. You never chase a vendor.
Not sure where to start?
Tell us what's happening and we'll route you to the right provider.