“My highest recommendations for Devon and the Maritime Air team — thorough, honest, and on time. They explained everything in plain language and didn't push any unnecessary upsells.”
Spencer Fuller
May 2026
AC Noise Diagnostics
Banging, Screeching, Buzzing? Here's What Each Noise Means.
The sound your AC makes tells us exactly what's failing. Use this guide to identify the noise, then call us for same-day Treasure Coast diagnostic.
Why Treasure Coast Trusts Us
Reasons Homeowners & Captains Pick Maritime Air Co.
5-Star Rated
Verified Google reviews
Licensed & Insured
Class-A CAC1824400
Family Owned & Operated
Treasure Coast residents
Residential · Commercial · Marine
Full-spectrum HVAC
Written Estimates
Approved before work begins
Photo-Documented Work
Warranties registered for you
Chamber of Commerce
St. Lucie County member
Loud humming + no start
Outdoor unit hums for 10+ seconds but compressor and fan don't spin. Classic capacitor failure — the start winding can't kick the compressor over. $185–$285 repair, takes 30 minutes.
Screeching or squealing
Worn blower or condenser fan motor bearings. Replace the motor before it seizes and burns out the windings. $385–$695 depending on motor type.
Banging or clanking
Loose fan blade hitting the housing, broken compressor mounting bolt, or refrigerant slugging (liquid in the compressor — serious). Shut the system OFF and call us.
Electrical buzzing or sizzling
Failing contactor, loose 240V connection, or arcing relay. Fire hazard — shut the system OFF at the disconnect immediately and call us.
Hissing or bubbling
Refrigerant leak at the indoor coil or line set. Hissing = gas leak; bubbling = liquid leak. Both need EPA-certified repair.
Clicking from indoor unit
Relay chatter from a failing control board, or a thermostat short-cycling the system. We diagnose with a multimeter on the 24V circuit.
Rattling outside
Panels loosened by vibration, debris in the condenser fan, or a failing condenser fan motor. Cheapest possible call — usually $145 total.
Grinding from air handler
Blower wheel touching the housing, bent blade, or motor mount failure. Doesn't fix itself — eventually destroys the motor.
Reviews
What Treasure Coast Customers Say
5.0
37 Google Reviews
Google
“Devon has provided thorough maintenance and excellent service. Truly family-owned care — they treat your home like it's their own. Highly recommend for Treasure Coast homeowners.”
Oh Canada
March 2026
“Working with Devon on my HVAC system was a great experience from start to finish. Fair, clean install, and the system has been running perfectly through Florida summer heat.”
David Alker
February 2026
Our Work
View all projects Example HVAC Scenarios
Real installs and repairs we've completed across the Treasure Coast.
Coil Cleaning
Evaporator Coil Pull & Deep Clean — Port St. Lucie
Port St. Lucie, FL · Residential Split System
Trane Installation
Trane XV20i Installation — Fort Pierce
Fort Pierce, FL · Trane XV20i + TAM9
Trane Installation
Trane XR16 + Heat Pump Installation — Port St. Lucie
Port St. Lucie, FL · Trane XR16
FAQ
Common Questions
Is a loud AC dangerous?+
Some noises (banging, screeching, electrical buzzing) signal failures that can damage the compressor or start a fire if ignored. Turn the system OFF at the thermostat if you smell burning or hear electrical buzzing — then call us.
What noise means my AC compressor is failing?+
A loud hum from the outdoor unit that doesn't start within 10 seconds usually means a failed capacitor or seized compressor. Hard-start clicking followed by silence indicates internal compressor failure.
Why is my AC suddenly louder than normal?+
Common causes: loose fan blade, debris in the condenser, failing motor bearings, refrigerant overcharge, or a panel that's come loose. Most are 30–60 minute repairs once diagnosed.
Sounds bad? Call us — (772) 236-4277.
Call (772) 236-4277 or schedule online. Class-A licensed across the Treasure Coast.