Now that the Halloween season is firmly over, any bumps, bangs, or boos you hear in your home aren’t likely caused by ghosts. But if the culprit of these uncharacteristic noises is your A/C or heating unit, what’s making them happen, and how can you respond?
Loose & Dirty Parts
Banging, buzzing, clanking, or clicking from inside your unit could be due to a variety of problems, including something as simple as a loose screw or dirt-clogged part. Any loose piston pin, crankshaft, connecting rod, or smaller internal component could also be contributing — or even a poorly balanced internal blower or fan. Clogged copper lines and filters that need to be cleaned could also be in play. In short, there’s a wide range of issues that may be causing unusual noises in your unit. Most of them are likely simple fixes, but all deserve careful investigation.
If you feel comfortable, and know your way around your HVAC unit, give it a general check for these basic issues. Make sure screws are tightened effectively, filters have been replaced, and vent dampers are open. If the culprit feels at all beyond your handy abilities, or the problem persists, call in Mitchell Cooling + Heating for a thorough assessment and safe solution.
Clicking sounds are normal when a system stops and starts, but if they become frequent and persistent, you may be facing a failing thermostat or defective control. Typically, these problems are caused by electrical issues which may be dangerous to your home and costly to repair, so we advise you to involve an expert sooner than later.
Degrading Belts, Fans, and Motors
Brief screeching or squealing that occurs when the unit turns on could mean you’re simply facing a belt that needs replacement.
But squealing sounds through your duct system become more common when indoor blower and outdoor fan motors begin to degrade. Malfunctioning or damaged blower wheels may also be the cause. In general, these are problems best left for an expert’s attention. Call Mitchell Cooling + Heating right away if squealing persists.
Even the most carefully installed, well-sealed ductwork has the potential for leaks along its joints. When air flows through these gaps, it can result in a whistling sound. If you’re unable to patch these leaks yourself, Mitchell Cooling + Heating can quickly identify where and how to reduce the leakage — and the noise.
If you begin to hear a consistent “screaming” or loud, high-pitched whistling noise, a refrigerant leak may be the cause. In some cases, your unit may be equipped with a failsafe sensor mechanism that will automatically shut the unit off when this happens. But when it comes to “screaming” issues, a professional is needed immediately. These problems can be highly detrimental to your AC unit, and may also harm your health, if dangerous chemicals are indeed being released. Schedule an appointment now.
To stay on top of any clicks, knocks, screams, or groans in your system, give the experts at Mitchell Cooling and Heating a call at 770-995-7585. When you’ve investigated a noise and haven’t found a simple answer you can take care of yourself, we’re also available online for appointments and advice.