The sounds your heater or air conditioner makes can indicate whether or not it is functioning normally. Unusual or loud noises may tell you that the unit needs servicing. Let’s take a look at some of the reasons why your HVAC system could be making a rattling, banging, whooshing, or screeching sound while it runs.
Loose Parts
When parts like screws and bolts come loose, they can rattle around in your unit and make loud noises. You need to tighten or replace them so your system runs quieter. Loose parts can quickly come undone and compromise your entire system.
Debris
Your HVAC unit can also make noise because of debris caught inside it. This debris can include leaves and twigs, as well as dirt and grass clippings. It’s important that the entire system be clear of debris and blockages.
Dirty Filters
Clogged filters not only cause your system to work harder and blow out dirty or dusty air but also cause it to make noises like wheezing or squealing. Check if your filter is dirty and replace it with a fresh one.
Refrigerant Leak
A refrigerant leak in the air conditioner can lead to your HVAC system making hissing or bubbling noises. A refrigerant leak requires prompt, professional air conditioning repairs.
Fan Issues
A damaged or malfunctioning fan can cause noises like rattling or vibrating. You can get a quieter HVAC unit by lubricating the fan motor or replacing the entire fan if needed.
Loose or Damaged Ducts
Cracks and punctures in the ductwork let in air and can lead to whistling noises. Likewise, you might hear noises like flapping or rattling when the ducts come loose as air rushes through them.
Compressor Issues
When the air compressor stops working normally, the HVAC unit can begin to make excessive noise. These sounds can include banging or clanking while you have the air conditioner or heater running. A broken compressor is a major issue.
Belt Problems
Squealing or screeching sounds can indicate a problem with one of the belts in your HVAC unit. Belts can fray, break or come loose. You must hire an HVAC technician to replace the belts and help your system function quieter.
Electrical Issues
Your heating and cooling system can develop various electrical issues that contribute to unusual and excessive noises. These problems can include faulty or damaged wiring or a malfunctioning ignition switch.
Obstructions in the Vents
Obstructions like clogs or foreign objects in the unit’s vents can lead to whistling or hissing sounds. You can avoid these noises by having your vents professionally cleaned at least every few years.
Metal Duct Expansion and Contraction
When the HVAC unit’s metal ducts expand and contract because of temperature changes, you might hear the system make loud popping noises. Some of this might be normal, but if it’s excessive, you want to get it checked.
Improper HVAC Installation
Improper installation of your HVAC system can contribute to it making excessive noises like thumping, rattling, or grinding. These sounds can range from vibrating to banging and require a professional HVAC technician to reinstall the unit.
Lack of Yearly Maintenance
Yearly maintenance of your HVAC system helps it operate normally and reduces the chances of it making so much noise. An HVAC technician keeping everything lubricated and tight goes a long way toward preventing this and ensuring your system lasts the test of time.
High System Pressure
High pressure in the system can cause it to make a loud high-pitched whistling noise. Preventative measures like sealing the ducts and cleaning the vents help prevent pressure buildup.
Fan Blade Damage
Dented or damaged fan blades can also contribute to your system making alarming noises like clanging or ringing. Damaged or dented blades require professional HVAC repairs.
Unbalanced System
Quiet HVAC operation requires the system to remain balanced to distribute air evenly throughout it. An unbalanced system can cause the ducts to rattle and vents to whistle. Yearly HVAC maintenance for your AC and heater can include having the technician balance the system.
Thermostat Problems
When the thermostat in your unit starts to malfunction, you might hear it click, hum or buzz. These distinct sounds can come from loose wiring or damaged wiring in the thermostat.
Water Leaks
Water leaks can cause water to drip on the electrical components in the unit, leading to sounds like sizzling or hissing. A water leak can occur because of a clogged drain or frozen coils.
Age
Older HVAC systems can make more noise than newer units. Some of the noises older units make can include banging or crashing, either from the unit itself or from the ductwork.
Our team at Brisk Air uses the latest technology to service your home’s HVAC system. We also provide products from leading home service brands like Lennox, Amana and Mitsubishi for our customers in the Coral Springs, FL area and install, repair, and maintain all aspects of a home’s HVAC system. We also offer air duct services and guarantee our work. Contact us to learn about our HVAC services!
