Your heating and air conditioning system is a well-tuned machine. You shouldn’t notice it is running when it is working properly. If you do notice unusual sounds, it indicates something is wrong with your HVAC equipment. When this happens, you should reach out to one of our technicians right away to get the underlying problem diagnosed and repaired.
What Are Common HVAC Noises?
At Coffman & Company, we have experience helping Arvada and greater Denver area residents with common heating and cooling issues. We’ve handled all types of repairs, maintenance, and installations for air conditioners, furnaces, and heat pumps, so we know how to diagnose unusual noises and make repairs.
As a general rule, your HVAC system should never make any weird noises. If you notice some of the following sounds, you should immediately get professional HVAC assistance.
Buzzing
Often, buzzing noises indicate an electrical issue, compressor malfunction, or a loose part. None of these issues should be repaired on your own.
Humming
Humming sounds can stem from electrical issues or loose components. Because electrical problems can lead to a fire, getting professional help immediately is essential. If the sound is accompanied by a burning smell, you should turn off the system and call for repairs.
Clicking
It’s normal for an HVAC system to make clicking noises when it initially turns on. However, you should never notice continued clicking sounds. Ongoing clicking noises may mean you have a faulty relay or a failing thermostat.
Whistling
If you notice a whistling noise, it most likely comes from the air ducts. When the airflow is restricted, it can produce a whistling sound. There may be a blockage in your ductwork that is causing the noise. Alternatively, there may be a small hole in the ducts, which allows conditioned air to escape and make a whistling sound.
Clanking
A rattling or clanking noise is often related to the furnace’s blower assembly or the blower motor. It’s also possible that the connecting rod, crankshaft, or piston pin is loose. All of these issues require a professional inspection and repair.
Buzzing
You may notice a buzzing sound if your capacitor is failing. Normally, the capacitor is responsible for storing electrical energy so that the power can be used to start your air conditioner. Because this stored energy can cause electrical shocks, the capacitor should never be handled by anyone other than a trained professional.
Hissing
If your HVAC system makes a hissing noise, it typically means that refrigerant is escaping from your refrigerant lines. Because refrigerants are hazardous to the environment and your family’s health, it’s important to turn off your HVAC system and get professional help right away. Once the leak has been repaired, the HVAC technician can recharge your system.
Banging
A banging noise is another issue that is likely connected to loose parts. However, you may also notice a banging or popping noise in your ductwork because of temperature changes. Pay attention to where the sound is. If it’s coming from the indoor or outdoor unit, it likely requires professional service.
Grinding
Grinding noises can come from faulty motor bearings or a failing blower motor. A part within your HVAC system is most likely worn down, so it’s grinding against other parts. This can eventually cause other components to fail, so it’s better to deal with this issue immediately.
How to Deal With HVAC Noises
If you’re experiencing HVAC issues, you can troubleshoot by performing some simple HVAC maintenance. For example, your air filter should be changed or cleaned every 30 to 90 days. Additionally, you should regularly remove any plants or debris within 3 feet of your outdoor air conditioning or heat pump unit.
Good maintenance can help you prevent future repairs. However, even the best maintenance won’t prevent every repair issue. As HVAC systems age, they are more likely to have faulty components and other problems. When this happens, the best thing you can do is call for help. Our professional HVAC technicians can diagnose the problem and recommend the best solution. You can prevent HVAC issues from snowballing and causing major breakdowns by repairing them as soon as possible.
Get Help With Unusual HVAC Sounds
If you’re hearing an unusual noise from your HVAC system, we can help. Coffman & Company has assisted Denver residents with HVAC problems for over 20 years. Our family-owned company works with heating and cooling systems, including ductless systems, evaporative coolers, and heat pumps. We also offer services for water heaters, gas lines, and indoor air quality. To learn more about our services, contact our team of experienced professionals today.
