A furnace that’s working correctly shouldn’t make much noise. So, if you suddenly start hearing a humming noise from your furnace, it’s a cause for concern. Although there are many potential causes for the noise, it’s best to get it checked out by a professional to make sure everything is in order. In this blog post, we’ll explain what causes a furnace to hum and what you should do if yours is humming too loudly.

1. Failing Blower Motor

One potential cause is that the blower motor has malfunctioned. The blower motor is responsible for circulating air through the furnace and into your ductwork. The furnace humming noise can be caused by the blower motor not being properly balanced and could be starting to fail. When the blower motor is unbalanced, it can cause the furnace to vibrate and make a humming noise. A heating expert may be able to fix this problem by adjusting the screws on the motor until the vibration stops.

Another potential cause of furnace humming is that the bearings in the blower motor are worn out. Worn-out bearings can cause the motor to make a grinding or humming noise. If this is the case, you’ll need to replace the bearings.

2. Fan Blades Malfunction

A furnace humming noise can also be caused by the fan blades hitting something inside the furnace or something getting caught up in the blades. If the fan blades are not turning properly, they can create a humming noise and will not push the air properly through the furnace and into your home. This could be caused by a buildup of dust or debris on the blades or something else inside the furnace blocking the blades from spinning freely. If the blades are not properly aligned, they can create a humming noise as they spin.

In addition to making a humming noise, the furnace may also vibrate or shake. This can cause wear and tear on the rest of the furnace and make it more difficult to heat your home. If you notice that your furnace is making a humming noise, it’s essential to have it checked out by our professionals. They will be able to diagnose the problem and make any necessary repairs.

3. The Ductwork Is Blocked or Restricted

If there is insufficient airflow, the furnace will have to work harder to circulate air, which can cause it to hum. Over time, dust and debris can build up in the ducts, narrowing the opening and causing the air to become trapped. This can create a humming or whistling sound as the air tries to escape. These blockages can also cause the furnace to overheat, damaging the unit and leading to a fire hazard.

Humming can also happen if the ducts are not properly insulated or if they are damaged in some way. As a result, the airflow is reduced, and the furnace has to work harder to circulate air throughout the home. If you suspect that this is the problem, it’s crucial to have an expert take a look at your furnace as soon as possible. Otherwise, you could end up damaging your furnace or causing other issues with your HVAC system.

4. Electrical Current in Your Transformer

The transformer is responsible for converting the electricity from your power source into the proper voltage for your furnace. If the transformer is not working correctly, it can cause a humming noise. The motor produces the noise when it isn’t receiving enough power. Another possibility is that the fan belt may be loose or worn out and needs to be replaced. As a result, this may cause the motor to produce a humming noise.

5. Furnace Is Too Old

If you’re noticing a furnace humming noise that wasn’t there before, it could be because your furnace is too old. As furnaces age, they can start to make all sorts of strange and unfamiliar noises. While some noises result from normal wear and tear, others can indicate serious problems. If you’re hearing a humming noise coming from your furnace, it’s essential to have it checked out by our professional technicians. They can diagnose the problem and recommend the best course of action. In many cases, replacing an old furnace will solve the problem and restore peace to your home.

Rely on the Professionals

If your furnace is making a humming noise, a professional should check it out to diagnose the problem and find the best solution. With over 10 years of experience, the team at Quality Cooling & Heating will offer excellent diagnosis, repair, maintenance, and installation of furnaces. We also provide comprehensive cooling and heating services in the Greater Austin area and the Big Country. Contact Quality Cooling & Heating today to schedule an appointment for your furnace tune-up.

company icon