The sound that you are hearing could simply be more airflow. The new blower motors that are put into the current furnace technology are much more effective than older blower motors and are made to push air through your house.
Lennox® furnaces are some of the most efficient and quietest heating systems you can buy*. They're engineered for perfect warmth and savings.
New furnaces can have fairly loud, rumbly burner noises. You may also be getting noise from the blower echoing through the ducts because you have rigid sheet metal ductwork.
All new furnaces have more moving parts then the older furnaces had. All new furnaces make sounds that the older furnaces did not make. If you are referring to the sound of the induced draft blower that comes on just before your furnace fires up, that is a factor of all new furnaces.
A furnace that receives regular maintenance can last at least 15 to 20 years, but completing annual maintenance and being diligent with repairs can extend the life of a furnace even longer.
A loud buzzing noise almost always indicates that your furnace is working hard to generate warm air. This may mean that its blower fans are extremely dirty or that the motor powering the furnace fans is beginning to fail.
Acceptable noise levels for a furnace typically range between 40 to 60 decibels. However, it's important to note that specific noise levels can vary depending on the type and model of the furnace, as well as its location within the home.
Brands like Trane, Carrier, Lennox, Rheem, and Amana offer some of the most advanced and quietest models available today. When selecting a furnace, make sure to look for features like variable-speed blowers and sound-dampening technology to ensure the unit operates quietly.
On a normal day, your home's furnace might make a little noise as it starts up, when it's turning on, and then when it turns off. You can always expect to hear some noise from the furnace. The thing about this noise is that it should never be disruptive.
All-in-all, your air conditioning unit may be buzzing due to loose parts. Some components that can become detached and loose include fan blades, refrigerant piping, and other internal parts. In some cases, the loose part can be adjusted and tightened to fix the problem.
Normal Furnace Noises
Sometimes there is a little bit of a pop or click as the furnace fires up, then the heating system settles into a dull hum as it runs. Think of it like the click you hear when you turn on the burner on a gas stove.
Lennox Furnace
Lennox has the highest possible AFUE rating on this list. Its Dave Lennox Signature Collection, particularly the SLP99V model, achieves an outstanding 99% AFUE rating, currently the highest efficiency rating available in residential furnaces.
The 2-stage furnace, particularly when equipped with a variable speed blower, is generally quiet during its low-stage operation, which occurs about 80% of the time.
Today's furnaces are not only more efficient and safer but also significantly quieter. Central to this development is their focus on sound management.
The high-efficiency furnaces vent exhaust fumes may produce condensation from moisture in the air that must be drained. When there's an issue in draining this condensation, it may cause gurgling, dripping, or other watery sounds. Usually, these noises are easy enough to sort out.
7. Grinding, Scraping, or Clanking. If your furnace sounds like a train grinding and scraping away on tracks, then you probably have an issue with the blower wheel.
A high-efficiency gas furnace is typically much quieter than standard furnaces because it doesn't have to run as hard or burn as hot to heat your home. This is especially beneficial for those who need a quiet environment for sleeping or studying.
If the usual noise volume increases, or you start to hear flapping, rattling or high-pitched sounds from the supply vents, return grilles or ceiling diffusers, it's likely due to an increase in pressure caused by airflow restrictions somewhere in the HVAC system.
On the low end, the actual cost of the furnace might be less than $3,800 but that doesn't include any installation labor or other material costs. The high end reflects a deluxe, high-efficiency model but in some cases could cost over $12,000 if new venting is required, plus, other materials and installation labor.
Recommended maintenance includes cleaning the filters, checking the burner and heat exchanger, and inspecting electrical connections. An annual service plan can help ensure your furnace runs efficiently and prevent costly breakdowns.
Modern furnaces last a long time. With proper care, yours might last up to 30 years. However, when your furnace approaches that age, it's often a good idea to replace it, even while it's still working.