When your furnace is running properly, it should give warmth without making too much noise. While it’s expected to notice your furnace making noise as it starts up, other sounds are indicating your furnace requires immediate professional support.

Here are some of the most common furnace noises and what they can be indicating. If your furnace is making an atypical noise, our friendly heating professionals are here to help with the best furnace repair in Rockford, Illinois.

1. Furnace Makes a Banging Sound

You might have a critical situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it might indicate there could be several problems. These involve gas increasing in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy over time, so that’s why it’s important to book annual furnace maintenance with Temperature Doctors Heating & Cooling. One of the jobs our technicians complete during this appointment is clean your furnace’s burners. When this piece gets grubby, you could hear your furnace making a loud rumbling noise after ignition takes more time. The ensuing gas buildup might crack your furnace’s heat exchanger, where natural gas transforms into warm air. Any fractures in it can emit carbon monoxide, which is normally released away from your home. This toxic gas can be fatal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Temperature Doctors Heating & Cooling urges you to turn it off and contacting us at (815) 914-6197. Too much natural gas in your furnace or a broken heat exchanger are serious troubles that necessitate fast service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to provide heated air throughout your home. If the ductwork wasn’t installed correctly or is aging, it can make a lot of noise when your furnace is on. This may be the issue if your furnace makes a banging noise when it shuts off. Contact Temperature Doctors Heating & Cooling at (815) 914-6197 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

If you hear your furnace making a buzzing noise, don’t wait to call us. A buzzing sound typically indicates an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to operate on the right voltage. If wires or the box isn’t tight enough, you might notice a low humming noise in the furnace when off. Your furnace also uses a blower motor, which distributes warm or cooled air around your rooms, and a capacitor, which turns on the motor. If either of these components are going out, they will buzz when the furnace turns on.

3. Furnace Makes Rattling Sounds Like Something Is Loose

If your furnace is making a rattling noise, it can be related to something small, like an unfastened screw, or something serious, like a broken piece. In either case, we recommend shutting off your furnace and contacting our heating pros at (815) 914-6197 for support.

4. Furnace Is Making a High-Pitched Squealing Sound

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s trying to alert you it needs some TLC. If you’ve neglected furnace maintenance recently, belts could be worn out or a bearing may need to be lubed. We know that maintenance often slips your mind, but our techs can get your furnace running quietly again quickly.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re hearing your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You could also notice whistling while the furnace is operating if a floor vent is loose. If you’ve looked at your vents but are still hearing whistling, Temperature Doctors Heating & Cooling can assist you. It’s important to get loose ductwork repaired without delay, because it can create comfort problems in your house and increase your gas costs.

6. Furnace Makes Noise that Sounds Like Scraping Metal

It’s not a good sign if you notice your furnace making a grinding noise. This metal-on-metal racket frequently means there’s an issue with your furnace’s blower. Turn off your furnace off now and reach our pros at (815) 914-6197 for assistance.

When you’re hearing an uncommon noise from your furnace, Temperature Doctors Heating & Cooling is here to provide assistance. Contact us at (815) 914-6197 to request your furnace repair appointment right away.