When your furnace is working correctly, it should deliver heat without making too much disruption. While it’s normal to hear your furnace making noise as it starts up, other sounds are indicating your furnace requires immediate professional assistance.

Here are some of the most reported furnace noises and what they can be signaling. If your furnace is making a weird noise, our friendly heating specialists are here to assist with the best furnace repair in Mason City, Iowa.

1. Furnace Making a Banging Noise

You might have an urgent issue on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it may signal there could be several problems. These involve gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy over time, so that’s why it’s important to schedule routine furnace maintenance with Mechanical Air Systems Co. One of the jobs our technicians perform during this service is clean your furnace’s burners. When this part gets grimy, you could hear your furnace making a loud rumbling noise if ignition takes longer than normal. The ensuing gas buildup may break your furnace’s heat exchanger, where natural gas turns into warm air. Any breaks in it can leak carbon monoxide, which is ordinarily vented outdoors. This toxic gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Mechanical Air Systems Co recommends turning it off and calling us at 641-243-4654. Significant natural gas in your furnace or a fractured heat exchanger are dangerous troubles that require fast repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to provide hot air around your home. If the ductwork wasn’t designed right or is getting old, it can be noisy when your furnace is heating. This might be the problem if your furnace makes a banging noise when it shuts off. Call Mechanical Air Systems Co at 641-243-4654 and we’ll pinpoint the problem.

2. Furnace Buzzes Constantly

If you observe your furnace making a buzzing noise, don’t delay calling us. A buzzing sound typically is telling you there’s an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to work on the proper voltage. If wires or the box needs to be tightened, you might hear a low humming noise in the furnace when off. Your furnace also works with a blower motor, which moves hot or cold air around your house, and a capacitor, which triggers the motor. If either of these components are fading, they will buzz when the furnace switches on.

3. Furnace Makes Rattling Sounds Like Something Is Loose

If your furnace is making a rattling noise, it can be due to something small, like an unfastened screw, or something critical, like a broken piece. In either case, we urge you to shut your furnace off and getting in touch with our heating pros at 641-243-4654 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s trying to get your attention it requires some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn out or a bearing might need to be lubricated. We realize that maintenance sometimes slips your mind, but our professionals can get your furnace heating quietly again quickly.

5. Furnace Whistles

When you’re noticing your furnace making a whistling noise, it’s typically due to an air leak in your ductwork. You could also be aware of whistling while the furnace is working if a floor vent isn’t tight. If you’ve checked your vents but are still noticing sound, Mechanical Air Systems Co can help. It’s essential to get loose ductwork fixed quickly, because it can make comfort troubles in your house and increase your energy costs.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you hear your furnace making a grinding noise. This metal-on-metal noise typically means there’s an issue with your furnace’s blower. Shut down your furnace off promptly and reach our professionals at 641-243-4654 for assistance.

When you’re getting an atypical noise from your furnace, Mechanical Air Systems Co is ready to support you. Contact us at 641-243-4654 to schedule your furnace repair appointment now.