When your furnace is running correctly, it should deliver warmth without generating too much disruption. While it’s common to notice your furnace making noise as it starts up, other sounds are indicating your furnace should get immediate professional support.

Here are some of the most frequent furnace noises and what they might be signaling. If your furnace is making an atypical noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Frederick, Maryland.

1. Furnace Making a Banging Noise

You could have a serious issue on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it can indicate there could be a few problems. These range from gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system turns filthy over the years, so that’s why it’s essential to schedule annual furnace maintenance with May's Heating & Air. One of the jobs our techs do during this service is clean your furnace’s burners. When this component gets dirty, you might hear your furnace making a loud rumbling noise after ignition takes longer than normal. The resulting gas buildup can fracture your furnace’s heat exchanger, where natural gas turns into warmth. Any fractures in it can emit carbon monoxide, which is normally vented outside. This dangerous gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, May's Heating & Air urges you to turn it off and calling us at 301-690-0397. Significant natural gas in your furnace or a broken heat exchanger are serious issues that necessitate fast attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver heated air around your residence. If the ductwork wasn’t put in right or is aging, it can make a lot of noise when your furnace is on. This could be the problem if your furnace makes a banging noise when it shuts off. Contact May's Heating & Air at 301-690-0397 and we’ll pinpoint the problem.

2. Furnace Buzzes Constantly

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

Your furnace uses an internal transformer to work on the right voltage. If wires or the box needs to be tightened, you could hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends heated or cooled air throughout your home, and a capacitor, which starts the motor. If either of these parts are going out, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be related to something little, like a loose screw, or something serious, like a broken component. In either case, we recommend shutting off your furnace and contacting our heating specialists at 301-690-0397 for help.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s making an effort to get your attention it could use some TLC. If you’ve forgotten furnace maintenance the last couple of years, belts could be worn down or a bearing might need to be greased. We realize that maintenance frequently slips your mind, but our pros can get your furnace heating quietly again fast.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re detecting your furnace making a whistling noise, it’s likely due to an air leak in your ductwork. You may also notice whistling while the furnace is on if a floor vent isn’t secure. If you’ve checked your vents but are still sensing sound, May's Heating & Air can provide support. It’s critical to get loose ductwork fixed fast, as it can make comfort troubles in your residence and increase your utility bills.

6. Furnace Making a Grinding Noise

It’s not a good sign if you detect your furnace making a grinding noise. This metal-on-metal noise often means there’s an issue with your furnace’s blower. Switch off your furnace off right away and reach us at 301-690-0397 for assistance.

When you’re hearing a weird noise from your furnace, May's Heating & Air is available to support you. Contact us at 301-690-0397 to schedule your furnace repair appointment right away.