It is freezing outside! The last thing you need is to come home to your furnace making all sorts of crazy noises. Not all noise is normal and there could be a few different reasons for noise. We will go over a couple of those reasons below. A loud bang at start up could be a delayed ignition. This happens when unburned oil builds up in the fire box chamber and is ignited all at once. This could be dangerous so make sure you call a technician at Bartlett Heating and Air right away. If your furnace makes noises while running you could have an issue with the fan that blows the hot air. If your furnace makes noises while running you could have fan bearings that are worn and need replacing. If your furnace makes noises while running you could have issues with any of the fans inside the furnace, this is usually a screeching sound. If you have a metallic chirping noise it might just be a natural noise. You can fix this by trying to align the wheel and also check that the mounting plate isn’t warped and rubbing against the blower. If there is a noisy rattling when your furnace shuts off, it very well may be the parts cooling down and nothing to worry about. Clanging noises are often the pipes contracting and cooling down. A loud bang could also mean a dirty burner or could also be the duct work contracting and expanding. A loud bang could also possibly be a dirty or broken gas valve. Odd vibrating or whining sound could be the furnace and that needs to be check out by a technician. A clunking or bumping sound could be a cracked belt. Some noises your furnace can make are annoying but not harmful and others are dangerous so it is always best to call a qualified technician like the ones at Bartlett Heating and Air to come check and make sure the furnace is running safe or fix any issue you might have. Call Bartlett Heating and Air today!