Knowing what's a normal furnace noise can help you address small issues before they become costly repairs. A furnace making a constant buzzing or loud humming noise might indicate a problem with ...

If your water heater is leaking, making knocking noises or emitting rusty-looking ... to be replaced if it's more than 10 years old. For a furnace or boiler, it's 15 years. If your system is ...

If you hear clicking but your furnace isn’t working as it should, it’s worth calling a professional to check for mechanical or ignition issues. A heater making gurgling noises or bubbling ...