The answer to 'furnace making noise' is that there are several common causes for a noisy furnace, including worn bearings, loose components, and problems with the blower motor. The symptoms can include rattling, squeaking, or grinding sounds coming from the furnace. In many cases, these issues can be addressed through simple DIY maintenance or minor repairs. However, if the noises persist or worsen, it's best to have a professional HVAC technician inspect and diagnose the problem to prevent further damage or safety issues.
Some common solutions for a noisy furnace include replacing worn bearings, tightening loose components, or servicing the blower motor. A professional technician can also check for more serious issues like a cracked heat exchanger, which would require a full furnace replacement.