So there is a part on my furnace that is called a squirrel cage. I did some researching late at night because my furnace was making an awful thumping sound. I have deduced that the squirrel cage is the reason for my noise. The motor could sound almost like it is bouncing if the squirrel cage bearings are out. Online said to put a sturdy piece of styrofoam under the cage to stop it from moving. First, I did not like that the fix was not to actual repair the system, but just adding something around the home to stop it. Next, I did not like that I had no idea what bearings or a squirrel cage was. A squirrel cage is the type of fan that can be found in a furnace. It moves the air through the furnace and this is what heats your home. The reason it has such a stupid name is that the fan looks like a hamster cage. Apparently it is a lot of little fans working together to move the air in and out of the furnace. Most people just refer to it as a blower. The bearings or pieces holding it all together can prematurely wear out and allow it to bounce around. How the bearings can wear out is the blower is unbalanced or the heater has overheated to the point that the bearings could just not take it anymore. Either way, getting new bearings does not sound so expensive. I would way rather do this than add foam under a piece in my furnace.