A few weeks ago my furnace developed a vibration that can be heard throughout the house. If I remove the side panel of the furnace or if I remove the filter, the vibration goes away. My theory is that the fan works fine when it doesn't have to work hard but when pulling air through the filter (which is new) it has to work harder and vibrates.
My questions are: does this make sense? And if so, how can I troubleshoot it further?
-Edit- the old piece of junk ended up dying yesterday. We are replacing the unit.