Noisy Air Filters

It sounds more like the bearings are a little off track and may need to be replaced. What will happen is that as your unit kicks on, it will make a rumble for a few seconds until the motor gets spinning and balances out the force. It will not break your unit unless you leave it like that for a long time. It is not that expensive to have fixed. Definitely cheaper than replacing your unit. My husband does heating and cooling service and repair and we have come across that problem a lot. Good luck.

Hi D.!
You may be using the wrong type of filter. Our new home warranty people told us to use the cheapest filter we can find, not the expensive allergy control ones which are wove too tightly so no air can pass through, probably the reason you hear it getting sucked up each time the fan kicks on. As long as you change them regularly you don't need to worry about all the dust and allergens collecting in them anyway (every 3 months I think is recommended for ours). I also spray mine with Solumel to help with freshening the air and a little allergen control.
Hope that helps!
Jenny

Try some duct tape to hold into place

Hi, I asked my husband who is quite handy around the house. He said to put either a piece of foam or duct tape on one side as there is a gap in there. Just to wedge it tighter. Hope this helps. If not our son in law is a air conditioning man and his number is ###-###-####. His business is D. til Dusk Air Conditioning and Heating. N.