Maddie,
Without seeing pictures there is no way I can tell if the filters are starving the unit, etc.
Everything I posted assumed that you had a Carrier heat pump. Basically, we would have to see pictures of both filter locations.
If the return grill has a latch and a frame to accept a 1" filter, then it IS designed for a filter.....the question remaining is if it is needed or not and if it is hurting the system by restriction or not.
Hope this helps!....but we need more info here to really be helpful.
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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