I have a carrier with the ac outside and the gas furnace laying down, completely wrapped and taped in the attic. The house is two stories with two controls that control the unit.

Gas furnace model 58sta/stx

I have looked for the housing for the filter with no success, the unit is completely wrapped with insulation and taped in place. The manual is of no help, since it does not show a full image of the unit and where the filter housing is located within the unit

Please help, I have search on line, but there is only copies of the manual as a guide

Thanks

Do you have a single air return for the unit? Look there.