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Is your unit outside on the ground. If so check for nearby odors comming from other apts or some wet areas nearby that your unit is picking up and distributing it to your apt.
We have a Jack In the Box about 2 blocks away and at times our ac unit picks up the aroma of hamburgers and distributes it through out the house. There is a nearby crematorium that burns the bodies late at night and ocassionally we smell that too when the ac comes on.