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humming droning sound when AC is running

2325 Views 2 Replies 2 Participants Last post by  green.willow
My air conditioning unit is five years old and was professionally installed. My house is 45 years old. This cooling season, a new sound has developed in one room in the house. It occurs when the AC is running. The sound is a droning/humming sound coming from the vents. The closest sound to compare is semi tires on asphalt. I only hear the sound in this specific room. Don't know if this makes a difference but the room with the sound is the room furthest away from the outside AC unit.

Any ideas of what is causing this sound and what I can do to make it go away?
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