Is it a good idea or is it a bad idea to clean your air ducts?
It depends on what the air ducts are made of! If you have the strong sheet metal air ducts, then it might be a good idea to have a qualified company clean them. The key is a quality company that knows what they are doing!
But, if you have those flexible plastic air ducts that are in the majority of the homes that have been built in the past eight or so years then you might want to rethink having them cleaned. The flex-duct type plastic air ducting is like a sandwich. it is comprised of an inner layer of plastic like sheeting then a layer of fiberglass insulation and then an exterior layer of plastic. Most of the time the inner layer has a wire that is built into it so that the duct will have additional strength and flexibility to help keep the duct from crushing and closing up. This wire also gives the air duct a fan or accordion shape, that traps dirt and dust. The plastic flex- duct can not effectively be cleaned. Most of the time if cleaning is attempted the flex-duct will be damaged
We also have fiberglass fiberboard air ducts. This type of air duct can not be cleaned either. The fiberboard has a protective covering that is easily damaged.
We really do not want fiberglass particles floating around in the air we are breathing every day!