Have you ever thought about the air you are breathing?
If your air conditioning system has a bad odour when you first turn the system on it may have build up of micro-organisms such as mold as well as dirt and mildew in the system. Not only does this smell bad it can also become unhealthy. Have your vent system treated to remove the odour and the cause of the problem.
To learn more go to www.misthealthyair.org