Plus Air is home to Southern California's top HERS rating professionals. Our staff members have over 20 years of experience within the Air Conditioning Industry and are more than capable of meeting all of your HERS testing or air balancing needs. Plus Air is dedicated to providing you with the highest level of service at low and affordable rates. Plus Air has worked with hundreds of contractors and home owners to meet their energy saving needs by providing high quality duct testing and air balancing services.