There are no prerequisites to taking the CIE course. There are, however, experience requirements if you wish to take the optional certification exam by the American Council for Accredited Certification (ACAC). ACAC requires a high school diploma or GED, along with two years of documented field experience related to indoor air quality. Questions regarding certification should be directed to ACAC. Those with a background in HVAC, home inspection, construction, or healthcare may more easily comprehend certain sections of the course; however, the course material does not assume the learner has already received training and therefore topics are explained thoroughly.