Certified Indoor Environmentalist Prep

Would you like to become a Certified Indoor Environmentalist (CIE)? This designation demonstrates that you understand how to create healthy homes and buildings by preventing, diagnosing, and resolving indoor environmental problems. This online course prepares you to pass the CIE examination through a series of video lectures on exam topics such as contaminants, health effects, building science, HVAC, equipment, assessments, mold remediation, and industry standards and guidelines. The course...

6 Months / 32 Course Hrs
Open Enrollment
Offered in partnership with your preferred school

George Mason University

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Course code: GES716

What you will learn

  • Understand how HVAC systems can prevent (and cause) IAQ problems
  • Apply current industry guidelines
  • Understand the fundamentals of building science
  • Diagnose, resolve, and prevent common IAQ problems
  • Comprehend the full spectrum of contaminants, including mold, bacteria, volatile organic compounds, carbon monoxide, radon, allergens, and more
  • Understand and operate common IAQ instruments and equipment

How you will benefit

  • Work toward receiving your Certified Indoor Environmentalist certification
  • Demonstrate to clients and employers that you're certified and knowledgeable about indoor environmentalism
  • Begin working toward a new career
  • Improve the health of other individuals and people at large by working to reduce environmental contaminants

How the course is taught

  • Self-paced, online course
  • 6 Months to complete
  • Open enrollment, begin anytime
  • 32 course hours
  1. IAQ Contaminants And Health Effects
    1. IEQ
    2. Sick Building Syndrome
    3. Building Related Illness
    4. Dose Response
    5. Microns
    6. Taxonomy
    7. Ecology
    8. Mold
    9. Mold Spores
    10. Common Mold Types
    11. Health Effects of Mold
    12. Dampness and Health
    13. Bacteria
    14. Legionella
    15. Tuberculosis
    16. Viruses
    17. Allergens
    18. VOCs
    19. VOC Sources
    20. Common VOCs
    21. Reducing VOCs
    22. Multiple Chemical Sensitivity
    23. Radon
    24. Particulate
    25. Carbon Monoxide
  2. The Built Environment
    1. IAQ Problems
    2. Controlling IAQ Problems
    3. Air Pressure
    4. Pressurization
    5. Causes of Pressurization
    6. Stack Effect
    7. Psychrometrics
    8. Air Infiltration
    9. Vapor Diffusion
    10. Condensation
    11. Building Security
  3. HVAC
    1. Intro to HVAC
    2. Control of Contaminants
    3. Problem Areas
    4. Air Distribution Systems
    5. VAV Problems
    6. Ductwork
    7. Humidity Control
    8. Ventilation
    9. Outdoor Air Intakes
    10. Ventilation Effectiveness
    11. Filtration
    12. Filter Efficiencies
    13. Filter Replacement
    14. Electronic Air Cleaners
    15. Gas Phase Filtration
    16. HVAC Maintenance
    17. HVAC Inspections
  4. Equipment and Assessments
    1. Gathering Information
    2. Walk Through Inspections
    3. Instrumentation
    4. Indicator Measurements
    5. Assessing Ventilation
    6. CO2 and Ventilation
    7. Assessing Pressurization
    8. Assessing Surface Moisture
    9. Infrared Thermography
    10. Mold Sampling
    11. Air Sampling
    12. Viable Air Sampling
    13. Spore Trap Sampling
    14. Interpreting Air Samples
    15. Pump Calibration
    16. Surface Sampling
    17. Dust Sampling
    18. Other Mold Sampling
    19. Conditions During Sampling
    20. Assessing Particulate Matter
    21. Assessing VOCs
  5. Guidelines, Regulations And Standards
    1. ASHRAE 62.1 Scope
    2. 62.1 Definitions
    3. 62.1 Acceptable IAQ
    4. 62.1 Ventilation Rate Procedure
    5. 62.1 IAQ Procedure
    6. 62.1 Outdoor Air Requirements
    7. 62.1 Equipment Requirements
    8. 62.1 Operations and Maintenance
    9. ASHRAE 55
    10. 55 Air Speed
    11. 55 Measurements
    12. Exposure Guidelines
    13. MSDSs
    14. ACAC Code of Conduct
  6. Remediation
    1. Purpose of Mold Remediation
    2. Remediation Qualifications
    3. Communication
    4. Water Damage
    5. Structural Drying
    6. Engineering Controls
    7. Isolation
    8. Pressure Differential
    9. Air Changes
    10. Personal Protective Equipment
    11. Respirators
    12. Cleaning vs. Removal
    13. Hard Surfaces
    14. Porous Surfaces
    15. Disposal
    16. Controlling and Preventing Mold
    17. Antimicrobial Use
    18. Antimicrobial Nomenclature
    19. Antimicrobials Precautions

Ian Cull is the president of Indoor Sciences and has worked in the indoor air quality and building science fields since 1995. Previously, he served as vice president of the Indoor Air Quality Association (IAQA) from 2008-2011 and served as a director from 2006-2011. Cull has a Bachelor of Science in Engineering from the University of Illinois, Champaign-Urbana. He is a Licensed Professional Engineer (PE), a Certified Indoor Environmental Consultant (CIEC), and a Certified Indoor Air Quality Professional (CIAQP). Cull frequently lectures on indoor air quality and building science and has developed numerous seminars and certification courses on the topics.


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.


Hardware Requirements:

  • This course can be taken on either a PC or Mac.

Software Requirements:

  • PC: Windows 8 or later.
  • Mac: macOS 10.6 or later.
  • Browser: The latest version of Google Chrome or Mozilla Firefox are preferred. Microsoft Edge and Safari are also compatible.
  • Software must be installed and fully operational before the course begins.
  • Adobe Acrobat Reader.


  • Email capabilities and access to a personal email account.

Instructional Material Requirements:

The instructional materials required for this course are included in enrollment and will be available online. You will receive a PDF workbook to help guide you through the videos.

Yes, ed2go courses are completely online. However, keep in mind that not all certifying bodies or industry-specific certifications are recognized internationally. Please review your country's regulations prior to enrolling in courses that prepare for certification.

Yes, this course prepares you to take the Certified Indoor Environmentalist (CIE) examination offered by the American Council for Accredited Certification (ACAC). Additional fees apply.

This course is open enrollment, so you can register and start the course as soon as you are ready. Access to your course can take 24-48 business hours.

This course is self-paced and open enrollment, so you can start when you want and finish at your own pace. When you register, you'll receive six (6) months to complete the course.

The time allotted for course completion has been calculated based on the number of course hours. However, if you are unable to complete the course, contact the student advising team to see what options you may have available to work out a suitable completion date. Please note that an extension fee may be charged.

The course instructor will be available by email to answer any questions and provide feedback on your performance. Occasionally, your course may be supported by a team of industry experts. You will also receive support from the student advising team.

Upon successful completion of the course, you will be awarded a Certificate of Completion.

This course will provide you with the skills you need to obtain an entry-level position in most cases. Potential students should always do research on the job market in their area before registering.

This course is non-credit, so it does not qualify for federal aid, FAFSA and Pell Grant. In some states, vocational rehab or workforce development boards will pay for qualified students to take our courses. Additionally, some students may qualify for financial assistance when they enroll, if they meet certain requirements. Financing is available from select schools. Learn more about financial assistance.

If you have questions that are not answered on our website, representatives are available via LIVE chat. You can also call us at 1-877-221-5151 during regular business hours to have your questions promptly answered. If you are visiting us during non-business hours, please send us a question using the "Contact Us" form.

The CIE course is designed for consultants who may respond to specific, complex indoor air problems, without having to manage long-term relationships with the building occupants. The CIAQM course is designed for individuals working each day in the same facility in service or management to its occupants.

The American Council for Accredited Certification (ACAC) has two levels of certification, each based on the student's experience. The Certified Indoor Environmentalist (CIE) requires two years of field experience conducting indoor air quality investigations. The Certified Indoor Environmental Consultant (CIEC) requires eight years of experience on a broad range of indoor air quality topics.

Post-secondary degrees in science and engineering may reduce the required experience requirements. For a more detailed explanation of the experience needed to become certified, please contact ACAC. As a reminder, there are no experience requirements to take this online course; these requirements only pertain to those who wish to obtain the optional certification.

American Council for Accredited Certification (ACAC)
The mission of the American Council for Accredited Certification (ACAC) is to provide prestigious certifications in the area of indoor air quality (IAQ). The council is the only accredited IAQ certifying body that operates as an independent third party, operating separately from training centers and industry membership organizations. The council is recognized for its independence, integrity, and credibility, and when you enroll in a course certified by ACAC, employers will know you're a serious professional with those traits as well.