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 program 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 also covers practice questions in detail and provides a practice examination to ensure you succeed at becoming a Certified Indoor Environmentalist.


Upon successful completion of this program, you'll be able to do the following:

  • Pass the ACAC’s Certified Indoor Environmentalist examination
  • Understand the concepts contained in the CIE Required Body of Knowledge
  • Demonstrate the ACAC Required skills related to the following: 

                ◦ IAQ Contaminants and Health Effects
                ◦ The Built Environment
                ◦ HVAC
                ◦ Equipment and assessments
                ◦ Guidelines, Regulations, and Standards
                ◦ Remediation


The CIE certification will demonstrate that you can do the following:

  • 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, triggers to asthma and allergies, and more
  • Understand and operate common IAQ instruments and equipment

Your clients want to be confident that they are hiring a trustworthy and competent consultant. One of the best ways to demonstrate your competency is to obtain a third-party accredited certification, such as the Certified Indoor Environmentalist (CIE). The CIE certification is sponsored by the American Council for Accredited Certification (ACAC).

The CIE Prep Course will prepare you to pass the CIE examination. The examination is offered at computerized testing centers throughout the US and beyond. Certain experience requirements and fees apply to students obtaining certification; however, no experience is required to participate in the CIE Prep course.

Upon registering, you're given six months to complete this program.

  • Registration + Fees

    Begins: Open enrollment | REGISTER

    Course: OIEX800.01 

    Tuition: $1,095 | Prospective students of this program may be eligible for full or partial federal tuition assistance under the Workforce Innovation and Opportunity Act.

  • Outline

    IAQ Contaminants And Health Effects

    • IEQ
    • Sick Building Syndrome
    • Building Related Illness
    • Dose Response
    • Microns
    • Taxonomy
    • Ecology
    • Mold 
    • Mold Spores
    • Common Mold Types
    • Health Effects of Mold
    • Dampness and Health 
    • Bacteria
    • Legionella 
    • Tuberculosis
    • Viruses
    • Allergens
    • VOCs 
    • VOC Sources 
    • Common VOCs
    • Reducing VOCs
    • Multiple Chemical Sensitivity
    • Radon 
    • Particulate
    • Carbon Monoxide 

    The Built Environment

    • IAQ Problems
    • Controlling IAQ Problems
    • Air Pressure
    • Pressurization 
    • Causes of Pressurization
    • Stack Effect
    • Psychrometrics
    • Air Infiltration
    • Vapor Diffusion
    • Condensation
    • Building Security


    • Intro to HVAC 
    • Control of Contaminants 
    • Problem Areas 
    • Air Distribution Systems
    • VAV Problems
    • Ductwork
    • Humidity Control 
    • Ventilation
    • Outdoor Air Intakes
    • Ventilation Effectiveness
    • Filtration
    • Filter Efficiencies
    • Filter Replacement
    • Electronic Air Cleaners
    • Gas Phase Filtration
    • HVAC Maintenance
    • HVAC Inspections

    Equipment and Assessments

    • Gathering Information
    • Walk Through Inspections
    • Instrumentation
    • Indicator Measurements
    • Assessing Ventilation
    • CO2 and Ventilation
    • Assessing Pressurization
    • Assessing Surface Moisture
    • Infrared Thermography
    • Mold Sampling
    • Air Sampling
    • Viable Air Sampling
    • Spore Trap Sampling
    • Interpreting Air Samples
    • Pump Calibration
    • Surface Sampling
    • Dust Sampling
    • Other Mold Sampling
    • Conditions During Sampling
    • Assessing Particulate Matter
    • Assessing VOCs

    Guidelines, Regulations And Standards

    • ASHRAE 62.1 Scope
    • 62.1 Definitions
    • 62.1 Acceptable IAQ
    • 62.1 Ventilation Rate Procedure
    • 62.1 IAQ Procedure
    • 62.1 Outdoor Air Requirements
    • 62.1 Equipment Requirements
    • 62.1 Operations and Maintenance
    • ASHRAE 55
    • 55 Air Speed
    • 55 Measurements
    • Exposure Guidelines 
    • MSDSs
    • ACAC Code of Conduct


    • Purpose of Mold Remediation
    • Remediation Qualifications
    • Communication
    • Water Damage
    • Structural Drying 
    • Engineering Controls
    • Isolation
    • Pressure Differential 
    • Air Changes 
    • Personal Protective Equipment
    • Respirators
    • Cleaning vs. Removal
    • Hard Surfaces 
    • Porous Surfaces
    • Disposal
    • Controlling and Preventing Mold
    • Antimicrobial Use
    • Antimicrobial Nomenclature
    • Antimicrobials Precautions
  • Requirements

    This program is compatible with the Windows XP and later operating systems and IE 7 and later browsers. The program is also viewable on iPad tablets and other iOS devices.

    All material is available online. You will receive a PDF workbook to help guide you through the videos.

    A high-speed internet connection is highly recommended.


    There are no prerequisites to taking the CIE Program. There are, however, experience requirements for those students wishing 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 program; however, the course material does not assume the learner has already received training and therefore topics are explained thoroughly.

  • Instructor

    Ian Cull, PE, CIEC, CIAQP is the President of Indoor Sciences. He is a well-known speaker and consultant on topics related to indoor air quality, mold, and green buildings.

    Mr. Cull began in the fields of indoor air quality (IAQ) and building science in 1995 when joining Chelsea Group, Ltd. Through the years, Mr. Cull has developed and taught numerous seminars, certification courses, and customized presentations reaching over 2,000 individuals in the US and several other countries including China and India. Mr. Cull has been the principal instructor for the following courses: Certified Indoor Environmentalist (CIE), Fundamentals of Indoor Air Quality and HVAC, Certified IAQ Manager (CIAQM), and Certified Microbial Investigator (CMI). His in-depth knowledge in all aspects of building science, IAQ, and sustainability make him a highly respected and commended teacher.

    Mr. Cull is a professional environmental engineer whose skill in the classroom is based off his vast experience managing a large number of projects focusing on improved indoor environments and sustainability. His experience ranges from assessments in offices, schools, homes, dormitories, condominiums, hospitals, and health care facilities. Mr. Cull is not only proficient in finding problems, but offering appropriate solutions and recommendations to prevent future re-occurrences.

    Mr. Cull served as Vice President of the Indoor Air Quality Association (IAQA) from 2008-2011. He was elected by the membership of the IAQA to serve as a Director from 2006-2011. Mr. Cull also served as a non-voting board member of the Indoor Environmental Standards Organization (IESO) from 2007-2010.

    Ian Cull has a Bachelor’s of Science degree in Engineering from one of the country’s top Environmental Engineering programs at University of Illinois, Champaign-Urbana. He is a Licensed Professional Engineer (PE) in the state of Illinois, a Certified Indoor Environmental Consultant (CIEC), and a Certified Indoor Air Quality Professional (CIAQP).

    Ian Cull is a member of the Indoor Air Quality Association (IAQA), American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE), the American Industrial Hygiene Association (AIHA), and the International Society of Indoor Air Quality and Climate (ISIAQ).

  • FAQs

    1. Can I register for programs if I am an international student?

    Yes, because ed2go programs are online you never have to actually travel to the school. Most schools offer telephone or online registration.

    2. How long does it take to complete a program?

    All of our programs are self-paced and open enrollment, which means you can start and finish the program at your own pace. Upon registering, you're given an initial six months to complete this program.

    3. Do I have to buy additional materials?


    4. Can I get financial assistance?

    ed2go courses are non-credit courses, so they do not qualify for federal aid. In some states, vocational rehab or workforce development boards will pay for qualified students to take our courses.

    5. What happens when I complete the program?

    Upon successful completion of the program, you will be awarded a certificate of completion.

    6. Am I guaranteed a job?

    ed2go programs will provide you with the skills you need to obtain an entry-level position in most cases. We don't provide direct job placement services, but our facilitators and career counselors will help you build your resume and are available to give advice on finding your first job. Facilitators will also be available to use as a professional reference upon completion of the program. Potential students should always do research on the job market in their area before registering.

    7. Who will be my instructor?

    Each student is paired up with a facilitator for one-on-one interaction. The facilitator will be available (via e-mail) to answer any questions you may have and to provide feedback on your performance. All of our facilitators are successful working professionals in the fields in which they teach.

    8. What software or hardware do I need in order to take online programs and what are the system requirements?

    In order to take our online programs, you must have access to a computer and the Internet. You can access the program contents from any Web-enabled computer. You don't have to use the same computer to log-in to the program every time. We recommend that you have a the latest version of Internet Explorer.

    9. Can I use a Mac?


    10. How can I get more information about the program?

    If you have questions that are not answered on our website, please feel free to contact us via LIVE chat (click the button toward the top of the page). If you are visiting us during non-business hours, please feel free to send us a question using the "Contact Us" form to the right. You may also call us at 1-855-520-6806. We will answer your questions promptly.

    11. When can I start the program?

    Our programs are all open enrollment. You can register and start the program as soon as you are ready.

    Please note: Once the program curriculum is accessed online or through submission of a material shipment confirmation, refunds cannot be issued.

    12. Does taking this program make me certified?

    No. Students wishing to become a Certified Indoor Environmentalist (CIE) must meet certain eligibility requirements and pass an examination offered by the American Council for Accredited Certification (ACAC). Additional fees apply.

    13. How is this program different from the Certified Indoor Air Quality Manager (CIAQM)?

    The CIE program 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 Program is designed for individuals working each day in the same facility in service or management to its occupants.

    14. This program prepares students for the CIE and CIEC certifications. What is the difference between those?

    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 program; these requirements only pertain to those who wish to obtain the optional certification.

    15. What if I don't have enough time to complete my program within the time frame provided?

    The time allotted to complete your program has been calculated based on the number of hours for each program, so don't worry too much about not completing in time. If, after a concerted effort, you are still unable to complete, your Student Advisor will help you work out a suitable completion date. Please note that a fee will be charged for an extension.

  • Reviews

    "The material was presented in a manner easy to absorb. Each module was the perfect length.
" - J.M., County College of Morris