Indoor Air Quality Is a Consultative Science. The CIEC Proves You Practice It.
Blueprint-aligned practice questions across all 6 ACAC CIEC domains — IAQ contaminants, the built environment, HVAC, equipment, standards, and remediation — with detailed rationale on investigation method, instrument limitation, and defensible reporting.
Try one — free, no signup
Sample CIEC item. Pick an answer to see the rationale.
A residential client is concerned about formaldehyde exposure from recent renovations. Which concentration range represents typical background levels in homes without significant formaldehyde sources?
You only get one shot at this sitting.
License renewal, contract requirement, or promotion — whatever brought you to the CIEC, the exam fee, the time off work, and the conversation if it goes wrong all add up. CertPrep de-risks the attempt three ways: every question is mapped to ACAC’s published blueprint, four peer-reviewed learning-science methods sit under every session, and a readiness score tells you when you’re actually set to sit.
14-day money-back · 12-month access · Secure checkout via Stripe
420
Practice Questions
6
Exam Domains
75%
Pass Target
Walk in already certain.
Study material, practice exams, and readiness scoring — every item tied to a published CIEC learning objective.
Structured Study Material
Domain-by-domain study guides aligned to the official ACAC blueprint. Key terms, regulatory references, and exam-specific preparation — organized by weight.
Domain-Weighted Practice
Practice across IAQ Contaminants and Health Effects, The Built Environment, HVAC Systems, Instrumentation and Equipment, Guidelines, Regulations and Standards, Investigation and Remediation. Every answer includes a detailed rationale — correct option and why each distractor fails.
Full-Length Mock Exams
120 questions. 3 hours. Domain distribution mirrors the published CIEC blueprint — a blueprint-aligned mock simulation you can sit before booking the real exam.
Team Progress Tracking
Administrators see per-employee scores, domain weaknesses, and study activity. Export per-employee training records for HR, RFP, procurement, and internal review.
Complete Blueprint Coverage
Every question maps to an official ACAC exam objective. The coverage map gives a clear view across every domain so you can see where your team stands.
Exam Domain Distribution
Questions are weighted to match the real CIEC exam distribution from ACAC.
Common questions
Quick answers for individual buyers. Team buyers — head to /teams.
How fast can I start?
Sign up in under 60 seconds. The full CIEC bank — 420 questions, 6 domains, full-length mock exams — is unlocked the moment you create your account. No onboarding email, no scheduling call, no waiting.
What if I fail the exam?
12-month pass guarantee. If you completed at least 80% of the question bank, hit 70%+ on two full-length mocks, and reached the dashboard's exam-ready signal but still didn't pass, send us your official failure documentation within 30 days and we refund in full. Full terms on the refund policy page.
Can I get a refund if it's not working for me?
Yes — 14-day money-back on your first paid charge, no questions asked. Email support@certprepstudio.com within 14 days of purchase.
Can I retake mock exams?
Unlimited mock exams across the 12 months. Each pulls a fresh randomised pool from the question bank, so you don't memorise the same set. Calibration tracks how your accuracy moves between attempts.
Will it work on my phone?
Yes — full mobile-web support. You can sit a 60-question mock during a commute, log self-explanation responses, and pick up the next session on desktop. Your progress syncs across devices.
Is CIEC really the credential I should be sitting?
If you're sitting the Council-certified Indoor Environmental Consultant exam, yes — this is the prep for it. If you're not sure which credential applies to your role, email hello@certprepstudio.com and we'll point you to the right one (even if it isn't on our catalogue yet).
Running this for a team?
Admin dashboard, readiness tracking, per-employee training-record export.
From $149/seat/year (10+ seats). 14-day money-back guarantee on your first paid charge.
Walk in already certain.
10 free CIEC questions in 60 seconds. The full bank if you decide to keep going. 14-day money-back, 12-month pass guarantee.