InterNACHI HEA

No. This is an independent study resource written for candidates preparing for the HEA certification exam. It is not affiliated with, endorsed by, or operated by InterNACHI®. Use it for practice and review, then verify all exam logistics, fees, and requirements directly with InterNACHI® before you register or schedule.

It tests the working knowledge of a residential energy auditor: heat transfer and building science, insulation and air sealing, windows and doors, HVAC and combustion safety, ventilation, blower door and duct leakage diagnostics, energy modeling, utility bill analysis, prioritizing improvements, and client reporting and ethics. Expect applied questions, not trivia.

We could not verify the current question count, time limit, or passing score from the official source at the time of writing, so we do not publish numbers that may be outdated. Check the official InterNACHI® certification materials for the authoritative format before your test date, and plan your study time around what you find there.

Candidates with inspection or construction backgrounds usually find the envelope and HVAC material familiar, but the diagnostic and modeling sections are where most preparation is needed. Difficulty comes from interpreting test data and reasoning about interacting systems, not from memorizing definitions. Practice explaining why a reading occurred, not just what it was.

Start with building science and heat transfer, including conduction, convection, radiation, and moisture movement. Everything downstream, from insulation choices to blower door interpretation, depends on it. Then move to envelope and air sealing, HVAC and combustion safety, diagnostics, and finally modeling, bill analysis, and reporting.

Weak grasp of pressure and airflow basics, confusing duct leakage with envelope leakage, misreading blower door results, ignoring combustion safety and backdrafting risks, and recommending upgrades without weighing cost, savings, and sequencing. Another frequent problem is poor client communication: reporting numbers without explaining what they mean for the homeowner.

Retake rules, waiting periods, and any associated costs are set by InterNACHI® and were not confirmed from the official source. Do not assume a free or immediate retake. Confirm the current retake policy with InterNACHI® before scheduling, and treat your first attempt as the one to prepare for properly.

Review your weakest domain rather than rereading everything. Work through diagnostic scenarios: given a blower door result, a duct leakage figure, and a utility bill history, what would you recommend first and why? Practice a short verbal summary of findings for a homeowner, since reporting and communication carry real exam weight.

InterNACHI® states that it offers over 1,000 hours of free online education for members, and that All-Access Membership lets members work toward certification at their own pace at no additional cost. Confirm which specific courses map to the HEA credential on the official site, since course catalogs change.