Everything you need for the 77 Commercial Energy Inspector exam — based on the 2021 International Energy Conservation Code® (IECC)
6-hour structured review covering Building Thermal Envelope, Administration and General Requirements, Mechanical Systems, and more — weighted to match 77 exam percentages
Timed 50-question simulation matching the 77 exam format with detailed answer explanations
Digital flip-cards for key terms, code sections, and references from the 2021 International Energy Conservation Code® (IECC)
Listen-and-learn audio covering high-yield 77 topics for studying on the go
Color-coded tab system for the 2021 International Energy Conservation Code® (IECC) — find answers fast during your open-book exam
Win the computer-based PRONTO exam: digital code book search tactics and a category-by-category section-finding playbook for the 77
Insert sheets with key tables, formulas, and values from the 2021 International Energy Conservation Code® (IECC) for blank code book pages
6-8 week structured program prioritized by 77 category weights — heaviest topics first
Intensive pre-exam review focusing on the highest-weighted 77 topics: Building Thermal Envelope, Administration and General Requirements, Mechanical Systems
Our study materials cover every category tested
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Commercial Energy Inspector (77)
The commercial provisions of the 2021 IECC carry a "C" prefix on every section number. When a question cites Section C403.12.1, go directly to the commercial half of the book — the residential half repeats the same numbering with an "R" prefix, and grabbing the wrong half is the most common open-book mistake on this exam.
Commercial buildings comply with C401.2.1 (IECC paths) or C401.2.2 (ASHRAE 90.1):
A building cannot cherry-pick: once a path is chosen, all of that path's requirements apply. Dwelling units and sleeping units in Group R-2 buildings without shared systems are deemed to comply if they meet residential Section R406.
A permanent certificate, completed by an approved party, must be posted on a wall where the space-conditioning equipment sits, in a utility room, or another approved location. It must list installed R-values for ceilings, roofs, walls, foundations and slabs; fenestration U-factors and SHGC values; and results of any envelope air-leakage testing. If placed on an electrical panel, it may not cover the circuit directory label.
Exempt from the thermal envelope provisions of C402:
Inspector tip: the climate zone drives nearly every numeric answer in C402 and C403. Establish the project's zone first, then enter the tables.
Opaque assemblies may comply by any one of three methods:
Group R occupancies use the "Group R" column of the tables; everything else uses the "All other" column — the Group R values are more stringent.
Low-sloped roofs directly above cooled conditioned spaces in Climate Zones 0 through 3 must be cool roofs: minimum three-year-aged solar reflectance of 0.55 and thermal emittance of 0.75, or an aged SRI of 64.
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Created by Levi Mittag — a Certified Building Official, Field Inspection Supervisor, and Lean Six Sigma Black Belt with 19 ICC certifications and 26 years in the building industry.
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Not just practice questions — a complete study system with audio, tabbing, and strategy.
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