ICC Residential Energy Inspector/Plans Examiner (79) Overview
These study notes are designed to prepare candidates for the ICC Residential Energy Inspector/Plans Examiner certification exam (79). The content is anchored to the International Energy Conservation Code (IECC) and related standards. Candidates should verify all pass marks, eligibility, and administrative details with the official ICC Assessment Center.
For Technical Conquer practice planning, this module is tracked as 100 questions over about 120 minutes with a listed pass mark of 70%. Treat those numbers as practice baselines and verify the current official format before scheduling.
How This Guide Is Organized
The sections below turn the syllabus into studyable subject blocks. Read a subject first, explain the must-know ideas without notes, then use questions, flashcards, and mind maps to test whether the knowledge holds under field-style pressure.
- General Administration and Compliance Documentation
- Building Thermal Envelope Requirements
- Residential HVAC Systems and Equipment
- Service Water Heating and Electrical Power
- Performance-Based Compliance and Energy Rating
- Existing Buildings, Additions, and Alterations
Exam Snapshot and Readiness Target
Format: 100 questions, 120 minutes, pass mark 70% (practice baseline; verify with ICC)
Candidate level: Inspector/Plans Examiner - professional certification
Readiness target: Demonstrate ability to inspect and review residential energy code compliance, including thermal envelope, HVAC, water heating, electrical, and performance-based compliance.
Most candidates should budget at least 47+ focused study hours, then adjust upward for unfamiliar equipment, code, regulatory, commissioning, controls, or calculation-heavy content.
General Administration and Compliance Documentation
Syllabus Focus
- Scope and intent of the IECC
- Compliance paths (prescriptive, performance, trade-off)
- Permit and inspection requirements
- Certificate of compliance and documentation
Key Notes
- The IECC applies to residential buildings (R-3 and R-4) and commercial buildings; for this exam, focus on residential provisions.
- Three compliance paths: Prescriptive (R401.2), Performance (R405), and Trade-off (R402.1.5).
- Mandatory requirements apply regardless of compliance path (e.g., air leakage testing, duct sealing).
- Plans examiner must verify that construction documents include all required energy code details (R103.2).
- Inspector must verify field compliance with approved plans and code provisions; any deviations require revised approval.
- Certificate of compliance (R401.3) must be posted in the dwelling after final inspection.
Must Know
- IECC Chapter 1 (Scope and Administration) - permit, inspection, and certificate requirements.
- Mandatory requirements list (R401.2) - air barrier, insulation, fenestration, HVAC, water heating.
- Documentation requirements for each compliance path (R103.2, R401.3).
- Inspection sequence and required inspections (R104, R105).
Field and Exam Application
- Field: Verify that the building permit includes energy code compliance documentation before construction.
- Field: During rough-in inspection, confirm insulation and air barrier installation matches approved plans.
- Field: At final inspection, ensure certificate of compliance is posted and all mandatory items are met.
High-Yield Distinctions
- Prescriptive path: must meet all minimum R-values and U-factors; no trade-offs allowed.
- Performance path: uses software to show annual energy cost ≤ 85% of reference design (R405).
- Trade-off path: allows compensating envelope deficiencies with better fenestration or insulation elsewhere (R402.1.5).
Common Pitfalls
- Assuming prescriptive path allows trade-offs - it does not.
- Forgetting that mandatory requirements (e.g., air leakage testing) apply to all paths.
- Not verifying that the certificate of compliance is posted and signed by the builder.
Review Tasks
- Review IECC Chapter 1 and R401.2 mandatory requirements.
- Practice identifying which compliance path a set of plans uses.
- Create a checklist of required documentation for a typical residential project.
Building Thermal Envelope Requirements
Syllabus Focus
- Insulation and fenestration R-values and U-factors
- Air leakage and air barrier requirements
- Thermal envelope inspection and testing
- Fenestration compliance (NFRC ratings)
Key Notes
- Thermal envelope includes all opaque and fenestration components separating conditioned from unconditioned space.
- Minimum insulation R-values are specified in IECC Table R402.1.2 (climate zone dependent).
- Fenestration must meet U-factor and SHGC requirements from Table R402.1.3 or be NFRC labeled.
- Air barrier must be continuous and sealed; air leakage testing required (R402.4.1.2) with maximum leakage rate of 5 ACH50 (or 3 ACH50 in some climate zones).
- Insulation installation must meet Grade I, II, or III per RESNET standards; Grade I is required for prescriptive compliance.
- Thermal envelope inspection includes verifying insulation thickness, continuity, and air sealing details.
Must Know
- IECC Table R402.1.2 - insulation R-values by climate zone.
- IECC Table R402.1.3 - fenestration U-factor and SHGC by climate zone.
- Air leakage testing procedure (R402.4.1.2) and maximum leakage rates.
- Air barrier and insulation installation criteria (R402.4.4).
Field and Exam Application
- Field: Use a blower door to measure air leakage; ensure result ≤ 5 ACH50.
- Field: Inspect attic insulation for proper depth and coverage; check for gaps around penetrations.
- Field: Verify fenestration NFRC labels match approved plans and meet code minimums.
High-Yield Distinctions
- R-value vs. U-factor: R-value measures resistance; U-factor measures conductance (1/R).
- Continuous air barrier vs. vapor retarder: air barrier stops air leakage; vapor retarder controls moisture diffusion.
- NFRC label provides U-factor, SHGC, and VT; required for fenestration compliance.
Common Pitfalls
- Confusing R-value with U-factor - always check which is required.
- Assuming all insulation types have the same R-value per inch - varies by material.
- Forgetting that air leakage testing is mandatory, not optional.
Review Tasks
- Memorize climate zone map and corresponding insulation requirements.
- Practice reading NFRC labels and identifying U-factor and SHGC.
- Review air barrier sealing details for common penetrations (wires, ducts, pipes).
Residential HVAC Systems and Equipment
Syllabus Focus
- HVAC equipment efficiency requirements (SEER, AFUE, HSPF)
- Duct insulation and sealing
- HVAC system sizing and design (ACCA Manual J, S, D)
- Mechanical ventilation requirements
Key Notes
- HVAC equipment must meet minimum efficiency standards per IECC Table R403.1 (e.g., SEER ≥ 14, AFUE ≥ 80%).
- Ducts must be insulated to R-6 (supply) and R-3 (return) in unconditioned spaces; all ducts must be sealed (R403.2.1).
- Duct leakage testing required (R403.2.2): total leakage ≤ 6 CFM25 per 100 sq ft of conditioned floor area, or ≤ 4 CFM25 for rough-in test.
- HVAC system sizing must follow ACCA Manual J (load calculation), Manual S (equipment selection), and Manual D (duct design).
- Mechanical ventilation must comply with ASHRAE 62.2 (R403.5) - continuous or intermittent ventilation rates.
- Programmable thermostats required (R403.4) with automatic setback capability.
Must Know
- IECC Table R403.1 - minimum efficiency requirements for HVAC equipment.
- Duct insulation R-values and sealing requirements (R403.2.1).
- Duct leakage testing thresholds (R403.2.2).
- Ventilation rate calculation per ASHRAE 62.2 (R403.5).
Field and Exam Application
- Field: Verify duct insulation R-value by checking insulation label on duct wrap.
- Field: Perform duct leakage test using a duct blaster; record CFM25 and compare to limit.
- Field: Check thermostat model for programmable capability and setback settings.
High-Yield Distinctions
- SEER (Seasonal Energy Efficiency Ratio) for cooling vs. AFUE (Annual Fuel Utilization Efficiency) for heating.
- Duct sealing vs. duct insulation: sealing prevents air leakage; insulation reduces heat transfer.
- Continuous vs. intermittent ventilation: continuous runs 24/7; intermittent runs at higher rate for a fraction of time.
Common Pitfalls
- Assuming duct leakage test is not required if ducts are in conditioned space - it is still required.
- Confusing Manual J (load) with Manual D (duct design) - both are needed.
- Forgetting that ventilation rate must be calculated based on number of bedrooms and floor area.
Review Tasks
- Review ACCA Manual J, S, D summaries.
- Practice duct leakage test calculations.
- Calculate ventilation rate for a sample home (e.g., 3-bedroom, 2000 sq ft).
Service Water Heating and Electrical Power
Syllabus Focus
- Water heater efficiency requirements (EF, UEF)
- Pipe insulation requirements
- Lighting efficiency (CFL, LED, or high-efficacy fixtures)
- Electrical power and motor efficiency
Key Notes
- Water heaters must meet minimum efficiency per IECC Table R404.1 (e.g., EF ≥ 0.67 for gas storage, ≥ 0.95 for electric).
- Hot water pipes must be insulated to R-3 (R404.2) for pipes ≥ 3/4 inch diameter in unconditioned spaces.
- At least 50% of permanently installed lighting fixtures must be high-efficacy (R404.3) - typically LED or CFL.
- Electrical motors (e.g., furnace blowers) must meet minimum efficiency standards (R404.4).
- Pool pumps and heaters must meet specific efficiency requirements (R404.5).
Must Know
- IECC Table R404.1 - minimum water heater efficiency (EF or UEF).
- Pipe insulation requirements (R404.2).
- High-efficacy lighting definition (≥ 60 lumens/watt) and percentage requirement.
- Motor efficiency standards (R404.4).
Field and Exam Application
- Field: Inspect water heater nameplate for EF/UEF rating and compare to code minimum.
- Field: Check pipe insulation on hot water pipes in unconditioned crawlspace.
- Field: Count total lighting fixtures and verify at least 50% are high-efficacy.
High-Yield Distinctions
- EF (Energy Factor) vs. UEF (Uniform Energy Factor): UEF is newer metric; both measure overall efficiency.
- Pipe insulation R-3 vs. R-6: R-3 for hot water pipes; R-6 for HVAC ducts.
- High-efficacy lighting: ≥ 60 lumens/watt; standard incandescent is ~15 lumens/watt.
Common Pitfalls
- Assuming all water heaters meet code - check nameplate.
- Forgetting that pipe insulation is required only for pipes ≥ 3/4 inch diameter.
- Confusing lighting efficacy (lumens/watt) with wattage.
Review Tasks
- Review water heater efficiency tables for different fuel types.
- Practice calculating lighting percentage for a sample home.
- Identify common high-efficacy lighting types (LED, CFL).
Performance-Based Compliance and Energy Rating
Syllabus Focus
- Performance path (R405) - energy cost method
- Energy rating index (ERI) compliance (R406)
- Software tools (REM/Rate, EnergyGauge, etc.)
- Reference design and proposed design comparison
Key Notes
- Performance path requires proposed design to have annual energy cost ≤ 85% of reference design (R405.3).
- Reference design is identical to proposed in geometry and occupancy but meets prescriptive minimums.
- Energy rating index (ERI) compliance (R406) allows using HERS index ≤ 55 (or other threshold) as alternative.
- Software must be approved by the code official and simulate all energy uses (heating, cooling, water heating, lighting, appliances).
- Performance path documentation must include input/output reports from software (R405.5).
- Trade-offs are allowed within the performance path (e.g., better windows offset less insulation).
Must Know
- IECC R405 - performance path requirements and reference design specifications.
- IECC R406 - energy rating index compliance (HERS index).
- Software approval process and documentation requirements.
- Comparison of proposed vs. reference design energy cost.
Field and Exam Application
- Field: Verify that performance path documentation includes software output showing ≤ 85% cost.
- Field: Check that HERS rating is ≤ 55 if using ERI path.
- Field: Ensure all energy features are modeled correctly (e.g., duct leakage, air leakage).
High-Yield Distinctions
- Prescriptive vs. performance: prescriptive is simpler; performance allows flexibility.
- ERI vs. energy cost: ERI is a score (0-100, lower is better); energy cost is actual dollar amount.
- Reference design is not the same as code minimum - it is a specific baseline defined in R405.
Common Pitfalls
- Assuming performance path is easier - it requires software and detailed inputs.
- Forgetting that mandatory requirements still apply (e.g., air leakage testing).
- Not verifying software is approved by the local code official.
Review Tasks
- Review R405 reference design specifications (Table R405.2).
- Practice interpreting a HERS index report.
- Compare prescriptive and performance compliance documentation requirements.
Existing Buildings, Additions, and Alterations
Syllabus Focus
- IECC Chapter 5 - existing buildings
- Additions, alterations, and repairs
- Change of occupancy or use
- Historic buildings exemptions
Key Notes
- Additions must comply with IECC for the new portion; existing building may need upgrades if addition increases conditioned floor area by > 50% (R502.2).
- Alterations (e.g., replacing windows, adding insulation) must meet current code for the altered components (R503.1).
- Repairs must restore to original code level; no requirement to upgrade entire building (R504.1).
- Change of occupancy may trigger full compliance if new use has higher energy loads (R505).
- Historic buildings may be exempt if compliance would threaten historic character (R101.4.3).
- Air leakage testing may be required for additions if the existing building is being significantly modified.
Must Know
- IECC Chapter 5 - scope and applicability to existing buildings.
- R502 - additions: compliance requirements and triggers for existing building upgrades.
- R503 - alterations: component-specific compliance.
- R504 - repairs: limited scope.
- R505 - change of occupancy.
Field and Exam Application
- Field: Inspect an addition; verify new walls meet insulation R-values and fenestration meets U-factor.
- Field: During window replacement, ensure new windows meet current U-factor requirements.
- Field: For a historic building, verify exemption documentation from code official.
High-Yield Distinctions
- Addition vs. alteration: addition adds conditioned space; alteration modifies existing components.
- Repair vs. alteration: repair restores to original; alteration upgrades to current code.
- Change of occupancy: may require full compliance if energy use increases significantly.
Common Pitfalls
- Assuming all existing building work requires full compliance - only additions and certain alterations do.
- Forgetting that historic building exemption must be documented and approved.
- Not checking if addition triggers existing building upgrade (e.g., > 50% increase).
Review Tasks
- Review Chapter 5 definitions and scope.
- Practice determining compliance requirements for a given alteration scenario.
- Create a decision tree for existing building projects (addition, alteration, repair).
How To Use These Notes With Practice Questions
Do not jump straight from reading to a full mock. Work by subject first: review the key notes, make a short recall sheet from memory, then answer a focused question set. After each miss, decide whether the problem was missing theory, weak code/source recall, poor measurement setup, calculation error, or a field sequence you did not visualize.
Technical Conquer's question bank, flashcards, mind maps, and spaced review tools are most useful after this instruction layer because they reveal which parts of the notes are not yet retrievable.
Final Review Checklist
- Review IECC Chapters 1, 4, and 5 thoroughly.
- Memorize key tables: R402.1.2 (insulation), R402.1.3 (fenestration), R403.1 (HVAC efficiency), R404.1 (water heater efficiency).
- Understand the three compliance paths and their documentation requirements.
- Practice air leakage and duct leakage test procedures and thresholds.
- Review ACCA Manual J, S, D basics for HVAC sizing.
- Familiarize yourself with NFRC labels and HERS index reports.
- Check the ICC Assessment Center website for any updates to exam content or policies.
Official Sources and Further Reading
Use these sources as the final authority for format, eligibility, rules, regulatory limits, and exam updates. Study notes are a preparation layer, not a replacement for official candidate guidance.