77 Commercial Energy Inspector Exam Prep

77 Commercial Energy Inspector Study Guide

Exam Overview

Commercial Energy Inspector (77)

• Questions: 50 multiple-choice
• Time Limit: 2 hours (120 minutes)
• Format: Open book
• Cost: $320
• Code Books: 2021 IECC (International Energy Conservation Code) — Commercial Provisions
• Passing Score: 75% (38 of 50 questions)

Exam Content Breakdown

1. General/Administration – 14% (7 questions)
2. Building Envelope – 24% (12 questions)
3. Mechanical Systems (Energy) – 22% (11 questions)
4. Service Water Heating – 10% (5 questions)
5. Electrical Power and Lighting – 18% (9 questions)
6. Additional Efficiency Packages – 12% (6 questions)

1. General/Administration (14% – 7 questions)

IECC Chapter 1 — Scope and Administration

Key Sections

• C101: Scope — applies to commercial buildings and buildings not covered by residential provisions
• C102: Alternate materials and methods
• C103: Construction documents — energy compliance documentation required
• C104: Inspections — inspection at various stages for energy compliance
• C105: Fees, board of appeals

Compliance Paths (C401.2)

Three compliance options for commercial buildings:

1. Prescriptive (C402-C405): Meet specific component requirements
2. Total Building Performance (C407): Energy cost budget method
3. ASHRAE 90.1: Compliance with ANSI/ASHRAE/IES 90.1

Climate Zones

• IECC Figure C301.1: Climate zone map of the United States
• IECC Table C301.1: Climate zone definitions by county
• Climate zone determines insulation requirements, fenestration limits, and mechanical efficiency requirements
• Zones 1-8: Zone 1 (hot) to Zone 8 (cold)
• Moisture regimes: A (moist), B (dry), C (marine)

Definitions (C202)

Key terms:

• Building envelope: Physical separator between conditioned and unconditioned space
• Fenestration: Glazed openings (windows, doors, skylights)
• U-factor: Rate of heat transfer (lower = better insulation)
• R-value: Thermal resistance (higher = better insulation)
• SHGC: Solar heat gain coefficient (lower = less solar heat gain)
• Air barrier: Material providing resistance to airflow
• Continuous insulation (ci): Insulation without thermal bridges

2. Building Envelope (24% – 12 questions)

IECC Section C402 — Building Envelope Requirements

Opaque Envelope Requirements (C402.1)

• C402.1.3: Insulation installation requirements
• Insulation must fill the cavity completely
• Continuous insulation (ci) must be continuous across framing members
• Insulation must be protected from damage

Wall Insulation (C402.2)

• IECC Table C402.1.3: Opaque thermal envelope insulation requirements
• Requirements vary by climate zone and construction type
• Above-grade walls: Mass walls, metal frame, wood frame, other
• Below-grade walls: R-value requirements
• Continuous insulation (ci) requirements noted separately

Roof/Ceiling Insulation (C402.2)

• Insulation above deck: R-value requirements by climate zone
• Metal building roofs: Standing seam or through-fastened with insulation
• Attic and other: R-value requirements

Floor Insulation

• Mass floors, steel-joist floors, wood-framed floors
• Requirements vary by climate zone

Slab-on-Grade

• C402.2.4: Slab perimeter insulation required in most climate zones
• R-value and depth requirements by climate zone

Fenestration (C402.4)

• IECC Table C402.4: Fenestration U-factor and SHGC requirements
• Fixed windows vs. operable windows
• Curtain wall vs. entrance doors
• Skylights (separate U-factor and SHGC)
• Maximum fenestration area: 30% of gross above-grade wall area (C402.4.1)
• 40% with daylighting controls
• 5% skylight area of gross roof area

Air Leakage (C402.5)

• Air barrier required: Continuous air barrier for building envelope
• Testing option: Whole-building air leakage testing at 0.40 cfm/sf at 75 Pa
• Material air barrier: Must be tested to ≤0.004 cfm/sf at 75 Pa
• Assembly air barrier: Must be tested to ≤0.04 cfm/sf at 75 Pa
• Air barrier details at joints, seams, penetrations

3. Mechanical Systems — Energy (22% – 11 questions)

IECC Section C403 — Building Mechanical Systems

HVAC Equipment Efficiency (C403.2)

• C403.2.3: Minimum efficiency requirements reference federal standards
• Equipment must meet or exceed minimum efficiency ratings:
• Unitary AC: SEER/EER ratings
• Heat pumps: HSPF/SEER ratings
• Furnaces: AFUE ratings
• Boilers: Thermal efficiency/AFUE ratings
• Chillers: kW/ton or COP ratings

HVAC Controls (C403.4)

• Programmable thermostat: Required for each HVAC system
• Setback capability: Heating setback 55°F, cooling setup 85°F (unoccupied)
• Deadband: Minimum 5°F between heating and cooling setpoints
• Automatic shutoff: Systems >15 tons must have automatic shutoff controls

Economizers (C403.5)

• Air-side economizers: Required for cooling systems ≥54,000 BTU/h in many climate zones
• Water-side economizers: Alternative where allowed
• High-limit shutoff: Required to disable economizer when conditions unfavorable

Duct Insulation (C403.7)

• Supply ducts: R-6 minimum in unconditioned spaces (R-8 in some climate zones)
• Return ducts: R-6 minimum in unconditioned spaces
• Duct sealing: All ducts sealed per applicable standards
• Duct leakage testing: Required for ducts in unconditioned spaces