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100+ Free InterNACHI HEA Practice Questions

Pass your InterNACHI Certified Home Energy Auditor exam on the first try — instant access, no signup required.

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Heat pump water heaters work best when located in a space that:

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2026 Statistics

Key Facts: InterNACHI HEA Exam

75

Questions

InterNACHI HEA exam

80

Approx Cut-Off

InterNACHI weighted scoring

$0

Cost for Members

InterNACHI membership benefit

0-150

HERS Rating Range

RESNET HERS Index

RESNET

Standards Body

Residential Energy Services Network

50 Pa

Blower Door Test Pressure

ASTM E779 / RESNET 380

As of 2026-05-13, the InterNACHI Certified Home Energy Auditor exam is a 75-question self-paced online multiple-choice test with weighted scoring (typical ~80 cut-off) and is free for InterNACHI members. Content spans the building envelope and thermal/pressure boundary, insulation (R-value vs. U-factor; IECC climate-zone targets; install Grade I/II/III), air infiltration via blower door at 50 Pa (CFM50, ACH50, ACHnat via LBL N-factor), HVAC sizing (Manual J/S/D), efficiency ratings (AFUE, HSPF2, SEER2), duct leakage at 25 Pa, combustion safety (worst-case depressurization, CO action levels, BPI Gold Standard), hot water (EF/UEF, heat pump water heaters), and the audit report including the RESNET HERS Index (0-150 scale) and EPA Home Energy Score.

Sample InterNACHI HEA Practice Questions

Try these sample questions to test your InterNACHI HEA exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the thermal boundary of a building?
A.The exterior siding plane regardless of insulation location
B.The continuous layer of insulation that separates conditioned from unconditioned space
C.The location of the building's structural framing only
D.The interior drywall surface in every room
Explanation: The thermal boundary is the continuous layer of insulation that separates conditioned space from unconditioned space. It must be aligned with the air (pressure) boundary for the envelope to perform as designed. Misalignment between the two is one of the most common defects found during energy audits.
2What does R-value measure in building insulation?
A.The reflectivity of the surface to radiant heat
B.The resistance of a material to conductive heat flow
C.The rate of air leakage through an assembly
D.The relative humidity capacity of a material
Explanation: R-value measures a material's resistance to conductive heat flow. Higher R-values indicate greater resistance and therefore better insulation performance. R-value is the reciprocal of U-factor (R = 1/U).
3How is U-factor related to R-value for a building assembly?
A.U-factor equals R-value squared
B.U-factor is the reciprocal of R-value (U = 1/R)
C.U-factor equals R-value times surface area
D.They are unrelated metrics for different materials
Explanation: U-factor is the reciprocal of R-value: U = 1/R. U-factor measures the rate of heat transfer through the assembly, so a higher U-factor means more heat transfer (worse performance). A window with U-0.30 has an effective R-value of about R-3.3.
4Which of the following is an example of heat transfer by conduction?
A.Sunlight warming a dark roof on a summer afternoon
B.Warm air rising from a baseboard heater to the ceiling
C.Heat moving through a solid stud from a warm interior to a cold sheathing
D.Wind cooling a damp surface through evaporation
Explanation: Conduction is heat transfer through a solid material by direct molecular contact. Heat moving through a wall stud from the warm interior side to the cold sheathing is classic conduction. Studs act as thermal bridges in walls because wood (R-1 per inch) conducts heat faster than cavity insulation.
5Which heat transfer mechanism is responsible for heat loss through air leaks in the envelope?
A.Conduction
B.Convection (air movement carrying heat)
C.Radiation
D.Phase change
Explanation: Air leakage moves warm air to the outside (or draws cold air in) through cracks and penetrations. This is convective heat transfer because moving air is the carrier of energy. This is why air sealing is often more cost-effective than adding insulation in leaky homes.
6A wood-framed 2x6 wall cavity is filled with R-21 fiberglass batt insulation. The whole-wall R-value will be:
A.Exactly R-21 because that is the cavity rating
B.Higher than R-21 because of sheathing and air films
C.Lower than R-21 because of thermal bridging through studs
D.Approximately R-42, double the cavity value
Explanation: Whole-wall R-value is lower than the nominal cavity value because the wood studs (about R-1 per inch) conduct heat much faster than the insulation. With about 23% framing factor in a typical wall, the whole-wall effective R-value of an R-21 cavity is closer to R-15 to R-17 without continuous insulation.
7Why is continuous exterior insulation (rigid foam over the sheathing) increasingly common in code-built walls?
A.It is cheaper than cavity insulation
B.It breaks the thermal bridge created by studs and adds R-value across the entire wall
C.It eliminates the need for any cavity insulation
D.Building codes prohibit cavity insulation in new homes
Explanation: Continuous exterior insulation interrupts the thermal bridge created by studs, top plates, and headers, so it adds R-value uniformly across the wall instead of being short-circuited at every framing member. The IECC requires continuous insulation in colder climate zones for this reason.
8Which envelope component typically has the lowest R-value in a code-built home?
A.Attic insulation
B.Windows
C.Above-grade wall
D.Floor over an unconditioned garage
Explanation: Windows are the weakest link in the thermal envelope. A typical ENERGY STAR double-pane window has a U-factor near 0.30, which is roughly R-3.3 - far below typical wall (R-13 to R-21 cavity) or attic (R-38 to R-60) insulation. This is why window area, orientation, and SHGC matter so much in Manual J.
9What does SHGC stand for in window performance ratings?
A.Surface Heat Gain Coefficient
B.Solar Heat Gain Coefficient
C.Standard Heat Generation Capacity
D.Sealed Hot Gas Containment
Explanation: SHGC stands for Solar Heat Gain Coefficient. It represents the fraction of solar radiation that passes through a window (0 to 1). Lower SHGC reduces cooling loads in hot climates; higher SHGC may be desirable on south-facing windows in cold climates for passive solar gain.
10An auditor measures temperature differences with an infrared camera. A cold streak running vertically up a wall on a winter day is most likely:
A.A water leak in the wall
B.A missing insulation void or thermal bridge such as a stud
C.A reflection from a nearby cold object
D.Normal variation that requires no further investigation
Explanation: On a winter day with conditioned space warmer than outside, a vertical cold streak typically indicates either a missing-insulation void in the cavity or the cooler surface of a stud (thermal bridge). The auditor should differentiate using cavity-to-stud spacing patterns and a blower door to drive air through any voids.

About the InterNACHI HEA Exam

The InterNACHI Certified Home Energy Auditor (HEA) credential trains inspectors to perform whole-house energy audits covering the building envelope, insulation R-values, air infiltration, and HVAC systems. Auditors run a blower door test at 50 Pa to quantify CFM50 and ACH50, calculate Manual J heating and cooling loads, and assess combustion appliances under worst-case depressurization. The course also covers hot water systems, the HERS Index (0-150), and how to assemble a prioritized audit report with savings-to-investment ratios. The credential is free for InterNACHI members and pairs well with BPI Building Analyst or RESNET HERS Rater for utility-program work.

Assessment

75 multiple-choice questions, weighted scoring with section minimums (typical ~80 cut-off)

Time Limit

Self-paced online

Passing Score

Weighted; ~80 cut-off

Exam Fee

Free with InterNACHI membership (InterNACHI (International Association of Certified Home Inspectors))

InterNACHI HEA Exam Content Outline

16%

Building Envelope

Thermal boundary vs. pressure boundary, air-barrier alignment with insulation, fenestration U-factor and SHGC, framing assemblies, vapor retarders by climate zone

16%

Insulation

R-value vs. U-factor, IECC climate-zone targets (e.g., R-49 attic in CZ5+), batt vs. dense-pack cellulose vs. spray foam (open vs. closed cell), thermal bridging, RESNET Grade I/II/III installation

18%

Air Infiltration & Blower Door

Blower door test at 50 Pa reference pressure, CFM50, ACH50 = (CFM50 × 60) / volume, ACHnat via LBL N-factor (typically 17-25), zonal pressure diagnostics, smoke pencil and IR camera air-leak detection

14%

HVAC

ACCA Manual J load calc, Manual S equipment selection, Manual D duct design, duct leakage at 25 Pa (total and to outside), AFUE for furnaces, HSPF2/SEER2 for heat pumps, refrigerant charge basics

12%

Combustion Safety

Worst-case depressurization testing, spillage and backdrafting, CO action levels (9 ppm ambient, 35 ppm action), atmospheric vs. direct-vent vs. sealed-combustion appliances, BPI Gold Standard combustion safety protocol

12%

Hot Water

Storage tank vs. tankless, Energy Factor (EF) and Uniform Energy Factor (UEF), heat pump water heaters (HPWH), pipe insulation, hot-water distribution losses, low-flow fixtures (≤1.5 gpm aerators, 1.8 gpm shower heads)

12%

Audit Report & HERS

Audit report sections, prioritized recommendations, savings-to-investment ratio (SIR), simple payback, RESNET HERS Index (0 = net zero, 100 = 2006 IECC reference home, 150 = 50% more energy), EPA Home Energy Score 1-10

How to Pass the InterNACHI HEA Exam

What You Need to Know

  • Passing score: Weighted; ~80 cut-off
  • Assessment: 75 multiple-choice questions, weighted scoring with section minimums (typical ~80 cut-off)
  • Time limit: Self-paced online
  • Exam fee: Free with InterNACHI membership

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

InterNACHI HEA Study Tips from Top Performers

1Memorize IECC climate-zone R-value targets: attic R-30/R-38/R-49 by zone; walls R-13 to R-21 cavity plus continuous insulation in CZ4-8
2Blower door math: ACH50 = (CFM50 × 60) / house volume in cubic feet; reference pressure is 50 Pa; ACHnat ≈ ACH50 / 20 (LBL N-factor)
3HVAC efficiency ratings: AFUE (furnaces, %), HSPF2 (heat pump heating), SEER2 (heat pump/AC cooling); duct leakage tested at 25 Pa total and to outside
4Combustion safety (BPI Gold Standard): worst-case depressurization, CO action level 35 ppm action / 9 ppm ambient EPA NAAQS 8-hour, draft pressure < -2 Pa for atmospheric appliances
5HERS Index: 0 = net zero, 100 = 2006 IECC reference home, 150 = 50% more energy than reference; lower is better; administered by RESNET (Residential Energy Services Network)
6Water heater ratings: replaced Energy Factor (EF) with Uniform Energy Factor (UEF) in 2017; heat pump water heaters (HPWH) typically UEF 3.0+ vs. 0.95 for electric resistance
7Audit report priorities: rank measures by savings-to-investment ratio (SIR > 1 means cost-effective); air sealing usually has the highest SIR, followed by attic insulation, then HVAC upgrades

Frequently Asked Questions

What is the difference between the InterNACHI HEA and BPI Building Analyst?

The InterNACHI Certified Home Energy Auditor (HEA) is a free, self-paced online credential for InterNACHI members and is widely used by home inspectors who want to add energy audits to their services. BPI Building Analyst Professional is a third-party-proctored credential with field-test requirements that is typically required by utilities for incentive-program work. Many auditors hold both.

What is a blower door test and what does CFM50 and ACH50 mean?

A blower door depressurizes the house to 50 pascals below outdoor pressure. CFM50 is the cubic feet per minute of air the fan must move to maintain that 50-Pa pressure difference — it is a direct measure of leakage area. ACH50 = (CFM50 × 60) / volume, expressed in air changes per hour at 50 Pa. ACHnat (natural infiltration) is estimated by dividing ACH50 by a Lawrence Berkeley N-factor of roughly 17-25 depending on climate, height, and shielding.

What is the HERS Index and what does the scale mean?

The RESNET Home Energy Rating System (HERS) Index is a 0-150 scale where 100 represents a home built to the 2006 IECC reference standard, 0 represents a net-zero-energy home, and a higher number means more energy use. Every 1-point reduction equals roughly 1% less energy. A typical existing U.S. home scores about 130; new ENERGY STAR homes typically score 60 or lower.

What does worst-case depressurization testing check for?

It verifies that atmospheric or natural-draft combustion appliances (furnaces, water heaters, fireplaces) still vent safely when the house is depressurized by exhaust fans, clothes dryers, and HVAC return imbalances. Testers close interior doors, run all exhaust devices, and check for spillage and backdrafting at the appliance. BPI Gold Standard sets CO action levels and corrective actions.

What R-value should attic insulation meet?

IECC climate-zone R-value targets for attic insulation are R-30 in Zone 1, R-38 in Zones 2-3, and R-49 in Zones 4-8 for new construction; many programs and utilities recommend R-60 in colder zones for cost-effective retrofits. The HEA must compare existing R-value (estimated from depth and material) against the climate-zone target.

How does the InterNACHI HEA exam compare to the cost of other energy auditor credentials?

The InterNACHI HEA course and exam are free for InterNACHI members. BPI Building Analyst Professional typically costs around $500-$800 for the exam plus required field test. RESNET HERS Rater training and certification typically runs $1,500-$3,000. The InterNACHI credential is the most affordable entry point for inspectors adding energy audits.