HERS Rater Exam ACTUAL EXAM
2026/2027 | RESNET Certification |
120 Questions | Verified Q&A | Pass
Guaranteed - A+ Graded
Section 1: HERS Index Fundamentals & Scoring (Questions 1–10)
Q1: A home has a HERS Index of 65. What does this indicate about its energy performance compared to
the 2006 IECC reference home?
A. The home uses 65% less energy than the reference home
B. The home uses 35% more energy than the reference home
C. The home uses 35% less energy than the reference home [CORRECT]
D. The home uses 65% more energy than the reference home
Correct Answer: C
Rationale: The HERS Index is calculated such that 100 represents the energy use of the 2006 IECC
reference home. A score of 65 means the rated home uses 65% of the reference home's energy, or 35%
less (100 - 65 = 35). Option A incorrectly interprets the index as percentage savings directly. Option B
inverts the relationship. Option D completely misinterprets the scale direction.
Q2: Which of the following is the correct formula for calculating the HERS Index?
A. (Reference Home Energy Use ÷ Rated Home Energy Use) × 100
B. (Rated Home Energy Use ÷ Reference Home Energy Use) × 100 [CORRECT]
C. (Rated Home Energy Use - Reference Home Energy Use) ÷ Reference Home Energy Use
D. (Reference Home Energy Use - Rated Home Energy Use) ÷ Rated Home Energy Use
Correct Answer: B
Rationale: Per ANSI/RESNET/ICC 301-2022 Section 4.2.2, the HERS Index = (Rated Home Energy Use /
Reference Home Energy Use) × 100. This ratio format ensures that lower numbers indicate better
performance. Option A inverts the ratio, which would produce higher numbers for better homes.
Options C and D use incorrect difference-based calculations that don't produce the indexed scale.
,Q3: A builder is targeting ENERGY STAR certification, which requires a HERS Index of 50 or lower in
Climate Zone 4. The preliminary rating shows an Index of 52. Which modification would most likely
achieve compliance?
A. Upgrading from SEER 14 to SEER 16 air conditioner
B. Adding R-5 continuous exterior insulation [CORRECT]
C. Replacing double-pane windows with triple-pane windows
D. Upgrading from 80% AFUE to 95% AFUE furnace
Correct Answer: B
Rationale: In Climate Zone 4, adding continuous insulation significantly reduces thermal bridging and
overall heat transfer, typically yielding 3-5 HERS Index points. While all options improve efficiency,
continuous insulation addresses the envelope comprehensively. Option A typically yields 1-2 points.
Option C's window upgrade may only yield 1-2 points given already-efficient double-pane units. Option
D yields 2-3 points but is less impactful than envelope improvements in this climate.
Q4: What is the maximum allowed HERS Index for a home to qualify as DOE Zero Energy Ready Home
(ZERH) in 2026?
A. 40
B. 45
C. 50 [CORRECT]
D. 55
Correct Answer: C
Rationale: The DOE Zero Energy Ready Home program requires a maximum HERS Index of 50 (or 55 for
certain prescriptive paths in cold climates), with 50 being the standard threshold. This is significantly
more stringent than ENERGY STAR's climate-specific requirements. Option A represents an even more
aggressive voluntary target. Option B is a distractor between ENERGY STAR and ZERH. Option D
represents outdated 2015 program specifications.
Q5: In the HERS rating process, the "Rated Home" is defined as:
A. The home as it would be built to 2006 IECC specifications
B. The home as actually constructed with all measured features [CORRECT]
C. The home with all Energy Star certified appliances
D. The home with solar PV systems removed for baseline comparison
,Correct Answer: B
Rationale: Per ANSI/RESNET/ICC 301, the Rated Home represents the actual constructed home with all
measured or confirmed features, including orientation, insulation levels, HVAC specifications, and
renewable energy systems. Option A describes the Reference Home. Option C adds a program-specific
requirement not inherent to the rating. Option D describes a specific calculation variant, not the Rated
Home definition.
Q6: A 3,200 sq ft home in Climate Zone 5 has the following characteristics: R-21 cavity walls, R-38 attic,
SEER 16 AC, 92% AFUE furnace, no renewable energy. The reference home has R-13 walls, R-30 attic,
SEER 13 AC, 80% AFUE furnace. What direction will the HERS Index likely move?
A. Significantly above 100
B. Slightly above 100
C. Significantly below 100 [CORRECT]
D. Exactly at 100
Correct Answer: C
Rationale: The rated home exceeds reference home specifications in all major categories: envelope (R-
21 vs R-13 walls, R-38 vs R-30 attic) and HVAC (SEER 16 vs 13, 92% vs 80% AFUE). These improvements
typically yield a HERS Index in the 60-75 range for Climate Zone 5. Option A would indicate worse
performance. Option B might result from minor improvements only. Option D would require exact
equivalence to reference specifications.
Q7: When calculating the HERS Index, which energy end-use is NOT included in the annual energy cost
calculation?
A. Space heating
B. Space cooling
C. Plug loads
D. Swimming pool heating [CORRECT]
Correct Answer: D
Rationale: Per ANSI/RESNET/ICC 301 Section 4.2.1, the HERS Index calculation includes space heating,
space cooling, water heating, lights, appliances (including plug loads), and mechanical ventilation.
Swimming pool heating is explicitly excluded as an amenity feature not related to basic dwelling
function. Options A, B, and C are all mandatory components of the normalized energy use calculation.
Q8: A home has a HERS Index of 40 before renewable energy (PV) and adds a 6 kW solar array. What
happens to the HERS Index?
, A. It increases to approximately 50
B. It decreases to approximately 30 [CORRECT]
C. It remains at 40
D. It decreases to approximately 20
Correct Answer: B
Rationale: Solar PV reduces the net purchased energy, lowering the HERS Index. A 6 kW system typically
reduces the index by 8-12 points depending on climate, home size, and orientation, yielding
approximately 28-32. Option A incorrectly suggests renewable energy increases consumption. Option C
ignores the PV contribution entirely. Option D overestimates the typical impact—20 points would
require an exceptionally large system or very small home.
Q9: In the 2026 RESNET Standards, what is the minimum number of rated homes a candidate HERS
Rater must complete for provisional certification?
A. 1 provisional rating under direct supervision
B. 3 provisional ratings with field verification [CORRECT]
C. 5 provisional ratings with classroom training only
D. 10 provisional ratings independent practice
Correct Answer: B
Rationale: RESNET certification requires a candidate to complete 3 provisional ratings with field
verification by a certified Rating Field Inspector or Quality Assurance Designee. This ensures competency
in field data collection and blower door testing. Option A is insufficient for skill demonstration. Option C
lacks required field verification. Option D exceeds requirements but describes Quality Assurance
Designee experience levels, not initial certification.
Q10: A multifamily building with 20 units is being rated under ANSI/RESNET 301 Addendum A. How is
the HERS Index calculated?
A. Each unit rated separately, averaged for building score
B. Whole-building energy modeling with common areas allocated [CORRECT]
C. Sample of 4 units rated and extrapolated
D. Per-square-foot energy use comparison only
Correct Answer: B
Rationale: ANSI/RESNET 301 Addendum A specifies whole-building energy modeling for multifamily
structures, with common area energy use (hallways, lobbies, shared laundry) allocated to individual
units based on floor area or other defined metrics. Option A describes a non-compliant approach.
Option C describes sampling methods not permitted for HERS ratings. Option D describes an intensity
metric, not the HERS Index methodology.
2026/2027 | RESNET Certification |
120 Questions | Verified Q&A | Pass
Guaranteed - A+ Graded
Section 1: HERS Index Fundamentals & Scoring (Questions 1–10)
Q1: A home has a HERS Index of 65. What does this indicate about its energy performance compared to
the 2006 IECC reference home?
A. The home uses 65% less energy than the reference home
B. The home uses 35% more energy than the reference home
C. The home uses 35% less energy than the reference home [CORRECT]
D. The home uses 65% more energy than the reference home
Correct Answer: C
Rationale: The HERS Index is calculated such that 100 represents the energy use of the 2006 IECC
reference home. A score of 65 means the rated home uses 65% of the reference home's energy, or 35%
less (100 - 65 = 35). Option A incorrectly interprets the index as percentage savings directly. Option B
inverts the relationship. Option D completely misinterprets the scale direction.
Q2: Which of the following is the correct formula for calculating the HERS Index?
A. (Reference Home Energy Use ÷ Rated Home Energy Use) × 100
B. (Rated Home Energy Use ÷ Reference Home Energy Use) × 100 [CORRECT]
C. (Rated Home Energy Use - Reference Home Energy Use) ÷ Reference Home Energy Use
D. (Reference Home Energy Use - Rated Home Energy Use) ÷ Rated Home Energy Use
Correct Answer: B
Rationale: Per ANSI/RESNET/ICC 301-2022 Section 4.2.2, the HERS Index = (Rated Home Energy Use /
Reference Home Energy Use) × 100. This ratio format ensures that lower numbers indicate better
performance. Option A inverts the ratio, which would produce higher numbers for better homes.
Options C and D use incorrect difference-based calculations that don't produce the indexed scale.
,Q3: A builder is targeting ENERGY STAR certification, which requires a HERS Index of 50 or lower in
Climate Zone 4. The preliminary rating shows an Index of 52. Which modification would most likely
achieve compliance?
A. Upgrading from SEER 14 to SEER 16 air conditioner
B. Adding R-5 continuous exterior insulation [CORRECT]
C. Replacing double-pane windows with triple-pane windows
D. Upgrading from 80% AFUE to 95% AFUE furnace
Correct Answer: B
Rationale: In Climate Zone 4, adding continuous insulation significantly reduces thermal bridging and
overall heat transfer, typically yielding 3-5 HERS Index points. While all options improve efficiency,
continuous insulation addresses the envelope comprehensively. Option A typically yields 1-2 points.
Option C's window upgrade may only yield 1-2 points given already-efficient double-pane units. Option
D yields 2-3 points but is less impactful than envelope improvements in this climate.
Q4: What is the maximum allowed HERS Index for a home to qualify as DOE Zero Energy Ready Home
(ZERH) in 2026?
A. 40
B. 45
C. 50 [CORRECT]
D. 55
Correct Answer: C
Rationale: The DOE Zero Energy Ready Home program requires a maximum HERS Index of 50 (or 55 for
certain prescriptive paths in cold climates), with 50 being the standard threshold. This is significantly
more stringent than ENERGY STAR's climate-specific requirements. Option A represents an even more
aggressive voluntary target. Option B is a distractor between ENERGY STAR and ZERH. Option D
represents outdated 2015 program specifications.
Q5: In the HERS rating process, the "Rated Home" is defined as:
A. The home as it would be built to 2006 IECC specifications
B. The home as actually constructed with all measured features [CORRECT]
C. The home with all Energy Star certified appliances
D. The home with solar PV systems removed for baseline comparison
,Correct Answer: B
Rationale: Per ANSI/RESNET/ICC 301, the Rated Home represents the actual constructed home with all
measured or confirmed features, including orientation, insulation levels, HVAC specifications, and
renewable energy systems. Option A describes the Reference Home. Option C adds a program-specific
requirement not inherent to the rating. Option D describes a specific calculation variant, not the Rated
Home definition.
Q6: A 3,200 sq ft home in Climate Zone 5 has the following characteristics: R-21 cavity walls, R-38 attic,
SEER 16 AC, 92% AFUE furnace, no renewable energy. The reference home has R-13 walls, R-30 attic,
SEER 13 AC, 80% AFUE furnace. What direction will the HERS Index likely move?
A. Significantly above 100
B. Slightly above 100
C. Significantly below 100 [CORRECT]
D. Exactly at 100
Correct Answer: C
Rationale: The rated home exceeds reference home specifications in all major categories: envelope (R-
21 vs R-13 walls, R-38 vs R-30 attic) and HVAC (SEER 16 vs 13, 92% vs 80% AFUE). These improvements
typically yield a HERS Index in the 60-75 range for Climate Zone 5. Option A would indicate worse
performance. Option B might result from minor improvements only. Option D would require exact
equivalence to reference specifications.
Q7: When calculating the HERS Index, which energy end-use is NOT included in the annual energy cost
calculation?
A. Space heating
B. Space cooling
C. Plug loads
D. Swimming pool heating [CORRECT]
Correct Answer: D
Rationale: Per ANSI/RESNET/ICC 301 Section 4.2.1, the HERS Index calculation includes space heating,
space cooling, water heating, lights, appliances (including plug loads), and mechanical ventilation.
Swimming pool heating is explicitly excluded as an amenity feature not related to basic dwelling
function. Options A, B, and C are all mandatory components of the normalized energy use calculation.
Q8: A home has a HERS Index of 40 before renewable energy (PV) and adds a 6 kW solar array. What
happens to the HERS Index?
, A. It increases to approximately 50
B. It decreases to approximately 30 [CORRECT]
C. It remains at 40
D. It decreases to approximately 20
Correct Answer: B
Rationale: Solar PV reduces the net purchased energy, lowering the HERS Index. A 6 kW system typically
reduces the index by 8-12 points depending on climate, home size, and orientation, yielding
approximately 28-32. Option A incorrectly suggests renewable energy increases consumption. Option C
ignores the PV contribution entirely. Option D overestimates the typical impact—20 points would
require an exceptionally large system or very small home.
Q9: In the 2026 RESNET Standards, what is the minimum number of rated homes a candidate HERS
Rater must complete for provisional certification?
A. 1 provisional rating under direct supervision
B. 3 provisional ratings with field verification [CORRECT]
C. 5 provisional ratings with classroom training only
D. 10 provisional ratings independent practice
Correct Answer: B
Rationale: RESNET certification requires a candidate to complete 3 provisional ratings with field
verification by a certified Rating Field Inspector or Quality Assurance Designee. This ensures competency
in field data collection and blower door testing. Option A is insufficient for skill demonstration. Option C
lacks required field verification. Option D exceeds requirements but describes Quality Assurance
Designee experience levels, not initial certification.
Q10: A multifamily building with 20 units is being rated under ANSI/RESNET 301 Addendum A. How is
the HERS Index calculated?
A. Each unit rated separately, averaged for building score
B. Whole-building energy modeling with common areas allocated [CORRECT]
C. Sample of 4 units rated and extrapolated
D. Per-square-foot energy use comparison only
Correct Answer: B
Rationale: ANSI/RESNET 301 Addendum A specifies whole-building energy modeling for multifamily
structures, with common area energy use (hallways, lobbies, shared laundry) allocated to individual
units based on floor area or other defined metrics. Option A describes a non-compliant approach.
Option C describes sampling methods not permitted for HERS ratings. Option D describes an intensity
metric, not the HERS Index methodology.
