IGSHPA Certified Residential Geothermal Designer (CRD) — Questions and Answers

Question 1: Which IGSHPA standard specifies minimum grouting requirements for vertical closed-loop geothermal boreholes to protect groundwater?

IGSHPA TC100
IGSHPA WQ-200
IGSHPA TR-006
IGSHPA C560 (Correct answer)

Correct answer: IGSHPA C560

IGSHPA C560 provides the standard specifications for thermally enhanced grout used to seal geothermal boreholes and protect groundwater aquifers.

Question 2: What is the PRIMARY purpose of obtaining CRD certification in Certified Residential Geothermal Designer?

To guarantee employment
To satisfy a personal achievement goal
To bypass educational requirements
To demonstrate verified competency and adherence to professional standards (Correct answer)

Correct answer: To demonstrate verified competency and adherence to professional standards

Certification demonstrates verified competency and adherence to professional standards.

Question 3: Which document must a geothermal contractor typically file with the state geological survey after completing vertical borehole drilling?

Army Corps of Engineers Discharge Report
OSHA Excavation Notification
EPA Underground Injection Control Form
Well Completion Report (Well Log) (Correct answer)

Correct answer: Well Completion Report (Well Log)

Most states require a Well Completion Report (well log) to be filed with the state geological survey documenting borehole depth, geology encountered, and grouting details.

Question 4: Which condition would trigger a requirement for Enhanced Geothermal System (EGS) environmental review that would NOT be required for a standard residential geothermal installation?

Installation of more than 5 vertical boreholes
Use of antifreeze in loop fluid
Use of high-pressure hydraulic stimulation of rock formations (Correct answer)
Borehole depth exceeding 500 feet

Correct answer: Use of high-pressure hydraulic stimulation of rock formations

Hydraulic stimulation (fracking) used in EGS triggers additional environmental review under federal and state regulations including induced seismicity risk assessment, unlike standard closed-loop drilling.

Question 5: A home energy auditor finds that a home's actual annual heating energy use is 30% higher than the Manual J-based estimate. Which factor is MOST likely responsible?

Higher-than-assumed infiltration due to air leakage not accounted for in the original calculation (Correct answer)
The ground loop was oversized, reducing system efficiency
The geothermal system's COP is higher than the manufacturer's rating
Occupants maintain a lower thermostat setpoint than design assumptions

Correct answer: Higher-than-assumed infiltration due to air leakage not accounted for in the original calculation

Underestimating infiltration in Manual J is the most common cause of actual heating energy exceeding predicted values, especially in older or poorly sealed homes.

Question 6: When developing a project budget for a residential geothermal installation, which cost category is typically the largest single line item?

Permitting fees
Ground loop drilling and installation (Correct answer)
Antifreeze fluid cost
Thermostat and controls

Correct answer: Ground loop drilling and installation

Drilling and installing the ground loop typically accounts for 40–60% of the total installed cost, making it the dominant budget item.

Question 7: A header manifold in a parallel ground loop field is sized primarily to:

Reduce system operating pressure below 30 psi
Allow individual bore circuits to be isolated for servicing
Increase total fluid velocity to prevent freezing
Ensure equal flow distribution to all parallel bore circuits (Correct answer)

Correct answer: Ensure equal flow distribution to all parallel bore circuits

Proper manifold sizing and reverse-return or balanced-tee design ensures equal flow through each bore, preventing short-circuiting of cooler or warmer fluid.

Question 8: Which heat pump rating condition is used by AHRI Standard 870 to certify residential geothermal water-to-air units?

EWT 50°F heating / 86°F cooling (Correct answer)
EWT 32°F heating / 77°F cooling
EWT 60°F heating / 104°F cooling
EWT 41°F heating / 59°F cooling

Correct answer: EWT 50°F heating / 86°F cooling

AHRI 870 rates residential water-to-air heat pumps at 50°F EWT for heating and 86°F EWT for cooling as the standard certification conditions.

Question 9: What is the purpose of a pre-construction site assessment in residential geothermal project management?

To select interior paint colors for the mechanical room
To size the electrical panel for the home's appliances
To determine the homeowner's credit score for financing
To identify site constraints such as setbacks, utility conflicts, soil conditions, and access for drilling equipment (Correct answer)

Correct answer: To identify site constraints such as setbacks, utility conflicts, soil conditions, and access for drilling equipment

A pre-construction site assessment identifies physical constraints that affect loop placement, equipment access, and overall project feasibility before signing contracts.

Question 10: What is the primary purpose of a hard start kit (potential relay and start capacitor) used with geothermal heat pump compressors?

To provide emergency backup power during electrical outages
To prevent the heat pump from starting during high utility demand periods
To sequence multiple heat pump units to prevent simultaneous starts
To reduce locked rotor amperage and provide extra torque during compressor start-up (Correct answer)

Correct answer: To reduce locked rotor amperage and provide extra torque during compressor start-up

A hard start kit reduces inrush (locked rotor) current and provides additional starting torque, which is especially useful on circuits with marginal voltage or when starting against system pressure.

Question 11: Which foundational principle is MOST important for success in Certified Residential Geothermal Designer?

Maximizing financial returns
Maintaining minimum certification requirements
Specializing in only one narrow area
Commitment to continuous learning, ethical practice, and quality outcomes (Correct answer)

Correct answer: Commitment to continuous learning, ethical practice, and quality outcomes

Success requires continuous learning, ethical practice, and focus on quality outcomes.

Question 12: When a geothermal system is designed with a 'hybrid' configuration pairing a ground loop with a cooling tower, what problem does this solve?

High drilling costs in rocky soil
Excessive domestic hot water demand
Cooling-dominated building loads that would thermally saturate the ground loop (Correct answer)
Insufficient heating capacity in extreme cold

Correct answer: Cooling-dominated building loads that would thermally saturate the ground loop

A cooling tower (or fluid cooler) rejects surplus heat to the atmosphere in cooling-dominated climates, preventing multi-year ground temperature rise that would degrade heat pump efficiency.

Question 13: When calculating cooling loads for a home with a dark-colored roof in a hot climate, which correction factor must be applied in Manual J?

An infiltration correction for roof-level stack effect
A SHGC value for the roof surface
Equivalent Temperature Difference (ETD) or Cooling Load Temperature Difference (CLTD) adjusted for roof color and mass (Correct answer)
A latency factor for roofing moisture absorption

Correct answer: Equivalent Temperature Difference (ETD) or Cooling Load Temperature Difference (CLTD) adjusted for roof color and mass

Manual J uses CLTD (or ETD) values that account for roof color, mass, and exposure to properly calculate solar-driven heat gain through the roof assembly.

Question 14: In a geothermal heat pump system, what does an auxiliary heat 'lockout' control primarily accomplish?

Locks out the ground loop pump when loop temperatures are too high
Prevents backup resistance heat from activating when the heat pump can adequately handle the load (Correct answer)
Prevents the system from operating during utility demand response events
Prevents the heat pump from running when outdoor temperatures exceed 65°F

Correct answer: Prevents backup resistance heat from activating when the heat pump can adequately handle the load

An auxiliary heat lockout control inhibits backup resistance elements from energizing whenever the heat pump is capable of maintaining comfort, preserving system efficiency.

Question 15: How frequently should ongoing assessments be conducted in Certified Residential Geothermal Designer practice?

Once annually regardless of circumstances
At regular intervals and as conditions change (Correct answer)
Only when problems are reported
Only when required by external auditors

Correct answer: At regular intervals and as conditions change

Ongoing assessments should follow established protocols and also respond to changing conditions.

Question 16: Which foundational principle is MOST important for success in Certified Residential Geothermal Designer?

Specializing in only one narrow area
Maintaining minimum certification requirements
Maximizing financial returns
Commitment to continuous learning, ethical practice, and quality outcomes (Correct answer)

Correct answer: Commitment to continuous learning, ethical practice, and quality outcomes

Success requires continuous learning, ethical practice, and focus on quality outcomes.

Question 17: What is a common range for simple payback periods for residential geothermal heat pump installations in the US after applying federal tax credits?

Exactly 7 years for all installations
5 to 15 years depending on local energy prices, load, and installation cost (Correct answer)
30 to 50 years making them economically unattractive
Less than 1 year in all US climates

Correct answer: 5 to 15 years depending on local energy prices, load, and installation cost

After applying the 30% federal tax credit, most US residential geothermal installations see payback periods ranging from roughly 5 to 15 years depending on local conditions.

Question 18: What is the primary benefit of adding a buffer tank (or hydraulic separator) to a hydronic geothermal heat pump system?

It balances electrical load across the three phases of service
It adds thermal mass to prevent short cycling of the heat pump compressor (Correct answer)
It stores excess ground loop antifreeze for seasonal use
It filters sediment and contaminants from the loop fluid

Correct answer: It adds thermal mass to prevent short cycling of the heat pump compressor

A buffer tank provides thermal mass between the heat pump and the distribution system, ensuring the compressor runs for adequate minimum on-times and preventing short cycling.

Question 19: What is the primary function of a desuperheater in a residential geothermal heat pump system?

Pre-heat domestic hot water using waste heat from the refrigerant cycle (Correct answer)
Regulate entering water temperature in the ground loop
Remove excess heat from the compressor housing
Reduce electrical consumption during utility peak demand periods

Correct answer: Pre-heat domestic hot water using waste heat from the refrigerant cycle

A desuperheater captures high-temperature waste heat from the refrigerant before it reaches the condenser and uses it to pre-heat domestic hot water at no additional energy cost.

Question 20: What control feature monitors entering water temperature (EWT) to the heat pump and protects the unit when loop temperatures fall outside safe operating limits?

Freeze protection thermostat on the domestic hot water line
Outdoor ambient temperature reset sensor
Loop temperature protection or low-EWT lockout control (Correct answer)
High-pressure refrigerant cutout switch

Correct answer: Loop temperature protection or low-EWT lockout control

A low-EWT (entering water temperature) lockout control shuts the heat pump down if loop temperatures drop below the minimum operating limit, preventing compressor damage.

Question 21: In Certified Residential Geothermal Designer, what is the PRIMARY purpose of conducting an initial assessment?

To fulfill administrative requirements
To establish a baseline and identify needs for appropriate action (Correct answer)
To generate documentation for billing
To demonstrate the assessor's expertise

Correct answer: To establish a baseline and identify needs for appropriate action

The initial assessment establishes a baseline and identifies specific needs to guide subsequent decisions.

Question 22: What is the primary purpose of using thermally enhanced grout instead of standard bentonite grout in geothermal boreholes?

To reduce installation costs by requiring fewer boreholes
To improve thermal conductivity between the ground loop and surrounding formation (Correct answer)
To comply with EPA drinking water contamination limits
To prevent frost heave in shallow borehole sections

Correct answer: To improve thermal conductivity between the ground loop and surrounding formation

Thermally enhanced grout has higher thermal conductivity than standard bentonite, improving heat transfer efficiency between the HDPE loop and surrounding soil/rock.

Question 23: In a closed-loop geothermal system, what is the primary purpose of the expansion tank?

Maintain glycol concentration
Increase system pressure to improve efficiency
Remove air bubbles from the loop
Absorb fluid volume changes due to temperature fluctuation (Correct answer)

Correct answer: Absorb fluid volume changes due to temperature fluctuation

The expansion tank accommodates the volumetric expansion and contraction of the loop fluid as its temperature changes, preventing dangerous pressure spikes.

Question 24: For a vertical closed-loop system in saturated soil, what is the typical design range for heat extraction per bore foot?

120–150 BTU/hr·ft
5–10 BTU/hr·ft
20–50 BTU/hr·ft (Correct answer)
75–100 BTU/hr·ft

Correct answer: 20–50 BTU/hr·ft

Saturated soils typically yield 20–50 BTU/hr per bore foot, depending on soil conductivity and system run time.

Question 25: Which control strategy improves geothermal heat pump efficiency by varying compressor output to match the actual heating or cooling load?

Two-position on/off compressor control
Variable capacity or variable speed compressor control (Correct answer)
Outdoor air reset of leaving water temperature
Time-of-day scheduling with fixed capacity

Correct answer: Variable capacity or variable speed compressor control

Variable capacity compressors modulate their output to closely match the building load, reducing cycling losses and improving overall system COP.

Question 26: What action should a commissioning technician take if the measured system COP is significantly below the manufacturer's rated value under similar conditions?

Accept the system and note the discrepancy without investigation
Replace the heat pump immediately without further diagnosis
Increase the thermostat setpoint to compensate
Investigate loop flow rate, refrigerant charge, air handler airflow, and entering water temperature before accepting the system (Correct answer)

Correct answer: Investigate loop flow rate, refrigerant charge, air handler airflow, and entering water temperature before accepting the system

A low COP has multiple potential causes that must be systematically diagnosed before the system is accepted or equipment replaced.

Question 27: What distinguishes a Certified Residential Geothermal Designer certified professional from a non-certified practitioner?

Certified professionals always have more experience
Certified professionals only work in larger organizations
Certification validates competency through standardized assessment against benchmarks (Correct answer)
There is no meaningful difference

Correct answer: Certification validates competency through standardized assessment against benchmarks

Certification provides objective validation of competency through standardized assessment.

Question 28: Which statement BEST describes the relationship between Certified Residential Geothermal Designer certification and industry evolution?

Certification requirements never change
Changes only occur when government mandates them
Requirements become less stringent over time
Requirements evolve periodically to reflect advances in knowledge and practice (Correct answer)

Correct answer: Requirements evolve periodically to reflect advances in knowledge and practice

Certification requirements evolve to keep pace with professional and technological advances.

Question 29: A designer uses a Ground Loop Heat Exchanger (GLHE) software tool and obtains a g-function. What does the g-function represent?

Dimensionless temperature response of the bore field over time (Correct answer)
Ground surface heat flux profile
Grout thermal conductivity vs. depth
Glycol flow rate correction factor

Correct answer: Dimensionless temperature response of the bore field over time

The g-function is a dimensionless thermal response factor that describes how the borehole field temperature changes over time under a unit heat pulse.

Question 30: Which factor most significantly affects the simple payback period of a residential geothermal heat pump compared to a high-efficiency gas furnace and central AC system?

The brand of the thermostat used
The color of the heat pump cabinet
The number of bedrooms in the home
The local cost of electricity versus natural gas and the heating/cooling load of the home (Correct answer)

Correct answer: The local cost of electricity versus natural gas and the heating/cooling load of the home

Payback period is driven primarily by the energy cost differential between the geothermal system and the fossil fuel alternative it replaces.

IGSHPA Certified Residential Geothermal Designer (CRD)

The CRD certification, administered by IGSHPA, validates expertise in designing residential ground source heat pump systems, covering system design principles, load calculations, ground heat exchanger design, installation standards, controls, and economic analysis. The open-book exam requires a minimum 80% passing score.

Questions

35 min

Time Limit

80%

To Pass

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