- The Honest Answer on the CRD Passing Score
- What Has and Hasn't Been Verified
- Why the Score Question Is Tied to Legacy Status
- The Nine Preparation Areas You Are Actually Measured Against
- Treating "Passing" as a Competence Standard
- If You Already Hold the CRD: Your Real Numbers
- Transition Guidance: CRD Versus the GRSD Path
- A Domain-Sequenced Preparation Plan
- Frequently Asked Questions
- No current CRD passing mark, question count, or time limit has been verified from IGSHPA, so treat any published number with suspicion.
- CRD means Certified Residential Geothermal Designer, issued by the International Ground Source Heat Pump Association (IGSHPA).
- Legacy CRD courses are offered case by case; new-candidate enrollment should be confirmed directly with IGSHPA before you plan around it.
- Active holders renew at $75 per year for members or $225 per year for non-members, with CEU documentation required.
The Honest Answer on the CRD Passing Score
If you searched for "CRD passing score" hoping to find a clean number like 70 percent or 75 percent, here is the straightforward truth: no current, issuer-verified passing mark for the Certified Residential Geothermal Designer exam is available in the sources we trust. Not a percentage, not a scaled score, not a number of questions you must answer correctly.
That may feel unsatisfying, but it is far better than the alternative. Several unrelated credentials share the "CRD" abbreviation, and their score requirements, fees, and domain weights circulate widely online. Borrowing any of those figures and attaching them to the geothermal designer credential would hand you a confident-sounding but wrong target. This article deliberately refuses to do that.
What we can do is explain precisely what is known, what is not, why the gap exists, and how to prepare in a way that makes the exact cut score largely irrelevant. If you want the broader picture first, our overview of what CRD certification is and our explainer on what CRD stands for will anchor the terminology.
What Has and Hasn't Been Verified
Separating confirmed facts from open questions is the most useful thing a candidate can do before committing time and money. Here is the current state of the evidence.
| Item | Status |
|---|---|
| Credential name and issuer | Confirmed: Certified Residential Geothermal Designer, IGSHPA |
| Certification tied to passing an examination | Confirmed in the historical course listing |
| Current passing mark | Not verified |
| Current number of exam questions | Not verified |
| Current time limit | Not verified |
| Initial exam fee | Not verified |
| Official weighted domain blueprint | Not verified; only unweighted topic headings are documented |
| Annual renewal fee for active holders | Confirmed: $75/year member, $225/year non-member |
| Open enrollment for new candidates | Verification hold; legacy courses offered case by case |
The historical event listing that documents the curriculum links certification to passing the corresponding examination. It does not publish a score threshold. Any site claiming a specific CRD cut score without citing a current IGSHPA source is, at best, guessing.
Why the Score Question Is Tied to Legacy Status
To understand why a passing score is hard to pin down, you need to understand where the CRD sits in IGSHPA's training lineup today. In a January 2026 white paper on sunsetting legacy training courses and certifications, IGSHPA reported that normal legacy training was being replaced by the end of 2025. The CRD falls into that legacy category.
Several practical consequences follow:
- Legacy courses run case by case. IGSHPA's current training page indicates legacy offerings are considered individually and offered mainly when a utility, state, or provincial program requires them.
- There is no standing public exam sitting to reference. Without a regular testing window, a published score standard has less reason to be advertised.
- Lapsed credentials cannot be reinstated. IGSHPA's current FAQ says so directly, which raises the stakes for anyone who already holds the designation.
- Active holders can keep renewing. Provided the certification does not lapse and continuing education is documented, existing holders may continue renewing indefinitely.
Eligibility questions are closely related, so if you are weighing whether you can even sit for a legacy offering, read CRD requirements alongside this piece.
The Nine Preparation Areas You Are Actually Measured Against
Even without a published cut score, the historical course listing documents nine preparation topic headings. These are curriculum headings, not an official weighted blueprint, so you should not assume any one area carries more points than another. Treat them as an evenly distributed map of what a residential geothermal designer must know cold.
1. Ground Source Heat Pump Benefits
You should be able to explain why a ground source system makes sense for a homeowner and articulate the case clearly.
- Efficiency advantages relative to conventional heating and cooling
- Comfort, longevity, and operating-cost arguments
- Environmental rationale a client may raise
2. System Components
A designer must know every major part of the loop-to-living-space chain.
- Heat pump unit, ground loop, circulating pump, and distribution
- How each component interacts with the others
- Where failures and inefficiencies typically originate
3. Heat Pump Types
Understanding the categories of equipment so you can match a unit to a job.
- Differences among available configurations
- Strengths, limitations, and appropriate applications
- How type selection influences downstream design decisions
4. Design Process
The sequence from client conversation to a defensible design.
- Information gathering and site assessment steps
- Order of design decisions and why sequence matters
- Documentation a designer is expected to produce
5. Energy Requirements
How much energy the building needs and how the system meets that demand.
- Heating and cooling demand characteristics
- Relating building needs to equipment capability
6. Load Calculations
Arguably the most computation-heavy area for most candidates.
- Determining heating and cooling loads for a residence
- Inputs that drive the result and how errors propagate
- Using results to size equipment sensibly
7. Performance Parameters, Site, Geology, and Soil Conditions
Why the same house performs differently on different ground.
- Site characteristics that influence loop performance
- Geology and soil conditions and their design implications
- Parameters that affect different heat pump types differently
8. Heat Pump and Pipe Design
Where theory becomes a buildable layout.
- Selecting and coordinating equipment with piping design
- Hydraulic and thermal considerations in the loop
9. Economics of Design
The financial case that closes a project.
- Weighing installation cost against operating savings
- Presenting economics honestly to a homeowner
For a deeper walkthrough of each heading, see our complete guide to the nine CRD content areas.
Treating "Passing" as a Competence Standard
Because the cut score is unverified, the smartest reframing is this: aim for demonstrable competence across all nine areas rather than a minimum mark. A designer who can run a load calculation, justify a heat pump type, and explain site-driven performance differences will clear almost any reasonable threshold.
This matters most for the quantitative areas. Load calculations and heat pump and pipe design reward precision. A small input error compounds through the design, so scoring well in those areas depends on method, not memorization. By contrast, the benefits and economics headings reward clear explanation and sound judgment.
Key Takeaway
Without a published weighting, do not gamble on skipping a heading. Spread effort across all nine areas, then add extra repetitions to Load Calculations and Heat Pump and Pipe Design, where mistakes are easiest to make and hardest to spot.
If you are trying to gauge how demanding the material is, our guide on how hard the CRD exam is and our overview of the CRD pass rate explain what is and is not known about outcomes.
If You Already Hold the CRD: Your Real Numbers
For existing credential holders, the number that matters is not a passing score at all. It is whether you keep your certification active, because lapsed legacy credentials cannot be reinstated. Here are the figures that are verified.
| Item | Verified Detail |
|---|---|
| Member renewal | $75 per year |
| Non-member renewal | $225 per year |
| Renewal term options | One, two, or three years |
| CEU requirement | Eight CEU points per three-year cycle, documented for processing |
| Individual membership (currently employed) | $125 per year |
| Fee policy effective date | January 1, 2024 |
Reading the CEU Requirement Correctly
The eight CEU points per three-year cycle are points, not eight classroom hours. Do not assume one hour of training equals one point. Confirm how IGSHPA credits each activity, and gather documentation as you go, since CEU records are required for processing the renewal.
The Membership Math
The member renewal price is only available if your membership covers the renewal term. At $75 per year for members versus $225 for non-members, the gap is $150 per year. An individual membership at $125 per year costs less than that gap, so for many holders the membership pays for itself, provided you actually need to buy it. If an eligible business, community, or utility membership already covers you, a separate individual membership is unnecessary. Check your coverage before purchasing anything.
Transition Guidance: CRD Versus the GRSD Path
IGSHPA describes taking the GRSD examination as a separate, optional upgrade path for legacy holders. It is not an automatic renaming of the CRD, and it does not replace your existing credential. This distinction trips up many candidates.
| Question | CRD (Legacy) | GRSD Path |
|---|---|---|
| Is it your current credential? | Yes, if you hold it and keep it active | No, it is a separate optional exam |
| Does it replace the CRD automatically? | Not applicable | No |
| Do GRSD rules apply to the CRD? | No | Only to GRSD itself |
Critically, GRSD objectives, exam fees, timers, reference rules, and validity periods should not be transplanted onto the CRD. They are different products with different rules. If you are weighing the upgrade, research the GRSD on its own terms with IGSHPA rather than assuming it mirrors the CRD.
If you are deciding whether to invest in the credential at all, our ROI analysis of CRD certification and the CRD salary guide discuss the earnings side, and CRD jobs covers who tends to hire designers.
A Domain-Sequenced Preparation Plan
Since the scoring threshold is unknown, build your plan around the material itself. This sequence front-loads the foundational concepts, then spends the most time on calculation-heavy areas.
Foundations: Benefits, Components, and Types
- Master vocabulary for system components
- Compare heat pump types side by side
- Practice explaining benefits in plain language
Process and Energy Requirements
- Memorize the order of the design process
- Connect building energy needs to equipment capability
Load Calculations
- Work calculations repeatedly, checking every input
- Review how small errors change equipment sizing
Site Conditions, Heat Pump and Pipe Design
- Study geology and soil effects on loop performance
- Practice coordinating equipment with piping layout
Economics and Full Review
- Work economic comparisons end to end
- Re-test your weakest two areas
For a fuller walkthrough, our CRD study guide expands on resources and pacing, and the CRD cheat sheet condenses the must-know facts. When you are ready to test yourself, try the practice questions at our main practice test site. Pairing timed practice with honest score tracking at residentialexam.com helps you see which of the nine areas needs another pass. You can also review CRD training options to understand how legacy coursework fits in.
Frequently Asked Questions
No current passing mark for the Certified Residential Geothermal Designer exam has been verified from IGSHPA. Because the credential is a legacy offering, a specific cut score is not publicly confirmed, so avoid any source quoting a precise number without citing a current IGSHPA document.
The current legacy-exam question count and time limit have not been verified. The historical listing confirms certification depends on passing the corresponding exam but does not publish format details. Ask IGSHPA directly if you are scheduled for a legacy offering.
No weighting has been verified. The nine headings come from a historical course listing and are unweighted preparation topics, not an official blueprint, so you should not assume any single area carries more points than another.
New-candidate availability is on a verification hold. IGSHPA offers legacy courses case by case, typically when a utility, state, or provincial program requires them. Confirm a specific current offering with IGSHPA before planning around it.
Active holders pay $75 per year as members or $225 per year as non-members, in one-, two-, or three-year terms, with CEU documentation required. Eight CEU points per three-year cycle are described, and these are points rather than classroom hours. Lapsed credentials cannot be reinstated.