- CRD here means Certified Residential Geothermal Designer, a credential issued through the International Ground Source Heat Pump Association (IGSHPA).
- IGSHPA now treats CRD as a legacy credential; active holders can renew indefinitely if they never let it lapse.
- Lapsed legacy credentials cannot be reinstated, so renewal timing matters more than almost anything else.
- Renewal runs $75 per year for members or $225 per year for non-members, in one-, two- or three-year terms.
What a CRD Actually Is
The acronym CRD is shared by several unrelated credentials in different industries, so it is worth being precise. On this page, CRD means Certified Residential Geothermal Designer. It is a credential for people who size and design ground source heat pump (GSHP) systems for homes: the loop field, the heat pump, the load calculations and the economics that tie them together.
If you landed here searching for another CRD, nothing on this page applies to it. For quick orientation on the name itself, see our short explainers on what CRD stands for and the meaning of CRD. This article goes a level deeper into what the credential covers, how its status has changed and what that means for you in practical terms.
Who Issues the Credential
The governing body is the International Ground Source Heat Pump Association (IGSHPA), the long-standing industry organization behind geothermal training and certification in North America. IGSHPA's own documentation names the credential explicitly: its January 14, 2026 white paper on sunsetting legacy training courses and certifications identifies the Certified Residential Geothermal Designer on its first page.
Training for the credential has also been delivered through partner organizations. A historical IGSHPA event listing described an online CRD course run with HRAI (the Heating, Refrigeration and Air Conditioning Institute of Canada) in February 2025, and HRAI's 2025-26 course schedule advertised a virtual CRD course for late February 2026. A schedule is not proof that a course ran or that seats are open today, so treat these as history rather than a booking opportunity.
Legacy Status: What Changed
This is the single most important thing to understand about the CRD in 2026. IGSHPA's white paper reports that normal legacy training was replaced by the end of 2025. The practical consequences split by audience:
- Active CRD holders may continue renewing indefinitely, provided they complete the required continuing education and do not let the certification lapse.
- Lapsed holders are in a harder position: IGSHPA's current FAQ says lapsed legacy credentials cannot be reinstated.
- New candidates face a restricted picture. Legacy courses are considered case by case and offered only when a utility, state or provincial program requires them.
- Upgrade seekers have a separate path. Taking the GRSD examination is an optional upgrade, not an automatic renaming or replacement of the CRD.
For the eligibility angle, see our guide to CRD requirements and how to qualify, and for the timing question see CRD exam dates and scheduling.
The Nine Preparation Topics
The historical IGSHPA course listing organized CRD preparation into nine topic headings. These are curriculum headings, not weighted exam domains. No current legacy-exam blueprint, question count, time limit or passing mark has been verified, so no heading should be assumed to carry more exam weight than another. For a deeper walk-through, our complete guide to the nine CRD content areas expands on each one.
1. Ground Source Heat Pump Benefits
The case for geothermal as a heating and cooling technology.
- Efficiency advantages over conventional equipment
- Operating-cost and comfort arguments a designer must be able to explain to homeowners
2. System Components
The physical pieces that make up a residential GSHP installation.
- Heat pump unit, ground loop, circulation and distribution
- How each component interacts with the others
3. Heat Pump Types
The unit configurations a designer chooses between.
- Matching unit type to the home and its distribution system
4. Design Process
The sequence from site assessment to a finished design.
- Gathering inputs, making decisions in the right order, documenting results
5. Energy Requirements
How much heating and cooling energy a home actually needs.
- Connecting building characteristics to seasonal energy demand
6. Load Calculations
Quantifying peak heating and cooling loads.
- The numbers that drive equipment and loop sizing
- Errors here propagate through every later step
7. Parameters Affecting Performance: Site, Geology and Soil Conditions
How the ground and the site shape system behavior across heat pump types.
- Soil and geological conditions that change heat transfer
- Why identical homes can need very different loop designs
8. Heat Pump and Pipe Design
Sizing the equipment and the buried piping together.
- Integrating unit selection with loop design
9. Economics of Design
Cost, payback and the financial logic of a geothermal installation.
- Weighing installation cost against operating savings
What a Residential Geothermal Designer Does
Reading the nine headings in order reveals the actual job. A designer starts by convincing and informing (benefits), then specifies hardware (components and heat pump types), then works through a method (design process). The quantitative core follows: energy requirements and load calculations establish what the house needs, while site, geology and soil conditions determine what the ground can supply. Heat pump and pipe design reconciles the two, and economics tests whether the result makes sense for the client.
Who tends to use the credential
Typical employers and clients are geothermal installation contractors, HVAC firms adding ground source work, and design or consulting practices serving residential projects. The IGSHPA legacy paper is aimed at utility, state and provincial programs, which indicates that some incentive and rebate programs have referenced IGSHPA credentials as a quality gate. Whether a particular program still accepts the CRD is something to confirm with that program. For a view of the job market, see our overview of CRD jobs, and for the earnings question read the CRD salary guide.
Why load calculations anchor everything
Of the nine topics, load calculations is the one where a mistake is most expensive. An oversized or undersized load figure produces an oversized or undersized loop field, and ground loops are the costly, hard-to-change part of a geothermal system. Candidates preparing historically spent disproportionate effort here, and anyone practicing as a designer should treat it the same way even though no official weighting has been published for the legacy exam.
Renewal Mechanics and Fees
For existing holders, renewal is the live transaction. IGSHPA's fee policy, effective January 1, 2024, sets out the following structure for the CRD:
| Item | Member | Non-member |
|---|---|---|
| CRD renewal rate | $75 per year | $225 per year |
| Term options | 1, 2 or 3 years | 1, 2 or 3 years |
| CEU documentation | Required for processing | Required for processing |
| Individual membership (currently employed) | $125 per year, if not covered by an eligible business, community or utility membership | Not applicable |
Three details trip people up:
- CEUs are points, not hours. IGSHPA describes eight CEU points per three-year cycle. Do not confuse that with eight classroom hours.
- Membership must cover the discounted term. To use the member renewal price, your membership term has to span the renewal term you are purchasing.
- Coverage can substitute for a personal membership. If your employer holds an eligible business, community or utility membership that covers you, a separate individual membership is unnecessary.
Key Takeaway
Do the arithmetic before you renew. A three-year member renewal at $75 per year is far cheaper than the non-member rate at $225 per year, but only if your membership genuinely covers that term. Confirm coverage first, then buy the renewal.
These figures are renewal charges, not initial exam fees; no initial legacy-exam fee has been verified. For a broader pricing picture, see our CRD certification cost breakdown.
If You Are a New Candidate
Be direct with yourself about the situation. The issuer's current guidance is that legacy courses are offered case by case, mainly when a utility, state or provincial program requires them. There is no verified, open, unrestricted CRD enrollment to point you toward, and this site will not pretend otherwise.
A sensible approach:
- Check IGSHPA's Training & Certification page for what is currently offered.
- Ask whether the program, utility or regulator you work with actually requires the legacy CRD or accepts the current pathway instead.
- If the GRSD examination is the better fit, treat it as its own credential with its own rules. Do not assume GRSD fees, timers, reference rules or validity periods match anything in the legacy CRD.
Questions about whether the effort is justified are covered in our ROI analysis of the CRD, and our CRD training page covers how preparation has historically been delivered. If you want to test your general HVAC and residential-systems knowledge while you sort out your path, you can use the practice test site.
Sequencing the Material
Whether you are refreshing for a renewal-era role change or working through historical material, the nine topics build on each other in a dependency order. This is the one place where a schedule helps, and it is driven by CRD content rather than generic habit. Our CRD study guide and one-page cheat sheet provide additional review aids.
Foundations
- Benefits, system components and heat pump types
- Build vocabulary before touching numbers
The Quantitative Core
- Energy requirements, then load calculations
- Work practice problems until the method is automatic
Site and Sizing
- Site, geology and soil parameters, then heat pump and pipe design
- Tie ground conditions back to your load figures
Process and Economics
- Walk the full design process on a sample home
- Finish with the economics of design and a cumulative review
The reasoning is simple: load calculations feed site-specific loop sizing, and economics only makes sense once you have a real design to price. Reversing that order forces you to memorize results you cannot yet explain.
CRD Versus the Transition Path
| Question | Legacy CRD | GRSD upgrade path |
|---|---|---|
| Issuer | IGSHPA | IGSHPA |
| Status | Legacy; active holders can renew if they do not lapse | Optional upgrade, separate credential |
| Automatic conversion? | No renaming or replacement occurs | Requires taking the GRSD examination |
| Lapse consequences | Cannot be reinstated | Governed by GRSD's own rules, which you should verify separately |
| New-candidate access | Case by case, program-driven | Check IGSHPA's current offering |
Questions about difficulty and scoring come up often, but they cannot be answered with verified numbers for the legacy exam. Our articles on how hard the CRD exam is, the CRD pass rate and the CRD passing score explain what is and is not known. For the broader definition, see what CRD certification is.
Frequently Asked Questions
It stands for Certified Residential Geothermal Designer, a credential issued through the International Ground Source Heat Pump Association (IGSHPA) for people who design residential ground source heat pump systems.
Yes, if it is active. IGSHPA allows current holders to keep renewing with required continuing education, as long as the certification does not lapse. Renewal is offered in one-, two- or three-year terms.
According to IGSHPA's current FAQ, lapsed legacy credentials cannot be reinstated. Renew before the expiration date rather than planning to catch up later.
The current renewal products are $75 per year for IGSHPA members and $225 per year for non-members, with CEU documentation required. An individual membership for currently employed professionals is $125 per year unless an eligible business, community or utility membership already covers you.
No. Taking the GRSD examination is a separate, optional upgrade path. It does not rename or replace your CRD, and GRSD rules and fees should not be assumed to match the CRD's.