- CRD here means Certified Residential Geothermal Designer, issued through the International Ground Source Heat Pump Association (IGSHPA).
- It is a legacy credential; new enrollment is offered only case by case when a utility, state or provincial program requires it.
- Active holders can renew indefinitely with continuing education, at USD $75 per year for members or $225 per year for non-members.
- Historical course content spans nine topics, from system components and load calculations to heat pump and pipe design and economics.
What CRD Means Here
Several unrelated credentials share the acronym "CRD." This article is about exactly one of them: the Certified Residential Geothermal Designer, a ground source heat pump (GSHP) design credential associated with the International Ground Source Heat Pump Association. It has nothing to do with any other certification that happens to abbreviate the same way, and the details below (the governing body, the renewal fees, the curriculum headings) apply only to this one.
The designation signals that a person has been trained and examined in the design of residential geothermal systems: sizing the loads a home places on a system, selecting the right heat pump, and engineering the ground loop that exchanges heat with the earth. If you are searching for related phrasing, the site also covers what CRD stands for and the meaning of the CRD acronym in more detail.
A Legacy Credential: Where It Stands Today
The most important thing to understand about CRD in 2026 is that it is a legacy credential. In its January 2026 white paper on sunsetting legacy training courses and certifications (White Paper 251229, revision 260114), IGSHPA reports that normal legacy training was to be replaced by the end of 2025. That has direct consequences for anyone hoping to start from scratch.
What that means for new candidates
IGSHPA's current training and certification pages indicate that legacy courses are considered case by case and offered only when a utility, state or provincial program requires them. There is no open, unrestricted CRD enrollment you can simply sign up for. A historical signal complicates the picture: a Canadian industry association's 2025-26 course schedule advertised a virtual CRD course for late February 2026. A past schedule, however, does not prove that the session ran or that enrollment is open today. Treat new-candidate availability as unverified until you have confirmed a specific, current, issuer-approved offering directly with IGSHPA.
What that means for existing holders
Active holders are in a much better position. IGSHPA's guidance is that CRD holders may continue renewing indefinitely, provided they complete the required continuing education and do not let the certification lapse. The FAQ is blunt on the other side of that coin: lapsed legacy credentials cannot be reinstated.
| Situation | What the issuer's guidance indicates |
|---|---|
| Active CRD holder | May keep renewing with required continuing education |
| Lapsed CRD holder | Legacy credentials cannot be reinstated |
| New candidate | Legacy course offered only case by case for a program that requires it; verify before committing |
| Holder wanting a newer credential | Optional separate examination (the GRSD) is available; it is not an automatic conversion |
For requirements and eligibility questions that depend on current program rules, see CRD requirements and eligibility, and for the practical question of scheduling, CRD exam dates and scheduling.
The Nine Preparation Topics
A historical IGSHPA event listing for the CRD course online with a Canadian heating-industry partner enumerates nine preparation topics. These are curriculum headings, not an official weighted exam blueprint: no current legacy-exam question count, time limit, passing mark or initial exam fee has been verified, so nobody can honestly tell you which domain carries the most weight. What the headings do show is the shape of the knowledge a residential geothermal designer is expected to command. The full breakdown lives in the CRD exam domains guide; here is the practical view.
Domain 1: Ground Source Heat Pump Benefits
The foundation: why a homeowner would choose geothermal over conventional equipment.
- Efficiency advantages from exchanging heat with stable ground temperatures
- Comfort, operating-cost and environmental arguments a designer must articulate to clients
Domain 2: System Components
The anatomy of a residential GSHP installation.
- Heat pump unit, ground loop, circulation and distribution side
- How each component interacts with the others during heating and cooling
Domain 3: Heat Pump Types
Matching equipment configuration to the application.
- Differences between unit types and the distribution systems they serve
- Selecting a type that suits the house, the climate and the owner's priorities
Domain 4: Design Process
The sequence a designer follows from first site visit to finished design.
- Gathering information, establishing loads, selecting equipment, then sizing the loop
- Why skipping or reordering steps produces undersized or oversized systems
Domain 5: Energy Requirements
How the building's energy demand drives everything downstream.
- Seasonal heating and cooling energy needs
- The relationship between energy use and equipment performance
Domain 6: Load Calculations
The quantitative heart of residential design.
- Building heating and cooling load estimation
- Understanding how input assumptions change the results, since errors here propagate through the whole design
Domain 7: Parameters That Affect Performance, Site, Geology and Soil Conditions
The ground is not a uniform heat sink, and this domain is where candidates learn why.
- How different heat pump types respond to site conditions
- Geology and soil characteristics and their effect on heat exchange
Domain 8: Heat Pump and Pipe Design
Turning loads and site data into specified equipment and a buildable loop.
- Selecting heat pumps against calculated loads
- Sizing and configuring the piping that exchanges heat with the ground
Domain 9: Economics of Design
A technically correct design that fails financially is still a failure.
- Weighing installed cost against operating savings
- Presenting an economic case a homeowner can evaluate
Key Takeaway
The nine headings form a pipeline: benefits and components set context, loads and energy establish demand, site conditions constrain the ground side, and the equipment, piping and economics domains convert all of it into a design someone will pay for. A weakness in load calculations or site assessment undermines everything after it.
Who Holds the Credential and Why
Because the CRD is a design credential, the people who carry it tend to sit where residential geothermal projects get specified rather than only installed. Typical holders include:
- Geothermal and HVAC contractors who design the systems they install and want a recognized designation behind their proposals.
- Design-build firms and energy consultants who size residential systems and need to defend their calculations to clients and inspectors.
- Professionals working under utility, state or provincial programs that require IGSHPA certification as a condition of participation, such as incentive or rebate programs. This is exactly the context in which legacy courses are still considered.
IGSHPA frames certification and renewal as something GSHP contractors need in order to demonstrate competence, and program requirements are the main reason a legacy certification remains relevant. For a closer look at employment angles, see the page on CRD jobs, and for how the credential connects to earnings and value, read the CRD salary guide and the ROI analysis of CRD certification. Any decision about whether to pursue a legacy credential should start with whether your local program actually requires it.
Renewal Mechanics for Active Holders
For the people who already hold the credential, renewal is the whole game, and the mechanics are specific. IGSHPA's fee policy, effective January 1, 2024, lets active CRD holders buy renewal terms of one, two or three years.
| Item | Detail |
|---|---|
| Member renewal rate | USD $75 per year |
| Non-member renewal rate | USD $225 per year |
| Available terms | One, two or three years |
| Continuing education | Documentation required for processing; IGSHPA describes eight CEU points per three-year cycle |
| Individual membership (currently employed) | $125 per year, unnecessary if covered by an eligible business, community or utility membership |
Details that trip people up
- CEU points are not classroom hours. The eight-point figure per three-year cycle describes CEU points, so do not assume it equals eight hours of coursework.
- Documentation is required. Renewal processing depends on CEU documentation, so keep records of every qualifying activity as you complete it.
- Membership must cover the discounted term. To use the member rate, the membership term has to cover the certification-renewal term you are buying.
- These are renewal charges. The figures above are not initial exam fees; no initial legacy-exam fee has been verified.
For a fuller treatment of what holders and candidates may spend, see the CRD certification cost breakdown.
CRD Versus the GRSD Upgrade Path
IGSHPA's sunsetting guidance points toward a newer examination, the GRSD, as an optional upgrade path. It is important to keep the two apart. Passing the GRSD is a separate, optional step; it does not automatically rename or replace a CRD you already hold, and a CRD holder does not lose the credential by choosing not to take it.
The practical consequence for preparation is that you should not borrow GRSD objectives, timers, reference rules, exam fees or validity periods when thinking about CRD. Those belong to a different credential. If you are weighing the newer path, treat it as its own decision with its own research, and rely on IGSHPA's current training and certification pages for the rules.
Sequencing Your Preparation Around the Domains
Whether you are reviewing a legacy course you were enrolled in through a program requirement, or refreshing your knowledge ahead of renewal-related continuing education, the nine topics suggest a sensible order. The logic is dependency, not difficulty: each stage feeds the next.
Context and components
- Benefits of ground source heat pumps (Domain 1)
- System components and heat pump types (Domains 2 and 3)
Process and demand
- The design process end to end (Domain 4)
- Energy requirements and load calculations (Domains 5 and 6)
Site and equipment
- Performance parameters, geology and soil conditions (Domain 7)
- Heat pump and pipe design (Domain 8)
Economics and integration
- Economics of design (Domain 9)
- Work a full residential scenario from load to loop to payback
Load calculations and the site-conditions domain deserve the most repetition because they are where numbers and judgment meet. Practice problems that run a single scenario through every stage will teach you more than reading each topic in isolation. When you are ready for question-style practice, the CRD practice test site offers material you can work through, and the CRD study guide and CRD cheat sheet are useful companions for structured review.
One caution on expectations: because no current legacy-exam question count, time limit or passing mark has been verified, be skeptical of any source that quotes precise figures. For difficulty and scoring discussions framed around what is actually known, see how hard the CRD exam is, the CRD passing score and the CRD pass rate.
Where to Go Next
This page is the overview. Depending on what you need, these pages go deeper:
- For the terminology and definitions, see what CRD certification is and what a CRD is.
- For training pathways and how courses have been structured, see CRD training.
- For the broader certification overview, see CRD certification.
- For hands-on question practice, return to the main practice test site.
The shortest accurate summary: CRD is a respected but legacy residential geothermal design credential. If you hold it, protect it by renewing on time with documented continuing education. If you do not, verify current availability with IGSHPA before spending anything, and confirm whether your local program actually requires it.
Frequently Asked Questions
It stands for Certified Residential Geothermal Designer, a ground source heat pump design credential associated with the International Ground Source Heat Pump Association. It is unrelated to other credentials that use the same acronym.
Not freely. IGSHPA says legacy courses are considered case by case and offered only when a utility, state or provincial program requires them. Verify a specific, current, issuer-approved offering before paying anything.
Renewal terms of one, two or three years are priced at USD $75 per year for members and $225 per year for non-members. Continuing education documentation is required, and the membership term must cover the discounted renewal term.
IGSHPA states that lapsed legacy credentials cannot be reinstated. That makes on-time renewal essential, since active holders may otherwise continue renewing indefinitely with required continuing education.
No. The GRSD examination is a separate, optional upgrade path, not an automatic renaming or replacement of the CRD. Its objectives, fees and rules should not be assumed to apply to CRD.
Historical course headings cover nine areas: system benefits, components, heat pump types, the design process, energy requirements, load calculations, site, geology and soil parameters, heat pump and pipe design, and the economics of design. They are curriculum headings, not an official weighted exam blueprint.