- What the CRD Credential Actually Is
- Legacy Status: What Changed and Why It Matters
- New Candidates: Verify Before You Plan
- The Nine Preparation Topics in Depth
- Renewal Mechanics for Existing Holders
- Transition Guidance: CRD Holders and the GRSD Path
- Who Uses a Residential Geothermal Designer Credential
- A CRD-Specific Preparation Sequence
- Frequently Asked Questions
- CRD means Certified Residential Geothermal Designer, issued through the International Ground Source Heat Pump Association (IGSHPA).
- IGSHPA reports normal legacy training was replaced by the end of 2025; active holders can keep renewing if they never lapse.
- Renewal costs $75 per year for members or $225 per year for non-members, in one-, two- or three-year terms.
- New enrollment is on verification hold: confirm a specific current issuer-approved legacy offering before planning around it.
What the CRD Credential Actually Is
CRD stands for Certified Residential Geothermal Designer. It is an IGSHPA credential aimed at professionals who size and design ground source heat pump (GSHP) systems for homes. IGSHPA documents the abbreviation and full title explicitly in its January 2026 white paper on sunsetting legacy training and certifications. If you are searching for the meaning of the acronym, our explainers on what CRD is and what CRD stands for cover the naming question in more detail.
The point worth stressing at the outset: this credential is about residential ground-coupled heating and cooling design. Residential geothermal design is its own discipline. It blends load calculation, equipment selection, ground heat exchanger sizing and economics. A designer who gets any one of these wrong ends up with a system that underperforms, costs too much to install, or both.
Legacy Status: What Changed and Why It Matters
This is the part most older articles about the credential get wrong, because they were written when the CRD course was a routine, open-enrollment offering. IGSHPA's white paper (White Paper 251229, revision 260114, dated January 14, 2026) describes the sunsetting of its legacy training courses and certifications. The paper reports that normal legacy training was replaced by the end of 2025.
For a reader, three consequences follow.
- Existing holders are not stranded. Active CRD holders may continue renewing indefinitely, provided they complete required continuing education and their certification does not lapse.
- Lapse is permanent. IGSHPA's current FAQ states that lapsed legacy credentials cannot be reinstated. A missed renewal is not a paperwork inconvenience; it ends the credential.
- The GRSD exam is a separate path. Taking the GRSD examination is an optional upgrade route. It is not an automatic renaming or replacement of CRD, and holding CRD does not convert you into a GRSD holder.
Key Takeaway
Treat CRD as a legacy credential with a living renewal path. If you hold it, protect it from lapsing. If you do not, do not assume you can simply sign up for it.
New Candidates: Verify Before You Plan
If you are a prospective candidate, the honest answer about availability is "verify first." IGSHPA's Training & Certification page indicates that legacy courses are considered case by case and are offered only when required by a utility, state or provincial program. That is a very different situation from an open catalog where anyone can register.
Conflicting signals exist in the wild. For example, the Heating, Refrigeration and Air Conditioning Institute of Canada (HRAI) advertised a virtual CRD course for February 24-26, 2026 in its 2025-26 courses schedule. A published schedule, however, does not prove the session ran or that enrollment is open today. An earlier IGSHPA event listing for a February 26-27, 2025 online CRD course with HRAI is likewise historical.
For eligibility questions, our CRD requirements guide and the broader what is CRD certification overview are the right starting points. Be aware that general-purpose pages may describe the program as it existed before the sunsetting.
The Nine Preparation Topics in Depth
The historical IGSHPA course listing organized CRD preparation around nine topic headings. These are curriculum headings, not weighted exam domains. No current legacy-exam question count, time limit, passing mark or initial exam fee has been verified, so nothing here should be read as an official blueprint or as a statement about which topic carries the most weight. What follows is what a designer needs to understand under each heading. For a heading-by-heading breakdown, see the CRD exam domains guide.
1. Ground Source Heat Pump Benefits
Why GSHPs outperform conventional equipment, and how to communicate that honestly to a homeowner.
- Efficiency advantage from exchanging heat with stable ground temperatures
- Comfort, noise and maintenance considerations
- Environmental and operating-cost arguments, framed without overpromising
2. System Components
The pieces of a complete residential GSHP installation and how they interact.
- Heat pump unit, ground loop, circulating pumps and flow centers
- Distribution side: ductwork or hydronic emitters
- Controls and domestic hot water integration options
3. Heat Pump Types
Distinguishing the equipment categories and when each fits a project.
- Water-to-air versus water-to-water machines
- Single-stage, multi-stage and variable-capacity concepts
- Matching equipment type to the home's distribution system
4. Design Process
The sequence a designer follows from first site visit to final specification.
- Gathering building, site and owner information
- Sequencing load, equipment and loop decisions so each step informs the next
- Documenting assumptions for installers and inspectors
5. Energy Requirements
Translating building demand into seasonal energy use.
- Heating and cooling energy versus peak capacity
- Effect of climate on annual operating hours
- Auxiliary and backup heat considerations
6. Load Calculations
The foundation of every sizing decision.
- Heat loss and heat gain calculated from envelope, infiltration and design temperatures
- Why rule-of-thumb sizing leads to oversized or undersized systems
- Using results to select equipment capacity
7. Parameters Affecting Performance: Site, Geology and Soil Conditions
Why the same house can need very different loops on different lots.
- Soil and rock thermal properties, moisture and groundwater
- Undisturbed ground temperature and its regional variation
- Available land area and how it constrains loop configuration
- How each heat pump type responds to entering water temperature
8. Heat Pump and Pipe Design
Where load, equipment and ground conditions become a buildable loop.
- Sizing the ground heat exchanger for the calculated loads
- Pipe selection, flow rates and pressure-drop awareness
- Horizontal, vertical and other loop approaches and their trade-offs
9. Economics of Design
Whether the system makes sense financially for this particular owner.
- Installed cost versus operating savings
- Incentives, financing and payback framing
- Comparing alternatives honestly rather than defaulting to the largest system
Notice how the topics chain together. A weak load calculation (topic 6) corrupts equipment selection (topic 3) and loop sizing (topic 8), and the economics (topic 9) then reflect the error. A designer who understands this dependency chain will find the material more coherent than one who treats the nine headings as isolated lists.
What question style to expect from historical material
Because no current legacy-exam format was verified, avoid relying on any claim about question counts or timing. What can be said is that the listing tied certification to passing the corresponding examination, and that the subject matter is applied: you calculate, size and select rather than merely define. Practice that mirrors real design reasoning, such as working through a load and following it to a loop length, serves the material better than memorizing glossary terms. Our difficulty guide and passing score page discuss what is and is not known about scoring.
Renewal Mechanics for Existing Holders
For people who already hold the credential, renewal is the live, practical topic. IGSHPA's fee policy took effect January 1, 2024, and current CRD renewal products are sold separately for members and non-members.
| 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 |
| Example 3-year total | $225 | $675 |
| Documentation | CEU records required for processing | CEU records required for processing |
These figures are renewal charges, not initial exam fees. For a fuller treatment of how the money works, see the CRD certification cost breakdown.
CEUs and the three-year cycle
IGSHPA describes eight CEU points per three-year cycle. Be careful here: that is eight CEU points, not eight classroom hours. Confirm with IGSHPA how a given course or event converts to points before you pay for it, and keep the paperwork, because documentation is required for processing the renewal.
Membership must line up with the discount
The membership term must cover the discounted certification-renewal term. If you buy a three-year member-priced renewal, your membership has to cover that same stretch. Individual membership for currently employed professionals costs $125 per year. If your employer holds an eligible business, community or utility membership that covers you, a separate individual membership is unnecessary.
Transition Guidance: CRD Holders and the GRSD Path
IGSHPA's replacement credential line uses the GRSD examination. Keep three principles straight when thinking about transition:
- It is optional. Nothing in the sourced material says a current CRD holder must take GRSD to keep the CRD.
- It is separate. GRSD has its own objectives, fees, rules and validity terms. Do not apply anything from the GRSD program to CRD, and do not assume the reverse.
- It is a career decision. Some employers, utilities or programs may prefer or require the newer credential over time. Ask the programs relevant to your market rather than guessing.
Whether holding on to the legacy credential makes sense is a cost-benefit judgment. Our worth-it analysis walks through the reasoning, and the salary guide addresses earnings in qualitative terms.
Who Uses a Residential Geothermal Designer Credential
The people who benefit most from a designer-level GSHP credential tend to fall into a few groups:
- HVAC contractors expanding from conventional equipment into ground-coupled systems and needing credible design capability.
- Dedicated geothermal designers and installers who size loops and specify equipment for homeowners.
- Utility and program staff who administer rebates or incentive programs that reference IGSHPA credentials.
- Building-performance and energy consultants who advise on heating and cooling decisions in homes.
Because legacy courses are offered mainly where a utility, state or provincial program requires them, program requirements can be the single biggest driver of whether a given professional encounters this credential at all. For the employment angle, see CRD jobs and CRD training.
A CRD-Specific Preparation Sequence
If you are reviewing for an issuer-approved offering you have already verified, sequence your work by dependency rather than by the order the headings appear. Design knowledge compounds: loads feed equipment, equipment feeds loops, loops feed cost.
Foundations
- Benefits, components and heat pump types
- Draw a one-page system diagram from memory
Loads and Energy
- Work several heat loss and heat gain calculations by hand
- Connect peak load to seasonal energy requirements
Site and Geology
- Study how soil, rock, moisture and ground temperature change loop needs
- Compare how two sites would alter the same house's design
Loop Design and Economics
- Size a loop from a completed load calculation
- Finish with a full design process run-through and a cost comparison
For a broader plan, the CRD study guide and the CRD cheat sheet are useful companions, and you can run practice questions on the main practice test site. Be sure whatever you practice is clearly framed as preparation, since no current legacy-exam blueprint has been verified.
Key Takeaway
Spend your hardest study hours on load calculations and site conditions. Every downstream decision, from equipment to loop length to payback, inherits whatever error you introduce there.
Frequently Asked Questions
Treat new enrollment as unconfirmed. 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 planning. See the CRD exam dates page for scheduling context.
Active holders may keep renewing indefinitely with the required continuing education, but the credential must not lapse. IGSHPA states that lapsed legacy credentials cannot be reinstated, so renew on time and keep your CEU documentation.
Current renewal products are $75 per year for members and $225 per year for non-members, available in one-, two- or three-year terms. Your membership term must cover the discounted renewal term, and individual membership for employed professionals is $125 per year unless an eligible employer or utility membership already covers you.
IGSHPA describes eight CEU points per three-year cycle. These are CEU points, not eight classroom hours, and documentation is required for processing. Confirm point values for any course with IGSHPA before you register.
No. GRSD is a separate, optional upgrade path, not an automatic renaming of CRD. It has its own requirements, so do not assume its fees, timing or validity apply to your legacy credential. For fundamentals on the CRD itself, read CRD meaning.