Geothermal Site Assessments for Any US Address
Ground thermal conductivity, heat capacity, diffusivity, undisturbed ground temperature, and aquifer flow — computed from 23M real well-drilling records, with an explicit uncertainty range on every estimate. Then size the ground loop without leaving DrillerDB.
$149/month add-on on any plan · 14-day free trial
One assessment: the consensus formation column from nearby logged wells, with conductivity resolved layer by layer.
- 23M
- well records behind every estimate
- 114
- blind thermal-response back-tests
- 17
- states in the public benchmark
- 32 / 41
- in range where real well control exists
What is already out there
We went looking for this tool before we built it
We could not find another nationwide, address-level ground thermal conductivity estimator anywhere in the published prior art. National screening tools fall back on climate-zone defaults for the subsurface. Address-level tools exist only city by city. Geology-derived conductivity maps top out at 1:250,000 scale — and mostly outside the US.
The industry's own design tools ask you to bring a drill log and average it by hand. DrillerDB brings the drill logs — 23 million of them.
How it works
Address in, defensible numbers out
- STEP 01
Enter an address
Enter any address or coordinates. The engine finds nearby logged wells, builds a consensus lithology column, and splits it at the local water table.
- STEP 02
Every layer gets published values
Each layer gets published literature conductivity and heat-capacity values (VDI 4640, Banks, Fuchs & Forster), thickness-weighted into effective properties - deterministic, reproducible, never AI-guessed numbers.
- STEP 03
Report out, loop design in one click
You get a professional PDF report with an uncertainty range and confidence grade - and one click seeds a ground-loop design sized by GHEDesigner, the open-source sizing engine from the same Oklahoma State University research group behind GLHEPRO.
In every assessment
What you get
Thermal conductivity estimate
An effective ground conductivity value for the borehole depth you plan to drill, published with an uncertainty band and a confidence grade tied to how much well coverage the site actually has.
Full subsurface profile
The consensus formation column behind the number, plus a per-layer table showing thickness, lithology, and the conductivity and heat-capacity values applied to each interval.
Aquifer flow and static water
Static water level statistics and groundwater flow context from the surrounding wells - the variable that separates a conduction-only design from one carrying advective heat transport.
Undisturbed ground temperature
The far-field ground temperature your loop entering-water temperatures swing around, reported alongside heat capacity and thermal diffusivity for the same column.
Ground-loop design tool
Size the borefield without leaving DrillerDB. GHEDesigner-based sizing, borefield layout options, and PDF design reports seeded straight from the assessment.
TC test logging
Log the formation thermal-conductivity tests you already pay for. Measured results anchor future estimates near your logged sites, so the tool sharpens where you work most.
Blind back-test
32 / 41
Measured conductivity inside the stated range, on sites with real logged lithology
- 78%
- in-range rate, real-control sites
- 21.5%
- mean absolute error
- 114
- logged TRT sites
- 17
- states covered
We tested it against real thermal-response tests
We assembled a benchmark of 114 publicly logged thermal-response tests across 17 states — spanning humid, arid, and mountain regimes — and ran the engine against all of it blind: no tuning, every site reported. We quote accuracy only where the engine had real logged lithology to work from. On those 41 sites, across 15 states, measured conductivity fell inside the report's stated range at 32 of 41 (78%), with a 21.5% mean absolute error — and when the engine misses, it usually misses low, the conservative direction for a loop design. Doubling the real-control benchmark from 21 to 41 sites left measured accuracy essentially unchanged. Where coverage is thin, the report says so instead — a wider range and a lower confidence grade, not a dressed-up guess.
Where this fits
This is not a replacement for an on-site thermal-response test. It tells you whether a site is worth testing, and gives designers a defensible starting number where no test will ever be run. A formation TC test runs $8,000-$12,000 per borehole and takes a week or more from spudding to a number; run it on the sites that deserve it.
Geothermal add-on
$149/month
Flat, on any DrillerDB plan. Included in the 14-day free trial.
What the add-on includes
- 300 assessments per month (fair use)
- Unlimited ground-loop designs
- TC test logging
- PDF report and design exports