Geothermal Site Assessments for Any US Address
Ground thermal conductivity, heat capacity, diffusivity, undisturbed ground temperature, and aquifer flow — computed from 18M+ 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.
- 18M+
- well records behind every estimate
- 21
- blind thermal-response back-tests
- 18 / 21
- measured values inside our range
- -3.9%
- average bias across the set
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 — 18 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
18 / 21
Measured conductivity inside the stated range
- 86%
- hit rate
- -3.9%
- average bias
- 21
- logged TRT sites
- 13
- states covered
We tested it against real thermal-response tests
We blind back-tested the engine against 21 publicly logged thermal-response tests across 13 states, spanning humid, arid, and mountain regimes. The measured conductivity fell inside the report's stated range at 18 of 21 sites (86%), with near-neutral average bias (-3.9%). Ranges are site-specific — wider where well coverage is sparse — and every report carries a confidence grade.
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