Client Stories

Voices from the Field

Min-jun H. — Yeongdeungpo basement, 0.08 EH/s cabinet

The outlet water stayed under 42°C through August. Their report flagged a marginal pump curve — we swapped it before go-live and avoided a weekend of throttled hash rate. Commissioning ran four days because our shut-off valve was sticky; they did not charge extra for the extra hour waiting on a plumber.

Service: Hydro cabinet commissioning · Year: 2024

Sandra K. — Incheon warehouse bay, 0.12 EH/s dual loop

Building water pressure dipped after 11 p.m. They logged it across two nights and helped us negotiate a small booster with the landlord. Hash rate stable once the booster was in. I would have liked the audit report a day sooner, but the data was thorough.

Service: Site thermal audit + commissioning · Year: 2025

Park family operation — Busan, two 0.06 EH/s units

Coolant chemistry checklist was the highlight — we had been topping up with the wrong inhibitor ratio. Quarterly maintenance is worth it; one visit caught a weeping quick-connect we would have missed. Booking around Lunar New Year was slow — plan ahead.

Service: Coolant loop maintenance contract · Year: 2023–2025

Han Logistics property team — Daegu mixed-use lower floor

We needed a neutral report for upstairs tenants worried about heat and noise. Thermal imaging photos in the commissioning pack made the tenant meeting easier. No marketing fluff — just temperatures and decibel readings at the property line.

Service: Commissioning with landlord witness · Year: 2024

Extended Account: Warehouse Bay Conversion

Client: Sandra K., logistics property investor
Site: Incheon, ground-floor bay under office floors
Hardware: Imported 0.12 EH/s hydro cabinet, dual heat exchanger
Challenge: Municipal water pressure fluctuated; office tenants above sensitive to overnight pump noise.

Sandra shortlisted two cabinet models after reading manufacturer brochures that assumed stable 24-hour pressure. Appsequoiafield ran a site thermal audit first: portable logging on the proposed tie-in, boundary noise with a test pump, and heat rejection modelling for summer design conditions.

The audit returned conditional — hydro cooling was viable with a booster and acoustic wrap on the pump skid, not a fail. Sandra used the memo in landlord negotiations; the booster cost less than the air-cooled ducting alternative she had been quoted.

Commissioning followed two weeks after cabinet delivery. Burn-in showed hash-rate variance under 1.2% once the booster was active. The final report included pump vibration readings at the property line — 38 dBA at 1 m, below the lease threshold Sandra needed.

Outcome: Cabinet operating since spring 2025; bi-monthly maintenance contract for the first year because of dust from nearby loading bays.

Client note: “Pressure logging at night was inconvenient — technicians had to come twice — but it saved us from blaming the cabinet when the building was the issue.”

Extended Account: Basement Cooperative

Client: Min-jun H. and two partners
Site: Residential-adjacent basement, Yeongdeungpo-gu
Hardware: 0.08 EH/s single-loop cabinet
Challenge: Tight clearance behind the cabinet; landlord cap on outlet water temperature.

Partners had already purchased the cabinet before calling us. Commissioning focused on verifying the landlord’s 45°C outlet limit. Loop delta-T and thermal images of the heat exchanger face were documented hourly during burn-in.

A factory pump showed marginal head at peak flow; partners approved an OEM swap on our recommendation before signatures on the report. Landlord received a one-page summary without hash-rate jargon — only temperatures and noise.

Outcome: Operating approval signed; partners later booked quarterly maintenance.

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