Cooling Is Still a Money Problem. The Vendors Ran Out.
In an earlier post I argued that cooling is a money problem and power is a time problem: cooling gets solved inside the fence with cash and construction in months, power gets solved outside the fence with permits in years. That still holds. But three things since then, LG Electronics' Q2 call, its September 4 cooling seminar and the July lead-time surveys for cooling gear, force one amendment. The money is there. The vendors are not.
KEY TAKEAWAYS
1. LG Electronics booked about ₩600 billion (roughly $400 million at the H1 2026 average rate) of AI data center cooling orders in the first half and is targeting "several trillion won" by year-end. The same company says the market will stay supply-constrained.
2. US industry surveys put CDU and chiller lead times at 26 to 40 weeks as of July 2026, and chillers above 500 tons at 40 to 60 weeks. Cooling's clock has moved from months toward a year.
3. Nvidia's 600 kW CDU certification (July 27) is an entry ticket, not a purchase order. If the reported first volume shipment window of 2H 2027 holds, certification to delivery is more than a year.
What is confirmed, and what is only in a broker note
Start with the hard numbers. On its July 30 Q2 call, LG Electronics said first-half orders for AI data center cooling solutions had passed ₩600 billion and that it aims for a "several trillion won" project pipeline by year-end. Some coverage also quotes ₩950 billion of first-half orders; that figure is the whole HVAC business, of which AI data center cooling is the ₩600 billion slice. Do not mix the two.
On July 27 the company announced that its 600 kW coolant distribution unit (CDU) had passed Nvidia's final quality certification, the first Korean company to do so by its own account, and that it would pursue certification for 1 MW, 2.5 MW and 4 MW units in sequence. Those four items are company disclosure.
The September 4 seminar is different. The only record I have is Citi Research's seminar note, and the original sits behind a paywall. The note says the 1 MW certification is "in its final stage", the 2.5 MW and 4 MW units target certification in 2H 2026, additional capacity in Korea and the US is under review, and legacy chiller margins have historically run mid to high single digits. None of that appears in public coverage as of September 5, so I treat it as "per the broker note" and left the margin figure out of the charts.
One more correction to my own earlier framing. I wrote that cooling equipment arrives in months, and LG itself said in May that standard chillers take about six months and custom data center units about nine. But US market surveys compiled by SourceBySpec and CPMPros (July 2026, cited secondhand) show CDUs and chillers at 26 to 40 weeks and chillers above 500 tons at 40 to 60 weeks. That is a US figure and Korean procurement may differ, but the upper end has clearly crossed one year.
The value chain is moving from the chiller into the rack
The seminar's main message was direction. Most of the ₩600 billion booked so far is chillers and air handling, equipment that sits outside the building or in the plant room. LG expects rack-side products, CDUs and cold plates, to contribute a rising share of revenue from here.
Rack power density explains why. AI server racks averaged around 130 kW in 2025 (Electric Times industry survey) and Nvidia's Rubin Ultra rack, slated for 2027, is specified at 600 kW. That is well past what air can remove, so direct-to-chip liquid cooling becomes the default: a cold plate on the die, coolant circulating through it, and a CDU distributing that coolant and holding its temperature. Conceptually, LG's certified 600 kW CDU covers four to five of today's 130 kW racks.
Illustrative calculation. Not actual company figures. Racks per CDU depend on redundancy design and coolant temperature.
Hence the ladder: 600 kW, then 1 MW, 2.5 MW, 4 MW. Bigger racks need bigger CDUs. As of company disclosure, only the first step is certified. The other three are plans, and I will come back to that distinction.
Heat exits in the order cold plate, manifold, CDU, chiller. Equipment has to be installed in reverse: chiller first, then CDU, then the in-rack parts. If any one stage is late, everything on either side waits. That is why LG pitched turnkey delivery as its differentiator. Operators used to buy components from several vendors; with build schedules compressed, LG says they now prefer one integrated supplier. Its in-house fan motors, inverters and compressors are the supporting argument.
When months become a year, cooling's clock changes
The earlier framing worked because cooling was solved inside the fence and equipment arrived in months. The second condition is slipping.
Look at the supply side. The cooling equipment industry consolidated quickly over the past year. Schneider Electric took a stake in CDU specialist Motivair, Trane acquired immersion cooling company LiquidStack, and Vertiv bought European heat-rejection maker ThermoKey (company announcements and press reports). A supply chain survey found the share of operators planning to expand their supplier base fell from 50% in 2025 to 37% in 2026. Fewer sellers, concentrated in bigger hands.
Inside the CDU, pumps, brazed-plate heat exchangers and quick-disconnect couplings come from a small pool of qualified suppliers, and quick disconnects alone are quoted at 18 to 24 weeks. More CDU assemblers does not shorten lead times if the components do not scale. This is where LG's component self-sufficiency claim matters: in this market, owning the parts is owning the delivery date.
Cooling is still faster than power. A 160-week substation transformer versus a 60-week large chiller is nearly a three-to-one gap, so the original conclusion stands. What changed is that "pay and get it" has become "pay and wait a year".
Certification is the ticket. The order comes separately.
The July certification got wide coverage, but the stages need separating. Certification means the unit may be attached to an Nvidia rack. It is not an order. Carrier, Motivair and LiquidStack were reported to already hold certified products; LG is first in Korea but a follower in the market.
On orders, the company has confirmed nothing yet. An August 4 Newspim exclusive reported LG is pursuing a supply deal with one US big tech customer for up to 2,000 CDUs, with deliveries from 2H 2027 into 2028. That is an unnamed-source report and I treat it as such. But if the timeline holds, certification (July 2026) to first delivery (2H 2027) is more than a year. Industry sources note that even certified units go through customer-specific validation under actual operating conditions before volume orders.
There is a wrinkle. ZDNet Korea quoted an internal source saying Nvidia raised its spec requirement roughly twofold partway through the certification process. It is anonymous, so not a fact for this post, but it means the next rung of the ladder may sit higher than first announced. Whether the broker note's "1 MW in final stage" turns into an official announcement is the first thing to check.
What I actually watch
| Checkpoint | What it tells you |
|---|---|
| Year-end order figure in Q4 results | Whether "several trillion won" becomes a number, and how much of it is CDU versus chiller |
| 1 MW certification announcement | If it slips, the spec-raise report gains credibility |
| Q4 lead-time surveys | Shorter means capacity additions are landing; longer means the component bottleneck deepened |
| Capacity expansion decision (Korea, US) | Confirms the supply-shortage view but pressures near-term margins |
Value chain read-through
| Layer | What is changing | Indicator |
|---|---|---|
| Chillers, HVAC (building) | Bulk of current orders; lead times stretching to 40 to 60 weeks | Large chiller lead times, capacity announcements |
| CDU (row) | 600 kW certified, 1 to 4 MW planned; direct beneficiary of rack density | MW-class certifications, first volume contract |
| Cold plates, manifolds, QDs (in rack) | Concentrated supplier base; QDs at 18 to 24 weeks | Component in-sourcing progress, lead-time surveys |
| Integration, controls | Turnkey preference rising; vendor consolidation | Operator vendor-count surveys, M&A |
Risks to this view
• The seminar details come from a Citi note I could not verify against the original. Margins, capacity and certification timing may change in official disclosure.
• Orders are not revenue. Longer lead times widen the gap between booking and recognition and raise cancellation and deferral risk.
• Overseas competitors lead on both certification and references. First in Korea does not translate into global share.
• The lead-time figures are US market estimates cited secondhand. Korean project procurement may differ.
• A faster shift to immersion cooling would change the value of a CDU-centered ladder.
Bottom line
Cooling is still a money problem. But there are fewer vendors to take the money, and after they take it you wait a year. Bottlenecks move, and each time they move the clock changes. This time cooling's clock slowed by a notch.
Next post goes one layer deeper into the rack: the supply chain for cold plates and quick-disconnect couplings, small parts with long lead times.
Sources: LG Electronics Q2 2026 earnings call (Jul 30, 2026); LG Electronics release on 600 kW CDU Nvidia certification (Jul 27, 2026); Citi Research seminar note (Sep 4, 2026, paywalled); Newspim exclusive (Aug 4, 2026); ZDNet Korea (Jul 27, 2026); Dailian (May 29, 2026); SourceBySpec, CPMPros and Linesight lead-time estimates (Jul 2026, via savrn.com); The Cooling Report (Jul 7, 2026); Wood Mackenzie via Data Center Knowledge (May 4, 2026); Electric Times (Jan 30, 2026); FRED EXKOUS for the H1 2026 average KRW/USD rate (1,482).
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