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L7Midstream

Cooling

Thermal management and liquid/air cooling for high-density AI compute.

Stack position

Where Cooling sits in the AI stack

  1. L6 · AI Server

    GPU servers, racks, and storage systems integrating accelerators into deployable units.

  2. L7 · Cooling

    Thermal management and liquid/air cooling for high-density AI compute.

  3. L8 · Data Center

    Hyperscale and colocation facilities, datacenter REITs, and the construction that builds them.

  4. L9 · Cloud

    Hyperscale cloud platforms renting general compute, storage, and managed services.

Icons mark layer roles — not company logos. Position only; not a price chart.

Why this layer matters

Air cooling was adequate when racks drew tens of kilowatts. Rising accelerator power raises rack density, which raises heat, which forces liquid: cold plates, CDUs, immersion, pumps, heat exchangers. This is its own thermal infrastructure industry, not a line item under datacenter equipment.

What is the bottleneck?

Retrofitting an air-cooled facility for liquid is a construction project, not an upgrade. Existing datacenter stock is a real limit on where dense racks can go.

A structural observation about supplier concentration and lead times — not a view on any security.

Who sits in this layer?

  • Company

    VRTPrimary business sits here

    Datacenter thermal management, including liquid cooling and CDUs.

    Stock research

  • Company

    MODPrimary business sits here

    Thermal management systems, including datacenter cooling.

    Stock research

  • Company

    TTAdjacent / mixed

    HVAC broadly across buildings and transport; datacenter cooling is one segment.

    Stock research

  • Company

    JCIAdjacent / mixed

    Building systems and HVAC broadly; datacenter cooling is one segment.

    Stock research

Weekly digest: AI-map layer changes and new public 13F filings, each with its source. No score, no grade, no trade signal. Unsubscribe anytime.

Coverage boundary

Coverage boundary: US-listed tickers or ADRs only (same rule as TSM / ASML). Important suppliers without a US listing are omitted even when they matter to the stack. That is a coverage rule, not a quality ranking.

No hand-listed notable omissions for this layer yet. The US-list / ADR rule still applies.

Checked 2026-10-09. Not exhaustive.

Same track

L1 Power Infrastructure

Descriptive positioning only. The positioning label says whether a company's business is exposed to a layer, never whether to buy it. Layers with no exposure are not recommendations to add any.