Johnson Controls International plc — AI supply-chain exposure

A building-technology group best known for HVAC and controls, whose York-brand chillers and applied cooling systems have become core equipment inside hyperscale data centres. As AI racks pack more power into each square foot, the heat they throw off becomes a first-order engineering problem — and Johnson Controls supplies the large mechanical plant, chillers, and increasingly liquid-cooling gear that carries that heat away. Data-centre orders have become a major driver of its backlog.

Its structural hook is that cooling is no longer optional plumbing but a gate on how much compute a site can host. Dense AI hardware cannot run without it, which gives established suppliers of applied thermal systems durable demand and repeat service revenue. The model places it as a supplier one layer removed from the silicon — unglamorous, but sitting on a bottleneck that scales directly with rack density and power draw.