Comfort Systems, MasTec and Quanta Services are hidden champions of the physical build-out behind AI data centers and US reshoring. Tech giants' data centers need massive cooling and electrical infrastructure, which Comfort Systems builds; it is up 500% from its lows. MasTec and Quanta build the power lines, water lines and pipelines for a factory boom funded by the Chips Act and Inflation Reduction Act. They rarely make headlines but are booked out for decades and quietly outperforming. x.com 

AAON is quietly turning from a traditional HVAC maker into an AI infrastructure play through data center cooling, as the AI capex bottleneck shifts beyond compute to cooling and power. This quarter it beat EPS estimates by 64% and revenue by 30%, raised FY26 revenue growth guidance to 40-45%, and posted a record backlog with improving margins. An 18-month weekly base, a high-volume earnings gap and strong institutional buying add to the case. It is overlooked next to Vertiv and Modine. x.com 

Comfort Systems USA, a contractor installing HVAC and electrical systems inside AI data centers, trades at nearly twice Nvidia's forward earnings multiple, even though Nvidia's chips and CUDA ecosystem made the entire buildout possible. x.com