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 

Watsco, Lennox and Carrier should see a big HVAC maintenance and replacement cycle next season because air conditioners are running hard. Even people who rarely use AC are using it, and regular users are using it heavily, so weak new construction is no problem. x.com 

Comfort Systems' solid execution is a reason to hold despite a rich valuation, because selling a long-term winner on valuation alone rarely works. Long-term gains taxes of up to 37.1% in California mean the stock must fall a lot just to rebuy the same shares, and re-entry timing is uncertain. Some who sold it on valuation saw it rise 2-3x, so even a 50% crash would leave it above their exit. Only a material, lasting change in the long-term thesis justifies selling, not quarterly noise. x.com 

Legence is a comforting company to own after a second quarter as a shareholder, a junior version of Comfort Systems USA in the portfolio. x.com 

Data center cooling stocks lose as NVIDIA's Vera Rubin chips need no chillers. Per @HedgieMarkets, Jensen Huang said Rubin can be cooled with 45°C water, sending Johnson Controls down 6.2%, Modine 7.4%, Trane 4% and Carrier nearly 1%; the chips ship in the second half of 2026. With NVIDIA reporting $1 trillion of Blackwell and Rubin orders through 2027, AI capex is doubling, and on an Elliott Wave view the cooling stocks may be starting their own wave 3 to the downside. x.com  x.com 

Comfort Systems USA remains a bullish holding, reaffirmed here with a shared link and no new argument. x.com 

Comfort Systems USA is the more stable long-term holding than Vertiv, with an HVAC business available across the country and better fundamentals, so it merits about twice the position size, though both are worth owning. x.com 

Comfort Systems USA benefits from a shortage of everything, above all workers. Anyone who has renovated a house lately sees there are no tradespeople around in any Western country, and the shortage is getting worse. x.com 

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 

Record data-center construction supports Sterling Infrastructure, Quanta Services, Comfort Systems USA, Vertiv and Argan. Per The Kobeissi Letter, US data-center construction spending jumped 46% YoY in June to a record $68 billion annualized rate, up 158% since January 2024, and now exceeds office construction by a record $25 billion. Kobeissi calls AI the driver of the biggest investment wave in US history. x.com