Comfort Systems USA (NYSE: FIX) has returned more than 2,000% over the past five years, while Nvidia's return is just under 1,000%. Here's how this HVAC company did it. Why Comfort Systems outperformed NvidiaFive years ago, Comfort Systems was a relatively overlooked mid-cap mechanical, electrical, and plumbing (MEP) contractor with a market capitalization under $3 billion. Comfort Systems became a key beneficiary of the physical AI supply chain. Comfort Systems is now a large-cap stock in the S&P 500 with a $59 billion valuation, making 2,000% share price growth more difficult.