Street banner welcomes Comfort Systems USA, CRH and Carvana to the S&P 500, signaling index inclusion and market gains. Key Points Comfort Systems USA, Carvana, and CRH will be added to the S&P 500 Index on Dec. 22. Comfort Systems and CRH are benefiting from increased data center demand, while Carvana is gaining significant market share from CarMax. Index inclusion could lead to short-term stock price boosts due to increased demand from S&P 500 tracking funds. Interested in Comfort Systems USA, Inc.? ...