 HOUSTON--BUSINESS WIRE--Comfort Systems USA, Inc. NYSE: FIX, a leading provider of commercial, industrial and institutional heating, ventilation, air conditioning and electrical contracting services, today announced that its Board of Directors has approved an amendment to the Companys stock repurchase program to increase the shares authorized and remaining as available to purchase back up to 1,000,000 shares by authorizing the Company to acquire up to 745,582 additional shares of its outst 