Construction and home maintenance company Comfort Systems USA (FIX 11.46%) reported better-than-expected quarterly results and provided an upbeat outlook about the future. Investors are taking notice, sending shares of Comfort Systems up as much as 18% on Friday and up 9% as of noon ET.Strong growth is fueling investor enthusiasmComfort Systems is a rollup of commercial, industrial, and institutional heating, ventilation, air conditioning (HVAC) and electrical contracting services. The company earned $2.55 ...