MAS SERVICE operating as a corporation is licensed in California under CSLB number 498289. The license was first issued in 1986, putting the business at 40 years on the active CSLB roster. It carries 2 CSLB classifications: C-20 HVAC Contractor and C-38 Refrigeration Contractor. Records show an active surety bond on file with OHIO CASUALTY INSURANCE COMPANY (THE) and active workers' compensation coverage from INSURANCE COMPANY OF THE WEST. The business is based in ANTIOCH, in Contra Costa County, California.