Licensed Master Plumber Sherman Plumbing & Heating has the experience and expertise to get the job done right the first time. Our skilled professionals use only the finest tools and materials to fix your ac unit, or diagnose problems with your boiler. We guarantee our work and your satisfaction. We're glad you're here and hope to hear from you soon. License master plumber st vt, license journeyman plumber st. MA , license master sheetmetal worker st. MA, License fire sprinkler fitter ST. MA.