Black Diamond Plumbing & Mechanical is a reliable heating, air conditioning, plumbing, and electrical company located in McHenry, IL. Serving the Chicago suburbs since 1999, our family-owned and operated company is friendly, reliable, and affordable to bring your home or business total comfort. Along with 24/7 heating and air conditioning repair, we also fix plumbing, electrical and sewer problems 24 hours a day, 365 days a year.