Randazzo Heating, Cooling, and Fireplace Sales in Shelby Township offers FREE estimates! Visit our showroom and see the latest in fireplace design. Go with the name you know - Randazzo. We offer 24 hour service, 7 days a week! Serving All of Metro Detroit. Financing options to make your purchase easy and comfortable. Randazzo Mechanical is a family-owned, Michigan-based company in operation since 1988.