Introduction: McQuillan Bros. Plumbing, Heating & AC is the premier resource for all things plumbing or HVAC related in St. Paul and surrounding areas. They offer drain cleaning, water heater installation and repair, frozen pipe repair, furnace and boiler repair, AC installation and repair, emergency services and more. For top-quality plumbing and HVAC services, call the best in the business at McQuillan Bros. Plumbing, Heating & AC.