As Minnesota’s Original plumbing and HVAC contractor, McQuillan Bros is a Minneapolis and St. Paul mainstay. The family-owned company has served Ramsey, Hennepin and Washington counties for 135 years, remaining true to its mission of providing rock-solid, honest work at fair, upfront pricing. Trust McQuillan Bros for superior heating, AC, plumbing and boiler service, 24/7/365.