Davis Mechanical Systems (DMS) provides mechanical contracting and plumbing services in the greater Minneapolis/St.Paul Minnesota area. DMS (formerly known as the Whelan-Davis Company ) is a privately owned company that specializes in the design, installation and servicing of refrigeration, heating and air conditioning systems as well as a full service commercial and industrial plumbing practice.DMS brings to the HVACR and plumbing field a team of experienced and dedicated pipefitters and plumbers, state of the art equipment, tools and trucks, as well as 24 hour access to our service department. The values of hard work, integrity and timely, efficient work are central to our company's beliefs/philosophy.