ChamberMaster Template Falls Mechanical Plumbing Falls Mechanical Visit Website Request Info 600 2nd Street South Great Falls, Montana 59405 (406) 452-3826 (406) 452-3886 (fax) Hours: 8am to 5pm, Monday through Friday. Service dept for after hours emergencies. About Map About We specialize in Commercial and Residential Plumbing and HVAC projects. We have a Service Department as well for any HVAC or Plumbing issues. What's Nearby? Distance: 5 10 15 20 25 50 mi.