- 1939 Wangsgaard was established by Reed Wangsgaard.
- 1985 JM Mechanical was established by Jay Jenks.
- 1997 JM Mechanical joined forces with Service Experts to form JM Mechanical Service Experts.
- 2001 Wangsgaard joined the team of JM Mechanical Service Experts to form the largest Heating & Air Conditioning Company in Northern Utah.
- 2004 the previous owners purchased back JM Mechanical/Wangsgaard from Service Experts.
- 2010 JM Mechanical expands services to include a full service plumbing department.