About Us


Our company founders have over 45 years of combined experience to bring to your project.


Precision Mechanical has been providing Industrial, Commercial and Residential heating, ventilation and air-conditioning design, installation and service in and around the Rapid City area since 2006. The principle partners of Precision Mechanical have over 45 years of combined experience working in the HVAC industry. Work has been performed both as a Subcontractor and as the Prime Contractor for a vast array of projects varying both in size and scope of work. The company was formed to take advantage of each of the principle partners’ expertise within their respective field of work. Precision Mechanical strives to maintain a reputation of providing professional installation and service of HVAC systems.

The company seeks to provide top quality products, service and installation in the most cost effective, timely, safe and professional manner without sacrificing quality or customer satisfaction. Each contract is looked at not as an agreement between a company and its client but, as partners trying to achieve a common goal.




Precision Mechanical services include:

  • Installation of Heating, Ventilation and Air-Conditioning (HVAC) Equipment
  • Custom Sheet Metal Fabrication and Installation
  • Indoor Air Quality Systems
  • Plan Service and Preventive Maintenance of Mechanical Systems
  • Temperature Controls
  • Mechanical System Design
  • Geothermal Heat Pumps
  • Solar Panels
  • Installation Estimates


Rocky Hamley  Owner/President

Rocky has over 18 years of experience in the development of Residential, Commercial and Industrial HVAC systems. He is also a graduate from the South Dakota School of Mines and Technology with a Bachelor of Science in Electrical Engineering Degree. He has worked as a consulting engineer in Colorado designing HVAC, Plumbing and Electrical systems for Residential, Commercial, and Industrial facilities. Upon his return to South Dakota, Rocky has worked in the construction management and design field specializing in the HVAC industry.

Steve Van Dam  Vice President/Superintendent

Steve has worked in the HVAC industry for the last 23 years. Steve graduated from the JATC Sheet Metal Apprenticeship Program and is a Licensed Journeyman Mechanical Contractor in South Dakota and Wyoming. Steve has been a Superintendent on the Featured and all of the Recent Job Projects listed below. Prior to founding Precision Mechanical, Steve was also the Superintendent on such projects as the Wal-Mart Supercenter in Scottsbluff, Nebraska, the Rapid City Regional Hospital 10th Floor Remodel Project and the Security 1st Bank in Rapid City.