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 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 principles officers’ 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.



DSC_9324-2Precision 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 13 years experience in the development of residential, commercial and industrial HVAC systems and is a graduate from the South Dakota School of Mines and Technology. Rocky 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 VanDam  Vice President/Superintendent

Steve has worked in the HVAC industry for the last 19 years. Steve graduated from the sheet metal apprenticeship program and is a licensed journeyman mechanical contractor in South Dakota as well as Wyoming. Steve has held a superintendant role on all of the projects listed on our past performance. Prior to starting Precision Mechanical Steve was also the superintendent on such projects as the Super Wal-Mart located in Scottsbluff, Nebraska, Rapid City Regional Hospital 10th Floor Remodel Project and Security 1st Bank located in Rapid City to name just a few.