Fabrication | General Heating and Air Conditioning


General Heating and Air Conditioning’s sheet metal fabrication shop is an 18,000 square foot climate controlled work space.

Our shop is the largest in the area, giving us additional capacity to produce more of our own ductwork where we control the quality. Our shop strictly adheres to SMACNA (Sheet Metal and Air Conditioning Contractors National Association) construction standards, which ensures that the owner will receive a quality sheet metal installation. Our prefabrication procedures go the extra mile to ensure tight duct construction and expedited job site installation. Ducts are leak tested before they leave our shop to prevent air leakage and to decrease power requirements to move air through our ducts.

Our fabrication shop includes the following pieces of equipment and we are continuously searching for new equipment, tools and approaches that help reduce cost, improve efficiency, and support our quest for design innovation:

  • Plasma duct automated duct-cutting machines (2)
  • TDC roll formed duct flange machine
  • Spiral round duct fabrication machine
  • Automated corner connector system
  • Fully automated 6 foot wide coil line
  • Ovalizer to stretch spiral pipe in to flat oval duct


Our sheet metal shop is complemented by our steamfitting fabrication facility at our parent company. At 9,000 square feet, this shop is also the area’s largest. Union steamfitters use standard and advanced welding technology that includes:
  • Gas Tungsten Arc Welding (GTAW)
  • Gas Metal Arc Welding (GMAW)
  • Shielded Metal Arc Welding (SMAW)
  • Copper and VAV Box Prefabrication
  • PPR and HDPE Fabrication


We have access to over 95 qualified welding procedures through our membership with the National Certified Welding Bureau, enabling us to fabricate pipe with a wide variety of materials. Our shop carries four stamps in compliance with A.S.M.E. code for work on pressurized vessels. Utilizing state of the art materials and equipment, the pipe fabrication shop improves our efficiency and productivity on projects of all sizes.

The combined capacity of our fabrication shops, coupled with our experienced labor force, give us a productivity edge in this market. We continuously investigate, explore, and develop new approaches, applications, and techniques that result in cost-savings, improved efficiency, and enhanced aesthetics.


We’re Hiring!

General Heating and Air Conditioning is currently hiring a project manager/engineer, a service manager, and a service parts coordinator. Located in Madison, Wisconsin, our team is filled with talented individuals, and we are looking to add to our growing team.

..read more ›

Project Update: Hamel Music Center

The Hamel Music Center is a nearly $56 million facility that will fill an entire open space immediately adjacent to the Chazen Museum of Art.

..read more ›

GHAC Continues Work in Portage County with Sentry Insurance’s New 8-Story Building

When GHAC secured the Sentry Insurance project in Stevens Point, it marked the second project GHAC has worked on in Portage County (the first was the UW-Stevens Point Chemistry Building).

..read more ›