SMACNA of San Diego on Parkway Drive in La Mesa is the regional chapter of the Sheet Metal and Air Conditioning Contractors' National Association, representing signatory sheet metal and HVAC contractors across San Diego and Imperial Counties since its IRS ruling year of 1971. Member contractors perform architectural sheet metal fabrication, HVAC system installation, and industrial ventilation work—the same trade disciplines practiced by La Mesa HVAC firms like Hamel's Air Conditioning & Heating Inc. As a trade association, SMACNA of San Diego negotiates labor agreements, administers joint apprenticeship training with the sheet metal workers' union, and represents the industry in regional government and public affairs. The chapter's signatory contractors operate under SMACNA's nationally published technical standards for duct construction, seismic bracing, and energy conservation—specifications also referenced by independent HVAC operators like CoolCosmos HVAC in the La Mesa market. Registered under EIN 23-7163847, the chapter's scope of work extends to welding, testing, adjusting, and balancing of air handling systems, and its contractor members are qualified for prevailing-wage public projects under California Department of Industrial Relations standards.