Quality Air Services (Chase Contracting Inc.)
San Leandro, CA | 94577
Quality Air Services (QAS) is a San Leandro–based company that has provided commercial HVAC system cleaning, restoration, inspections, and indoor air quality testing across the West Coast for over 30 years. Serving sectors such as healthcare, education, manufacturing, laboratories, and government, QAS is certified by NADCA and IKECA and operates as a CA Local 104 Union Shop. Licensed, bonded, and equipped for projects of any size, QAS emphasizes maintaining clean and healthy environments through professional and compliant HVAC services.
Blocka Construction Company Inc.
Pleasanton, CA | 94566
Blocka Construction Company Inc. (Blocka Construction Inc.) is a Pleasanton, CA‑based general engineering and mechanical contractor with industrial electrical, sheet metal/mechanical, and general engineering divisions. They carry out large‑scale projects, including water/wastewater treatment plants, transit infrastructure, automotive and food manufacturing facilities throughout Northern California.
Best Contracting Services (Best Roofing & Waterproofing)
Union City, CA | 94587
Best Contracting Services, Inc., founded in 1982 and headquartered in Gardena, California (with additional facilities in Union City and Woodinville, WA), is a specialty contractor delivering full building envelope services- including roofing, waterproofing, sheet‑metal fabrication, and glazing- for commercial, institutional, industrial, and public-sector clients.
Bel Air Mechanical Inc.
Oakley, CA | 92253
Bel Air Mechanical, Inc. is a privately held HVAC and architectural sheet metal contractor that delivers commercial mechanical construction, HVAC controls, and maintenance services across the San Francisco Bay Area. The company also handles design‑build projects, tenant improvements, air purification, and pathogen mitigation with a strong focus on customer satisfaction and energy efficiency.