O.C. McDonald Co., Inc. is a full-service mechanical contractor based in San Jose, CA, serving the greater Silicon Valley area. The company specializes in HVAC installation, plumbing, process piping, and building automation systems for commercial new construction, retrofits, and residential projects. With over 100 years of experience since 1906, they offer comprehensive design, installation, and 24-hour emergency service through a live operator to address urgent needs promptly.

Dukes Heating & Air Conditioning is a family-owned HVAC company serving Fremont, CA, and surrounding areas. Since 2005, they have provided repair, installation, and maintenance services for residential and light commercial heating and cooling systems. Their experienced team handles furnace repairs, heat pump installations, and HVAC tune-ups, ensuring year-round comfort. The owner has been in the heating and cooling business since 1971, bringing decades of expertise to every project.

Ace Home Heating & Air Conditioning provides comprehensive HVAC services including air conditioning and furnace repair, installation, and maintenance in Riverside, CA. They serve the Inland Empire, High & Low Desert communities, and surrounding areas. The company offers 24/7 residential air conditioning services and specializes in heating and furnace repair to keep homes comfortable year-round. Their technicians work with major HVAC brands and focus on delivering reliable solutions tailored to customer needs. With over ten years of experience, Ace Home Heating & Air Conditioning is equipped to handle heating and cooling issues at any time.

Rojas Air Conditioning provides HVAC tune-up services in Irvine, CA. The company offers maintenance for air conditioning systems, with technicians who have over 20 years of experience. Their team is thoroughly trained to handle various HVAC maintenance needs.

Trabuco is an HVAC contractor based in Long Beach, CA, offering custom heating and cooling repair and installation services. They provide 24/7 emergency repair for air conditioners and furnaces, working with both gas and electric systems. The company stocks certified heater and air conditioner parts to support maintenance and performance improvements. Trabuco emphasizes quality and value in their service approach and is known for their transparent process and local expertise.

AC Heating and Cooling Service Inc. is a family-owned HVAC company serving San Francisco, CA, and the Bay Area with over 45 years of experience. They provide a full range of heating, ventilation, and air conditioning services for residential, commercial, and industrial clients, including installation, repair, maintenance, and indoor air quality solutions. The company is known for integrating advanced IoT technology in HVAC systems to improve energy efficiency and system performance. They offer 24/7 emergency repair services without extra charges and back their work with a 12-month service guarantee and manufacturer warranties.

Comfort Air is a local HVAC company based in Santa Ana, CA, offering heating and air conditioning repair and installation services. They provide same-day service throughout Orange County and work with a wide range of well-known HVAC brands. Comfort Air focuses on delivering quick and affordable solutions for air conditioning, furnace, and heat pump systems.

Cool Breeze Heating and Air is an HVAC company serving Bakersfield, CA, and the surrounding areas including Jefferson City and Lake of the Ozarks. They provide a range of services including air conditioning and furnace repair, installation, and routine maintenance for both residential and commercial properties. The company also offers home automation system installations. Their technicians are licensed and insured, focusing on getting the job done right the first time.

DB Sales and Service is a boiler repair company and installation contractor based in Los Angeles, CA. They specialize in commercial and industrial boilers, burners, and pumps, offering a variety of high-efficiency boilers that meet California's Ultra Low NOx emission standards. The company is a factory-authorized service provider and manufacturers' representative for commercial-grade boilers and HVAC equipment in Southern California. Their team is available 24/7 for emergency repairs and installations, ensuring continuous support for their clients. DB Sales and Service also partners with top manufacturers to provide resource-efficient pumps and energy-efficient HVAC solutions.

Heating, Cooling & Appliance Technique Inc provides HVAC repair, installation, and maintenance services in San Jose, CA. They handle air conditioning, furnace, heat pump, and duct replacement for both residential and commercial clients. The company offers 24/7 emergency service and uses advanced equipment to ensure thorough repairs and clean work areas. With many years of experience serving the San Jose area, they focus on tailored HVAC solutions and preventive maintenance to improve system efficiency and longevity.