R.F. MacDonald Co. is a boiler repair and installation contractor serving Oakland, CA. Founded in 1956, the company provides commercial and industrial boiler services, including sales and maintenance of boilers, pumps, composites, and related accessories. With a team of sales engineers, mechanical engineers, parts specialists, and field service personnel, they offer comprehensive support for boiler equipment. Their focus on proactive field service distinguishes them in the industry.

Airteks.com Inc is an HVAC installation contractor based in Fremont, CA. They specialize in installing air conditioning units, furnaces, and heat pumps. The company is known for handling complete unit replacements with professionalism and care. Their team focuses on delivering quality installation services to meet the heating and cooling needs of local residents.

Bay City Boiler is a boiler repair and HVAC tune-up company serving San Jose, CA, and the broader Bay Area and Central Valley. Established in 1976, they specialize in boiler maintenance and repair with a large service team and 24/7 emergency support. Their services include fast emergency response and a proactive maintenance program designed to reduce downtime and prevent failures. Bay City Boiler also offers boiler room equipment sales and partners with testing labs to ensure system performance.

Affordable Heating & Air Conditioning is an HVAC company serving Oakland, CA, and the Bay Area. They provide residential and commercial heating and air conditioning services including repair, installation, and tune-ups for all makes and models. With over 20 years of experience, their factory-trained technicians handle heating, cooling, refrigeration, and ventilation systems. The company emphasizes long-term maintenance and system upgrades to ensure reliable operation.

A Plus Heating and Air Conditioning provides heating, air conditioning, and HVAC installation services in Fremont, CA. The company offers a range of indoor comfort products from leading manufacturers such as Lennox, Trane, Carrier, and Goodman. They focus on delivering advanced HVAC solutions and maintain strong relationships with industry manufacturers to ensure up-to-date technology is available to their customers. A Plus Heating and Air Conditioning operates with locations across California, including Northern and Southern regions.

Swift Heating & Air is an HVAC company serving Fremont, CA, offering a wide range of heating and cooling services. Their expertise includes air conditioning repair, installation, and maintenance, as well as furnace and heat pump repair and replacement. They also provide specialized services such as ductless and mini split AC system installation, indoor air quality solutions like air purifiers and dehumidifiers, and commercial HVAC support. The company handles air duct sealing and sheet metal forming as part of their comprehensive HVAC offerings.

Black Diamond Heating & Air is an HVAC company serving Oakland, CA, and surrounding areas including Antioch, Brentwood, Byron, Discovery Bay, Oakley, and Pittsburg. They offer air conditioning and furnace repair, installation, and maintenance services for residential, commercial, and industrial clients. Their commercial HVAC capabilities include refrigeration installation and repair, with experience in manufacturing facilities, office buildings, supermarkets, and more. Established in 1984, Black Diamond Heating & Air has decades of experience providing heating and cooling solutions in Contra Costa County.

ACS Air Conditioning Systems is a family-owned HVAC company serving Oakland, CA, and the East Bay Area. Established in 1969, they specialize in HVAC repair, maintenance, and installation for heating and air conditioning systems. As a factory-authorized Carrier dealer, ACS offers expert advice on Carrier products and handles installations with a focus on quality and efficiency. Their services include air conditioning, furnace, and heat pump repair and installation, along with indoor air quality solutions.

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.