Business Details
50+ Years
experience
Emergency
services
Trusted HVAC and Plumbing Services in San Jose Since 1906
Founded in 1906, O.C. McDonald has established itself as a leader in mechanical contracting, delivering HVAC, plumbing, and process piping solutions across the Silicon Valley and Bay Area. Our legacy combines old-fashioned values with cutting-edge technology, ensuring clients receive consistent quality, exceptional service, and projects completed on time and within budget. With over a century of experience, we installed San Joses first air conditioning system and continue to innovate through advanced 3D modeling, BIM coordination, and LEED-certified practices.Our in-house fabrication facilities and 24-hour emergency service team guarantee rapid response times and unmatched reliability. We specialize in commercial and residential projects, from high-tech clean rooms to custom home installations, serving industries ranging from healthcare to data centers. Our commitment to safety, ASME compliance, and SMACNA-established commissioning standards underscores our dedication to excellence. As a family-owned business, we prioritize transparency, offering free estimates and financing options to meet diverse client needs.
Services
HVAC Installation
Plumbing Services
Process Piping
Building Automation
Sheet Metal Fabrication
LEED Certification
Emergency Repairs
Preventive Maintenance
Design/Build Projects
Commercial Retrofits
Details
- Year established: 1906
Highlights and features
- We offer over 100 years of experience in mechanical contracting.
- Our 24-hour emergency service ensures rapid response to critical issues.
- We utilize state-of-the-art 3D modeling software for precise project coordination.
- Our in-house fabrication facilities ensure quality control and cost efficiency.
- We have expertise in LEED-certified projects for sustainable building solutions.
Associations and certifications
- ASME
- SMACNA
Services
HVAC Installation
We design and install advanced HVAC systems for commercial and residential properties, using energy-efficient technologies and Direct Digital Controls. Our solutions ensure optimal climate management while reducing operational costs. With decades of experience, we deliver reliable installations tailored to client-specific needs.
Plumbing Services
Our licensed plumbers handle complex systems including medical gas, natural gas, and sanitary waste. We provide installation, repair, and maintenance services for commercial and residential clients. Our expertise ensures code compliance and long-term system reliability across Silicon Valley.
Process Piping
We specialize in high-purity and industrial process piping for semiconductor, food processing, and power facilities. Our team designs, fabricates, and installs systems meeting ASME standards. Safety and precision guide every project from initial design to final commissioning.
Building Automation
Our Direct Digital Control (DDC) systems optimize building efficiency through automated HVAC management. We integrate technologies from Johnson Controls and Honeywell to enhance energy savings. These solutions provide real-time monitoring and adaptive climate control for commercial clients.
Sheet Metal Fabrication
We fabricate and install custom duct systems using galvanized and stainless steel materials. Our SMACNA-certified processes ensure precision for projects ranging from educational facilities to semiconductor plants. In-house fabrication guarantees quality and timely delivery for complex commercial needs.
Questions
What services does O.C. McDonald offer?
We provide HVAC, plumbing, process piping, building automation, and sheet metal fabrication services for commercial and residential clients.
Do you offer emergency services?
Yes, we provide 24/7 emergency response with a two-hour guarantee for contract customers in Northern California.
Are financing options available?
Yes, we offer financing for residential HVAC and plumbing projects to qualified customers.
What areas do you serve?
We serve Silicon Valley, the Bay Area, and Northern California, including Monterey to Walnut Creek.
Can you handle LEED-certified projects?
Yes, we partner with LEED project teams to implement sustainable practices and achieve certification goals for new and existing buildings.
How do you ensure project quality?
We use ASME-compliant processes, SMACNA standards, and in-house fabrication to maintain quality from design to completion.
