Business Details
50+ Years
experience
Emergency
services
Trusted HVAC and Plumbing Services in San Jose
O.C. McDonald has been a trusted leader in mechanical contracting since 1906, combining old-fashioned values with innovative technology to deliver exceptional HVAC, plumbing, and process piping solutions. Our century-long legacy in San Jose, California, is built on expertise in design, installation, and service for commercial and residential clients. We prioritize quality craftsmanship, on-time delivery, and budget adherence, supported by in-house fabrication facilities and a team of certified professionals.Our commitment to safety, LEED certification, and 24/7 emergency response ensures reliable service for complex projects across industries like healthcare, technology, and education. With state-of-the-art 3D modeling tools and a focus on energy efficiency, we provide tailored solutions that meet evolving client needs while maintaining our reputation as the Bay Areas most respected mechanical contractor.
Services
HVAC Installation
Plumbing Services
Process Piping
Building Automation
Emergency Repairs
Sheet Metal Fabrication
LEED Certification
Retro-Commissioning
Design/Build Projects
Preventive Maintenance
Details
- Year established: 1906
Highlights and features
- We offer over 100 years of experience in mechanical contracting.
- Our 24/7 emergency service responds within two hours for critical issues.
- We maintain ASME Pressure Piping code compliance for safety and quality.
- Our in-house fabrication facilities ensure precision and cost efficiency.
- We specialize in LEED-certified sustainable building solutions.
Associations and certifications
- ASME Pressure Piping (PP) code compliant
Services
HVAC Installation
O.C. McDonald provides full-service HVAC installation for residential and commercial properties. Our team uses advanced 3D modeling and energy-efficient systems to ensure optimal performance. We specialize in complex projects, including LEED-certified buildings and high-tech clean rooms.
Plumbing Services
We design and install medical gas, natural gas, and water systems for commercial and residential clients. Our licensed plumbers handle everything from simple repairs to large-scale projects like hospital plumbing systems. Safety and code compliance are our top priorities.
Process Piping
Our experts fabricate and install high-purity piping systems for semiconductor plants, food processing facilities, and power generation sites. We follow ASME Pressure Piping standards to ensure durability and safety in demanding environments.
Building Automation
We implement Direct Digital Control (DDC) systems to optimize energy efficiency in HVAC operations. Our solutions integrate with platforms like Johnson Controls and Honeywell to provide real-time monitoring and system adjustments for commercial buildings.
Emergency Repairs
Our live operator dispatches technicians for urgent HVAC or plumbing issues 24/7. We guarantee a two-hour response time for contract customers, minimizing downtime with rapid diagnostics and repairs using pre-stocked parts.
People
Oren Charles McDonald
Founder
Founded O.C. McDonald in 1906 and installed San Jose's first air conditioning system. His legacy of quality craftsmanship and customer service remains central to the company's values today.
Questions
What services does O.C. McDonald offer?
We provide HVAC installation, plumbing, process piping, building automation, emergency repairs, and LEED-certified solutions for residential and commercial clients.
Do you offer 24/7 emergency service?
Yes, our live operator dispatches technicians 24/7 with a two-hour response time for urgent HVAC or plumbing issues.
Are financing options available?
Yes, we offer financing for residential HVAC and plumbing projects to help manage costs.
What areas do you serve?
We serve Silicon Valley and the Bay Area, including San Jose, Monterey, and Walnut Creek.
Is O.C. McDonald LEED-certified?
Yes, we partner with LEED project teams to achieve certification through energy-efficient HVAC and sustainable construction practices.
How can I request a free estimate?
Contact us via phone or our website to schedule a consultation and receive a detailed estimate for your project.
