O.C. McDonald: San Jose’s Trusted HVAC & Plumbing Partner Since 1906

For over a century, O.C. McDonald has been the go-to mechanical contractor for San Jose, CA homes and businesses. This family-owned company brings old-fashioned reliability and modern technology to every job, from fixing a leaky faucet to installing complex HVAC systems for tech campuses. Open 24/7 for emergencies, their team handles both residential calls and large commercial projects across the Bay Area.

Business Overview

O.C. McDonald operates around the clock, providing emergency service whenever San Jose residents need help. Their skilled employees work on everything from apartment plumbing to industrial piping. While known for major commercial installations, they also serve homeowners in Fruitdale and nearby neighborhoods with the same care and precision.

Key Services

O.C. McDonald offers a full range of HVAC and plumbing solutions. Common services include:

• HVAC Services: Installation, repair, and maintenance of heating and cooling systems to handle Silicon Valley’s warm summers and mild winters.
• Plumbing Repairs: Fixing drains, toilets, showers, faucets, and garbage disposals.
• Water Heaters: Installation and repair for gas and electric units.
• Gas Line Work: Safe installation and repair for appliances.
• Sewer and Plumbing Systems: Full installation, replacement, and inspection services.

Whether it’s a routine maintenance check or a new HVAC system for a older San Jose home, they have the expertise.

Areas Served

O.C. McDonald primarily serves Fruitdale, CA, and the greater San Jose area. Their long history means they understand local building styles, from historic bungalows to modern tech office buildings. They know the common issues Bay Area properties face, like hard water effects on plumbing or ventilation needs in valley heat.

Company History

Founded in 1906 by Oren Charles McDonald, O.C. McDonald Company is the oldest plumbing and HVAC contractor in Silicon Valley. Starting as a small shop, it grew alongside San Jose, adapting to new technologies while keeping its commitment to quality. Today, it remains a leader in mechanical contracting, known for tackling some of the region’s most complex installations.

Leadership

The company is now owned and run by Jim McDonald, the founder’s great-grandson. Jim continues the family tradition of hands-on leadership, ensuring projects meet high standards. Under his direction, O.C. McDonald stays involved in the local community, supporting Bay Area growth with reliable contracting services.

Specialties & Highlights

What makes O.C. McDonald stand out in San Jose, CA:

• LEED and Tech Expertise: They specialize in LEED-certified projects, data centers, clean rooms, and building automation—key for Silicon Valley businesses.
• In-House Fabrication: Their own sheet metal and piping shops allow for custom solutions and faster timelines.
• Advanced Technology: Use of 3D modeling and direct digital controls for precise, efficient installations.
• Broad Industry Experience: From healthcare and hospitality to heavy industrial piping, they’ve done it all.
• Century-Long Reputation: Built on consistency, quality workmanship, and staying on budget.

Why Locals Choose O.C. McDonald

San Jose residents and businesses pick O.C. McDonald for simple reasons: they deliver what they promise. With a 100+ year track record, they combine proven methods with new tools to get jobs done right. Their local knowledge, 24/7 availability, and focus on customer service make them a dependable partner for any HVAC or plumbing need in the Bay Area.