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Claim This BusinessO.C. McDonald Co., Inc. has operated as a San Jose mechanical contractor since 1906, making it one of the oldest continuously held family businesses in the Silicon Valley region. The company holds a 4.2-star rating drawn from 21 homeowner reviews, reflecting decades of consistent service to the local community. Specializing in both residential and commercial projects, O.C. McDonald provides installation, repair, and maintenance across HVAC systems, plumbing, and building automation, serving San Jose, Mountain View, Sunnyvale, and surrounding Peninsula communities from its headquarters on Hostetter Road.
What distinguishes O.C. McDonald is its single-source project management approach, where one contract oversees design, installation, and ongoing service rather than coordinating multiple subcontractors. The company maintains 24-hour emergency availability with a live operator, ensuring a technician responds when systems fail during off-hours, a critical feature for Bay Area homes where summer heat waves and winter flooding create urgent climate-control emergencies. Their commercial division handles complex process piping and direct digital control systems typically found in research facilities and office buildings, while their residential team focuses on straightforward heating and cooling replacements without over-engineering solutions.
Four of four published reviewers awarded 5-star ratings, with each customer specifically naming technicians who solved problems previous contractors missed. Linda Grevera and Dominic Pajak both highlighted water heater repairs, while Sheri Ricci emphasized the company's 20-plus-year relationship with her family during emergencies. No negative reviews exist in the available sample.
| Sunday | Closed |
| Monday | 7 AM–4 PM |
| Tuesday | 7 AM–4 PM |
| Wednesday | 7 AM–4 PM |
| ThursdayToday | 7 AM–4 PM |
| Friday | 7 AM–4 PM |
| Saturday | Closed |
Complete heating and cooling system installation for single-family homes, from standard efficiency units to custom configurations.
Air conditioning diagnostic services, refrigerant recharge, component repair, and seasonal tune-ups to restore cooling performance.
Furnace repair, heat pump maintenance, and heating element replacement for Bay Area homes during winter months.
Traditional tank water heater repair, sediment removal, and new unit installation including code-compliant flue upgrades.
Full project management for commercial new construction including design coordination, HVAC installation, and building systems integration.
Commercial plumbing infrastructure and specialized process piping for research, medical, and manufacturing facilities.
Direct digital control and building automation system installation allowing remote monitoring of commercial building systems.
Live operator availability for after-hours emergency dispatch across the greater San Jose service area.