O.C. McDonald Plumbing

Founded in 1906 by Oren Charles McDonald, O.C. McDonald is currently owned and run by O.C’s great grandson, Jim McDonald. A rare family-owned business in San Jose that is still in operation, O.C McDonald is famous for having installed the first air conditioning system in the Valley. How can you not smile at the homonym on the sign, ” Oh See! O.C. McDonald” …


Here’s a brief history of the business courtesy the Silicon Valley Historical Association.

1150 W. San Carlos Street


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