GRAINGER SAN MARCOS Branch #721 1321 Linda Vista Dr. SAN MARCOS CA 92078-3804 serves more than 3 million customers worldwide. Grainger carries over 1.5 million industrial products serving contractors in the fields of HVAC plumbing electrical food service and hospitality and many more. Aeas Served: Grainger operates hundreds of supply houses throughout the United States and Canada. What Brands Does Grainger Sell? Grainger carries name brands from A.O. Smith Aaon Alco Amana Amprobe Aprilaire Asco Atco Bacharach Bally Beckett Bristol Carrier Century Comfort-Aire Copeland Cozy Daikin Danfoss Diversitech Dwyer Emerson Fasco Field Controls Friedrich GE Goodman Grundfos Hoffman Honeywell Husqvarna ICM ICOR JB Johnson Controls Kolpak Lennox Liebert Manitowok Mars Modine Nu-Calgon Panasonic Parker Ranco Reznor Ridgid Robertshaw Scotsman Siemens Supco Taco Testo Tjerland Trane True Watts Whirlpool York Yellow Jacket and many other HVAC supplies.