UNITED SUPPLY 1001 LOWER LANDING RD. BLACKWOOD NJ. 8012 has been satisfying the needs of plumbing and HVAC contractors since 1912. United Supply Company is wholesale supply house of plumbing and HVAC parts equipment and supplies. AREAS SERVED: United Supply Company operates 10 HVAC wholesale distribution warehouses and four plumbing showcase showrooms throughout New Jersey. BRANDS CARRIED: United Supply Company offers name brand HVAC supplies from Ruud Fujitsu Honeywell Hart & Cooley Airtec ADP A.O. Smith Little Giant Hartell as well as many others.