Tools of the Trade

Tools of the Trade

Each month, Contracting Business picks a leading contractor and takes a look at the products, tools, and services that he or she has chosen to help make their company successful.

Service Unlimited, Inc. New Castle, DE
Service Unlimited, Inc. (SUI) is the 2012 Contracting Commercial HVAC Contractor of the Year. SUI was incorporated in 1962 by Richard Wolf and Eugene Gaumer. President Carl Wolf (above) has been leading SUI since 1986. SUI’s specialties include HVAC mechanical system Design/Build, system testing and inspection, maintenance, service, and HVAC/building management control systems.

Service Unlimited’s business relationships are based on fairness in pricing, a commitment to excellence, and an understanding of what’s required to run a successful commercial HVAC firm in a very competitive environment. Much of SUI’s success has been based on positive referrals from satisfied customers who testify to SUI’s customer service, technical expertise, and dedicated employees. You can find the SUI story online at


  • Type of trucks/vans: Four Chevy pickup trucks, 30 Chevy vans, one Chevy 12-ft. utility van, one Ford 18-ft. utility van, and one Ford Transit.
  • Tools provided: Power tools, Sawzall, combustion analyzers.
  • Preferred tools and test instruments technicians carry: Fieldpiece, Fluke, Testo, UEI CPA.
  • Inventory on trucks/vans: Includes contactors and belts.
  • Preferred field communications method: Verizon wireless.
  • Preferred ladders: Little Giant, Louisville.


  • Preferred business management software: Maxwell.
  • Preferred sales management software: Maxwell.
  • Preferred load calculation software: Carrier E-20.
  • Preferred fleet tracking software: At Roads.
  • Preferred computer/printer equipment: Xerox.
  • Preferred photocopier equipment: Kyocera.
  • Fax machines: Kyocera.
  • Business connection to the Internet via: Paetec (Windstream).
  • Preferred uniform supplier: Cintas.
  • Credit Cards Accepted: Visa, MasterCard, American Express.


  • Preferred heating equipment brands: Carrier, Trane, York, Multistack, WaterFurnace, ClimateMaster, Weil McClain, Lochinvar, BAC/Evapco/Marley cooling towers.
  • Preferred cooling equipment brands: Carrier, Trane, York, Multistack, WaterFurnace, ClimateMaster.
  • Preferred accessory brands: Controls—Honeywell DDC, Tridium DDC, DuctSox fabric air ducting, Uponor radiant heating and snow melt.
  • Preferred Indoor Air Quality equipment: Carrier, Munters.
  • Preferred zoning equipment: Honeywell, Carrier
  • Preferred distributors: Pierce Phelps, Lyon Conklin & Co., United Refrigeration.
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