For over 35 years, Arzel Zoning Technology, Inc. has been an innovator of HVAC zone control systems designed for new construction and retro-fit, residential and light commercial applications. Arzel provides zoning solutions made simple and reliable. Designed specifically for trouble-free installation, the company's products are perfect for retrofit and new construction applications in either residential or commercial buildings.

Smart Service is a US-based provider of HVAC software solutions for a wide range of applications. Smart Service adds scheduling, dispatching, and more to QuickBooks, helping companies streamline their operations and eliminate waste.