Building Energy Efficiency Software Tool – Climate Control News


Version 6.0 of the Hydronic Industry Alliance-Commercial (HIA-C) Building Efficiency System Tool (BEST), an interactive commercial building HVAC system efficiency comparison application, is now available.

The free download is at register.aspx

Revised software adds the ability to compare projected costs and energy consumption for all HVAC systems and hot water consumption in any building based on what is known before the money is spent for selection of HVAC and water heating systems, and almost all inputs can be adjusted. once the design process has begun.

BEST 6.0 also includes the following advancements:

  • Ability to model multiple heating and cooling sources. This allows the modeling of all electrical systems using cascading heat pumps and backup sources.
  • Cascading systems can include:
    • Air-to-water (ATW) heat pumps with water-to-water (WTW) boosters and boiler backup sources.
    • Water-to-air (WTA) heat pumps with ATW heat pumps and boiler backup sources.
    • WTW and WTA heat pumps with hybrid geothermal sources.
    • Air-to-air (ATA) heat pumps with furnace, boiler or resistance back-up sources.
    • Multiple types of configurable heating or cooling sources for load sharing.
  • Air-source heat pumps with the ability to model user-definable ambient temperatures for switching on backup sources or shutting down the heat pump.

“BEST is an early modeling tool for sorting out options for HVAC systems when very little information is known about the building,” said Greg Cunniff, PE, director of applied solutions for Williams Comfort Products. “With the trend towards all-electric solutions, including cascaded heat pump systems, BEST is able to quickly and easily compare these innovative ideas. Legacy modeling software currently struggles to compare these new ideas.”

When introduced in 2016, BEST solved a long-standing industry problem of being able to accurately compare different styles of HVAC systems, all of which are tested to different standards, with different efficiency ratings (EER, IEER, SEER, COP, HSPF), as applied in a real building.

To learn more about the Hydronic Industry Alliance-Commercial and the Radiant Professionals Alliance, or to join this important effort to promote efficiency, visit and


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