Given that the McQuay Duct Sizer is legacy software (last updated circa early 2010s), many Mac engineers have moved to modern, cloud-based or cross-platform duct sizers. Consider these instead:
Daikin’s modern replacement. Works in Safari or Chrome. Includes duct sizing, pipe sizing, and equipment selection. Requires a free account. The interface is modern but slower than the classic .exe. mcquay duct sizer for mac
If you're looking for a more manual or "paper" solution, you can refer to HVAC engineering textbooks or resources that provide duct sizing charts and methodologies for manual calculations. ASHRAE and other industry organizations publish guides and standards that can be used for manual duct sizing. Given that the McQuay Duct Sizer is legacy
Several engineers have built HTML5/JavaScript duct sizers. Search for “Web-based equal friction duct sizer.” Examples: Includes duct sizing, pipe sizing, and equipment selection
If you are an HVAC engineer, contractor, or design-build professional who uses a Mac, you’ve likely encountered a frustrating roadblock: The McQuay Duct Sizer (now part of Daikin Applied) does not have a native macOS version.
For over two decades, the McQuay (Daikin) Duct Sizer has been a staple tool in the Windows ecosystem. It is a free, lightweight, and remarkably accurate program for sizing ductwork based on friction loss, velocity, and flow rate. Yet, for the growing legion of HVAC professionals who prefer Apple hardware, running this tool requires ingenuity.
This article explores the history of the McQuay Duct Sizer, why it never came to Mac, how you can run it today, and what native macOS alternatives exist.