CaptiveAire Toolbox
HVAC ENGINEERING TOOLBOX
About
This app provides over 40 HVAC and building-systems engineering calculators. It's designed for field use, offering standard industry formulas for cooling, heating, ventilation, electrical sizing, and more. Access detailed formula definitions and reference data.
What's New in CaptiveAire Toolbox
1.4.1
August 21, 2026
Bug fixes and improvements
FAQ
What types of cooling calculations does CaptiveAire Toolbox offer?
CaptiveAire Toolbox offers several cooling calculations, including Total Cooling Load (enthalpy-based with humidity), Sensible Cooling Load, Latent Cooling Load, SEER, and Cost of Cooling. It also provides Tons to BTU/hr conversions and specific modes like DX/MPU Cooling.
Can CaptiveAire Toolbox help with heating system calculations?
Yes, CaptiveAire Toolbox includes heating calculations for BTU output of direct and indirect fired heaters, input/output BTU/hr for IBT systems, and temperature rise from BTU and CFM. It also calculates Heat Pump capacity with airflow and outdoor temperature adjustments.
Does CaptiveAire Toolbox include electrical sizing tools?
Yes, CaptiveAire Toolbox features electrical sizing tools based on NEC Table, including calculations for MCA and MOCP for motor circuits, and amperage from horsepower. This helps ensure compliance with electrical codes.
What reference data is available in CaptiveAire Toolbox?
The app provides ASHRAE Weather Station data with an autocomplete address search, returning heating and cooling design temperatures, solar irradiance, and wind speeds. It also includes an interactive Psychrometric Chart with property calculations.
How does CaptiveAire Toolbox explain its formulas?
Each calculator in CaptiveAire Toolbox includes accessible formula and variable definitions from the title bar. Tapping the info icon reveals the exact equation used to derive the result, promoting transparency.
Is CaptiveAire Toolbox available on Android devices?
CaptiveAire Toolbox is currently supported on iPhone and iPad devices. Information regarding Android availability is not provided in the current data.
How often is CaptiveAire Toolbox updated?
The latest version of CaptiveAire Toolbox is 1.4.1, which was last updated on August 21, 2026. The release date was May 7, 2026, suggesting a relatively frequent update cycle.
Does CaptiveAire Toolbox have ads?
No, CaptiveAire Toolbox is ad-free. The description explicitly states 'No tracking, no ads, no account required,' ensuring an uninterrupted user experience.