• ★ Mean HVAC BS Tools
• ★ 2026-02-10
• ★ Questions & Answers

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About Mean HVAC BS Tools

BS Tools is a toolkit of calculators designed for HVAC and other Building Science (BS) applications, as an alternative to more tedious, manual methods.


Utilities


Single Point Psychrometrics:
This calculator provides psychrometric properties of air at a glance. It's awesome for changing humidity units.

Mixed Air Psychrometrics:
This calculator provides instant psychrometric properties of the resulting air of 2 mixed air streams, e.g. ventilation air mixed with return air.

Duct Calculator:
In a word, it's a classic 'ductulator'. This tool accepts any 2 choice inputs among CFM (Air Flow Volume), Duct Diameter, Friction Rate (Head Loss), and Air Velocity. This utility will then provide the other 2 parameters for you. You can enter either a round diameter, or 2 rectangular dimensions. This tool will optionally display both round and rectangular dimensions, if given a 1st rectangular dimension, or by inputting a rectangular duct size.

Smallest Space Calculator:
This calculator can be used to gauge how much excess air is acceptable in a heating or cooling system.

Bypass Calculator:
Paired with the Smallest Space Calculator, this can tell you how much air you can bypass, which uses various parameters dependent on whether you are cooling or heating. This contains a couple notable features: The Cooling Bypass CFM Limit section gives both conservative and aggressive values, based on the expected settled air temperature. Also, the Heating Bypass CFM Limit section features a mini calculator to support you adjust your rated BTUH for elevation.

IR Wall Insulation:
This calculator can support you estimate the R-Value of a wall, with Infrared (IR) exterior and interior surface, and interior ambient temperatures. The key feature of this tool is providing a common wall material that best matches your readings with a general degree of confidence in that match. We also contain hints on measuring for best results.

Parallel R-Value:
This calculator provides an overall R-Value (and U-Value) for a wood frame building assembly* (typically a wall), given the R-Values of various materials and their spaces or proportions show in the assembly. *Not for use with metal framing.

Note:
The above calculators use IP (inch / pound) units.

Unit Converter:
Converts units.

New Features:

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