Psychrometrics
kW Psychrometric Functions will allow you to do psychrometric calculations in MS Excel. The software is based on ASHRAE correlations and is more than accurate enough for HVAC applications. It works with both English (IP) and Metric (SI) units.
Get kW Psychrometric Functions for FREE!
You can download the file here
You can calculate these properties in any Excel spreadsheet:
- Enthalpy (h)
- Dewpoint Temperature (dp)
- Relative Humidity (%)
- Humidity Ratio (W)
- Specific Volume (v)
- Wet Bulb Temperature (wb)
MS Excel Compatibility
kW Psychrometric Functions is a free MS Excel add-in that will allow you to do psychrometric calculations. It is compatible with MS Excel 2003/2007/2010.

You can also quickly and easily plot points on a psychrometric chart
The chart will correct automatically to any altitude that you select, up to 30,000 ft. or 10,000 meters. The functions are accurate between -60°F and 120°F or between -50°C and 50°C. The software can calculate Grains as well (IP functions only).

Metric Psychrometric Chart
Metric functions are now supported with the same easy function calls from Excel. Also, the software comes with a metric psychrometric chart where you can plot points or processes.
New easy-to-use menu selections
Help and psychrometric chart templates are now available from a PDF.
Easy installation - no more copying files
Installation is easy - just double click on the setup file and everything else is done for you. No more copying files to the right locations or finding obscure directories.
What's Included
- An MS Excel add-in that makes psychrometric functions available to you in any Excel spreadsheet.
- A spreadsheet template with a built-in psych chart. (Just add your data to make a plot)
- Examples
- A windows help file (searchable - but you probably won't need it)
The whole package installs and uninstalls automatically.
Download the file here

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— California Utility, Project Manager
