HDPsyChart/Akton V9Licensing Options

The brand new HDPsyChart Version 9 and Akton Version 9 Windows desktop applications were released in the spring of 2025. These versions includes over 40 updates and bug fixes to Version 7, the most popular psychrometric chart software in the world. The following is information on our licensing structure:

Subscription License

The standard way that HDPsyChart/Akton have been licensed in the past is by allowing a licensee to pay a one-time fee to use the software in perpetuity. This has worked for most users since the HDPsyChart/Akton softwares have not been updated in over a decade. Now that Hands Down Software is under new ownership, our strategy is to update the software yearly (at least) so we can provide you the greatest functionality and latest ASHRAE and related data.

The subscription service will work as follows:

  1. You pay a yearly fee of $199/license.
  2. You receive the following ongoing benefits:
    • Yearly (or more often) updates
    • Unlimited support via phone, email, and other means.
    • Yearly training sessions (mininum of 10 licenses)
    • Access to the online licensing portal for self-registration (mininum of 10 licenses)
    • Includes customizing the application with your logo (mininum of 10 licenses)
  3. Click here to order the subscription license.


Perpetual License

We understand that some users may prefer the traditional perpetual licensing option. Therefore, we are offering this option:

  1. You pay a one-time fee of $399/license for HDPsyChart V9 or $499/license for Akton V9.
  2. You can use the software in perpetuity (forever).
  3. This option does NOT include updates beyond minor bug fixes.
  4. To receive updates beyond minor bug fixes, you must subscribe to the subscription service listed above. If you do want to purchase a future update, you will need to pay the full license fee being charged at that time.
  5. Click here to order the perpetual license.


Deluxe Subscription License

This is a premium subscription service that includes all of the benefits listed in the Subscription License section above. It also includes the following:

  1. You pay a yearly fee of $899/license.
  2. You receive the following ongoing benefits:
    • 20 additional engineering software tools included such as heat wheel, heat exchange, and thermal comfort calculators.
    • More frequent updates including the latest ASHRAE and TMY3 weather data and data center data from ASHRAE Guideline 9.9
    • Individual training on the HDPsyChart V9 software
    • Premium support within the hour including support via phone, email, and other means.
    • and more ...
  3. Click here to order the deluxe subscription license.

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