Interactive, graphical psychometric chart app. Allows you to create and manipulate charts and state points with the touch of your finger(s).

Add new state points by double tapping anywhere on the chart. Hold and drag existing state points to move them on the graph, with properties values updating live to aid you in setting them to the right value.

Works in both SI and IP units.

Allows you to create and save multiple charts.

Processes that can be modeled include:

• An individual state point.
• Air mixing.
• Sensible heating.
• Sensible cooling.
• Cooling coils.
• Other processes by connecting state points.

Properties and energy change for connected points are calculated and displayed live.

Share your charts by exporting a PDF file or sending to an AirPrint device.

Works on both the iPhone and iPad, but best used on the larger screen of the iPad.

This application (App) is provided for use by qualified HVAC engineers and designers in the design of air handling systems and is not a substitute for appropriate design services. When in doubt, contact a design


We would very much like your feedback!
Suggestions, complements, complaints, bug reports etc.:

If you like this app, please do not forget to rate it in the App Store!

What’s New

Version 1.4

- iOS 13 Contextual Menus
- Can now reorder the charts
- Bug fixes and other minor improvements

Ratings and Reviews

4.4 out of 5
15 Ratings

15 Ratings

Mkenntrn ,


Doesn’t show grains of moisture

Developer Response ,

The app can indeed show grains per pound of dry air for humidity ratio. Go into settings and change the units for Humidity Ratio to grains/lb, rather than the default lb/lb. Grains of moisture per pound of dry air will now display.

Hope this helps. Feel free to contact us at if you have any additional questions.

sdmarkf ,

More capability

Really cool but why not have tonnage in latent and sensible loads

Maddmonster2003 ,

It's an app.......

It's a psychrometric app. You input two conditions for a point, and it will locate it on the psychrometric chart.... it will give properties at that given point.... but that's about it. They show a screen shot, where the app appears to show the process line for an air conditioning cycle. That image is completely fake! It will not give you a process line. You have to know the conditions of the return air, the outside air, the mixed air, and the leaving coil temperature. There's no input for the sensible heat ratio, there's nothing to this app to justify the price. This app does nothing but plot points on a chart. I should have spent my money on the lottery....

Developer Response ,

Sorry to hear that you are unhappy with the app. The App will show process lines (cooling coil, air mixing, sensible heating/cooling). To change the process type, create at least two state points. Then, either tap once to highlight the end state point, and select the "Edit" icon at the bottom of the screen or double tap the state point to bring up the Edit State Point dialog. Change the "Type" of the process. Choices are Point, Cooling Coil, Connect State Point, Air Mixing, Sensible Heating/Cooling. It will then display the process lines based on the data you input. Sorry if this is not easily discoverable!

If you have additional input, or need assistance with the app, we can be contacted at and we will be glad to try to help.


Pheinex, LLC
22 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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