# ASHRAE Psychrometric Chart

> Interactive psychrometric chart tool for iPad with IP and SI units. (iPhone/iPad app by ASHRAE, Inc..)

- Source: https://appshunter.io/ios/app/ashrae-psychrometric-chart/id584295008 (this page in markdown: same URL + `.md`)
- Developer: [ASHRAE, Inc.](https://appshunter.io/developer/375374912)
- Category: Productivity, Business
- Price: $19.99
- Age rating: 4+
- Requires: iOS 13.0 · 2 MB
- Languages: American English
- Released: 2012-12-13
- Data updated: 2026-06-03
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ashrae-psychrometric-chart/id584295008/reviews.md

## What is ASHRAE Psychrometric Chart?

The HVAC Psychrometric Chart app is the first truly interactive graphical psychrometric chart for the iPad, and it includes both IP and SI units. It is now optimized for iOS 16.

Using your finger, you can easily plot HVAC and other psychrometric processes on the iPad screen while you are out in the field, save the graphs, and then email the graph and results to yourself or clients. The HVAC Psych Chart app includes the following features and functionality:

1. Displays a fully customizable psychrometric chart in both landscape and portrait modes.

2. Allows you to customize the graph in many different ways including specifying the psychrometric chart line colors, chart background color, hide/display status of chart lines, point colors, process line colors, units of graph values, and the min/max limits of the chart.

3. Using your finger, you can plot as many points as you want on the screen. As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update . In addition, you can double-tap a point to display the point properties and then edit them.

4. Create psychrometric processes by plotting points then connecting them with process lines. Also, create custom labels anywhere on the chart.

5. After you have completed creating the chart, you can email a list of all the points and their properties along with a PDF of the chart, itself.

6. Create an unlimited number of psychrometric chart projects. Also, you can create templates that you can reuse over and over again.

7. Zoom in or out of the chart by "pinching" the iPad screen so as to view items in more detail.

8. Display sensible heat ratio (SHR) line

9. Display psych process line as curved along 100% RH line.

## Key features

- Interactive psychrometric chart plotting
- Customizable chart appearance
- Dynamic property updates
- Create and edit points and labels
- Email charts and data
- Unlimited projects and templates
- Zoom and pinch functionality

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/ashrae-psychrometric-chart/id584295008/reviews.md

### 3/5 — SI chart

*2023-09-01*

SI chart is still showing (F) note - a big blunder. Software should interface with full numerical (integer) DB / WB numbers, currently it is showing with decimals. These should be fixed.

### 1/5 — Difficult to use

*2021-06-03, version 3.1*

This app is so difficult to use, you literally need to locate your conditions manually on the chart itself, and doesn’t have the option to type your air conditions,,, and takes time to get it right, is there an option to refund ?

### 2/5 — Not ready for serious use

*2020-08-27*

This app has the beginnings of a good app. But as is, it is limited in usefulness, and ASHRAE should not be selling this essentially beta version as a serious tool. Specifically the shortcomings are:

1. Needs an undo button.
2. SHR < 10% displays as a vertical line. 
3. Needs enthalpy-humidity ratio button like SHR button.
4. Should be able to connect multiple lines to one point to show the correct process direction. For example, mixing point.
5. Need to add the ability to back up files.
6. Should add the ability to lock points so that they are not accidentally moved.
7. Would be nice to be able to delete lines by selecting them rather than going to the point menu to delete it. 
8. When editing a point, there are times when the changes are not accepted. 

If these changes are implemented, this could be a very useful app. However, as is, I wouldn't recommend purchasing it, and ASHRAE should make clear its limitations to people who are considering buying it. However, it appears that Carmel Software Corporation, who developed the app, is no longer updating it, and they don't respond to customer requests.

### 2/5 — Good app but needs work

*2020-06-19*

Needs undo feature. Does not work well with Apple Pencil; selecting a state point causes the point to move; must use finger to select points.  Connecting points with a process line will not carry forward the airflow rate; must be entered by hand for each point. Mixed air points are static individual points that are not tied to the air streams that created the mixed air point, such that if the conditions change then the mixed air point must be recreated. Occasionally, when pinching to zoom one of the state points will move even though my fingers were not near the point; something similar to this happens a couple of times on the training video from Carmel. The point properties form is not visible after zooming, appears to be off screen. 

Wish List:  
Create state points based on process loads. 

Bottom Line: The app feels like a beta version for a psychometric chart program that had a very limited budget.  In 2020 I expect software that is a bit more polished and more user friendly. And as one other comment stated, I would expect a little more from ASHRAE.

### 3/5 — OK

*2015-04-27*

Does not print legend assigned colors with email.

### 2/5 — needs work

*2014-08-25*

has potential, but is buggy and has stability issues.  Also, needs a screen where points can be directly entered by typing, and I dont see any way to easily compute attributes of process lines between points.

### 4/5 — Show Calculations

*2014-08-25*

Please allow email output to show complete calculations uses for state points.

### 4/5 — Good app  can you add Celsius reading too?

*2014-07-09, version 1.3*

Good app would love to have a in Celsius also

### 2/5 — Avoid if you use SI

*2013-05-06*

This app has potential.......but it's way too expensive for what is currently under-developed and buggy. For SI users you cannot re-scale the wet bulb scale to be useful (it is stuck on a directly converted oF scale which is limiting, the wet bulb main scale lines are eg 21.3oC for example rather than a round number). There is no undo button which is very frustrating as it's far to easy to accidentally move a carefully set up and placed process point.
The app regularly chucks you out of the function you are trying to carry out and puts you back into the main psych chart part. Very frustrating and a sign of lack of testing.

### 3/5 — HVAC Designer

*2013-02-08*

I expect more from an app with a ASHRAE label.
Loaded this app on my iPad 4G and cannot get a landscape display.

## Frequently asked questions about ASHRAE Psychrometric Chart

### What is ASHRAE Psychrometric Chart?

ASHRAE Psychrometric Chart is an interactive graphical tool for iPads that allows users to plot and customize psychrometric charts. It supports both IP and SI units for HVAC and other psychrometric processes.

### What devices is ASHRAE Psychrometric Chart compatible with?

ASHRAE Psychrometric Chart is currently optimized for and supported on iPads, running on iOS 16 and later.

### How much does ASHRAE Psychrometric Chart cost?

ASHRAE Psychrometric Chart is a paid application, with a price of $19.99. There are no in-app purchases or subscriptions required after the initial purchase.

### Can I save and share my charts?

Yes, you can save your created psychrometric charts and projects. The app also allows you to email a PDF of the chart along with a list of all points and their properties to yourself or clients.

### Does ASHRAE Psychrometric Chart have ads?

No, ASHRAE Psychrometric Chart is ad-free. Users can enjoy an uninterrupted experience while creating and analyzing psychrometric charts.

### How often is ASHRAE Psychrometric Chart updated?

The app was last updated on January 24, 2023, with version 4.4. Updates typically include optimizations and compatibility improvements for newer iOS versions.

### What are the main features for productivity?

Key productivity features include the ability to plot unlimited projects, create reusable templates, customize chart elements like colors and lines, and dynamically update properties as you plot points.

### Is ASHRAE Psychrometric Chart suitable for beginners?

The app is designed for HVAC professionals and students, offering advanced customization and plotting capabilities. While interactive, a basic understanding of psychrometrics would be beneficial for optimal use.

## Version history (last 5 releases)

### 4.4 — 2023-01-24

1. Optimized for iOS 16
2. Updated user-interface
3. Works with iPad Mini
4. Updated help

### 3.1 — 2019-12-20

1. Fixed issue with negative numbers not showing in iOS 13.
2. Fixed issue so that it works in "dark mode" in iOS 13
3. Optimized for iPad Pro
4. Updated help

### 2.3 — 2016-06-06

1. Updated user interface issues
2. Fixed email crashing issue that occurs in iOS 9 version

### 2.2 — 2015-09-17

1. Optimized for iOS 8

2. Updated user interface

3. Fixed issue with English/Metric conversion in email

4. Updated help

### 2.0 — 2014-10-30

1. Updated for iOS 7 and 8
2. Updated icons and help

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## More apps by ASHRAE, Inc.

- [HVAC ASHRAE 62.1](https://appshunter.io/ios/app/hvac-ashrae-621/id375374905)
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- [ASHRAE HVAC PT Chart](https://appshunter.io/ios/app/ashrae-hvac-pt-chart/id1273373336)

All apps by ASHRAE, Inc.: https://appshunter.io/developer/375374912

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-03.*