# HVAC PT Chart — HVAC Pressure/Temp Charts

> HVAC pressure-temperature calculator for over 100 refrigerants with data export. (iPhone/iPad app by Carmel Software Corporation.)

- Source: https://appshunter.io/ios/app/hvac-pt-chart/id508212589 (this page in markdown: same URL + `.md`)
- Developer: [Carmel Software Corporation](https://appshunter.io/developer/317970398)
- Category: Productivity, Business
- Price: Free with in-app purchases
- Rating: 4.00/5 from 8 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.1 · 27 MB
- Languages: American English
- Released: 2012-03-13
- Data updated: 2026-08-27
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/hvac-pt-chart/id508212589/reviews.md

## What is HVAC PT Chart?

HVAC PT Chart is an electronic pressure temperature calculator that allows HVAC technicians and contractors to quickly look up the temperature and corresponding pressure for 100+ common HVAC refrigerants including both bubble and dew versions of azeotropic (mixture) refrigerants. This is the only PT Chart app that allows you to email complete PT chart lists, refrigerant properties, and your inputted values/results.

This is a unique PT Chart app for the following reasons:

1. Works on both the Apple iPhone and iPad (and adjusts its screen according to the mobile device screen size, whether you are running it on the iPhone 13 or the iPad)

2. Optimized for iOS 16

3. Includes 100+ refrigerants

4. Allows you to input the temperature and then the corresponding pressure will display and vice versa.

5. Allows you to also use a slider control to specify the exact pressure or temperature to see the corresponding temperature or pressure

6. Displays a list of pressure/temperature values in 1 degree increments

7. Allows you to select the atmospheric pressure so as to show the true pressure-temperature relationship even for high elevations

8. Includes a database of 1000+ cities world-wide with elevation data that is used to derive atmospheric pressure

9. Display common properties for the selected refrigerant (oil type, GWP, composition, critical temp, boiling temp, and more...)

10. Email project inputs and properties for the selected refrigerant

11. Email the full pressure/temperature list for the selected refrigerant

12. Display units in both English and Metric

13. Includes both dew and bubble versions of any azeotropic (mixture) refrigerants

14. This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539

## Key features

- Pressure/temperature lookup for 100+ refrigerants
- Input temperature to find pressure, or vice versa
- Slider control for precise value selection
- Email complete PT chart lists and refrigerant properties
- Display common refrigerant properties
- Adjust for atmospheric pressure based on city elevation
- English and Metric unit options

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/hvac-pt-chart/id508212589/reviews.md

### 5/5 — Love this app

*2021-09-30*

I use it multiple times per day out in the field. I like that it has so many refrigerants in the list and I can also email.

### 3/5 — Dark Mode

*2019-10-20*

The app is great, but it’s almost unusable if your phone or tablet is in dark mode. Hopefully there’s an update to address that issue soon.

### 3/5 — Doesn’t work in dark mode

*2019-10-15*

Good overall UI. Just doesn’t display text in dark mode on the iPhone XS Max

### 5/5 — Practical and useful

*2016-12-05*

Exactly what I needed. Free app but wouldn't have minded paying for it. Gets the job done. Simple to use. Great all around app

### 5/5 — Great app

*2014-09-11*

So easy to find pressure temp

### 5/5 — Help to much

*2014-04-20*

So faster to find pressure and temp.

### 3/5 — Ui a little funny

*2013-01-19*

Have to agree, the refrig selection is spaced out bigger than needs be snd the data you need to read is shrunk a little. In the help there is mixed font sizes and no option to email devs.

For a self proclaimed big time computational programmers this app sure looks unpolished. And i wonder how their $50 and up apps look now... Its the small things that count.

### 1/5 — Fail

*2012-10-21*

Don't believe "For a limited time only, this app is FREE".  The fee has been taken from me!!!  Unbelievable that Apple would allow blatant theft.

This app does provide a lot of useful info, however the font is tiny!  And this app does not have a side by side refrigerant comparison which is often needed when critical repair decisions have to be made.

The hunt continues for an app that fills the needs of this HVACR professional.

### 4/5 — Pretty good but needs tweaking

*2012-06-20*

This PT chart app is probably the best on iTunes because it has every refrigerant on the planet, but the interface could be better. On my iPhone the refrigerant selection window takes up half the screen. That leaves a lot less space to view the temps and pressures I need. You guys need to shrink down the refrigerant selection window so it is easier to use the buttons and slider. Also it would free up space to make the readout windows a little bigger so it's easier to see the numbers. 

Other than that the app works great and is pretty accurate. The info is good, it just needs a better presentation.

## Frequently asked questions about HVAC PT Chart

### What refrigerants does HVAC PT Chart support?

HVAC PT Chart supports over 100 common HVAC refrigerants, including both bubble and dew versions of azeotropic refrigerants. It also displays common properties like oil type, GWP, and critical temperature for selected refrigerants.

### Can I email data from HVAC PT Chart?

Yes, HVAC PT Chart is unique in its ability to email complete PT chart lists, refrigerant properties, and your inputted values/results. This feature is useful for documentation and sharing information with colleagues or clients.

### How does HVAC PT Chart account for elevation?

The app includes a database of over 1000 cities worldwide with elevation data. This information is used to derive atmospheric pressure, allowing the app to show the true pressure-temperature relationship even at high elevations.

### What devices is HVAC PT Chart compatible with?

HVAC PT Chart is compatible with iPhone, iPad, and iPod devices, adjusting its screen size accordingly. It is optimized for iOS 16.

### How often is HVAC PT Chart updated?

The app was last updated on February 19, 2023, with version 5.4. This indicates a reasonable update frequency for a utility application.

### What is the user rating for HVAC PT Chart?

HVAC PT Chart has a rating of 4.0 stars from 8 ratings. This suggests generally positive user sentiment.

### Does HVAC PT Chart have ads?

No, HVAC PT Chart does not contain advertisements. It is a free application without any ads.

### What are the unit options in HVAC PT Chart?

HVAC PT Chart allows you to display units in both English and Metric systems, catering to different user preferences and regional standards.

## Version history (last 5 releases)

### 5.4 — 2023-02-19

Added new low GWP refrigerant: R-454B and R-454B (Dew)

### 5.3 — 2021-09-30

1. Fixed issue with PT list user interface overlapping top title bar
2. Fixed negative number issue

### 5.0 — 2021-09-29

1. Updated PT values
2. Updated ad engine

### 4.8 — 2020-07-28

1. Updated Google Analytics and Crashlytics

### 4.7 — 2020-05-06

1. Updated the app launch screen per Apple's new guidelines.

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## More apps by Carmel Software Corporation

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All apps by Carmel Software Corporation: https://appshunter.io/developer/317970398

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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 2026-08-27.*