# HVAC Psychrometric Plus — Single/mixed-air psych calcs

> HVAC psychrometric calculator for single and mixed air streams. (iPhone/iPad app by Carmel Software Corporation.)

- Source: https://appshunter.io/ios/app/hvac-psychrometric-plus/id348669031 (this page in markdown: same URL + `.md`)
- Developer: [Carmel Software Corporation](https://appshunter.io/developer/317970398)
- Category: Productivity, Business
- Price: $6.99 with in-app purchases
- Rating: 3.00/5 from 2 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 17 MB
- Languages: American English
- Released: 2010-01-15
- Data updated: 2026-08-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hvac-psychrometric-plus/id348669031/reviews.md

## What is HVAC Psychrometric Plus?

The "HVAC Psychrometric Plus" app is the #1 selling psychrometric application for the Apple iPhone and iPad. Thousands of happy users have downloaded this useful application for performing quick and simple psychrometric analysis. Just a few reasons why you should buy this application:

1. The Psych Plus is a universal app that it is optimized for the iPhone and iPad.

2. This app was developed by Carmel Software, a company that has been developing software for 25+ years. We are experts in software design and HVAC analysis.

3. It allows you to easily perform single-state and mixed-air HVAC psychrometric calculations.

4. Select and update all input parameters and view the calculated results all in the same screen without switching from one screen to another.

5. Select from 23 different combinations of any 2 input parameters such as "Humidity Ratio / Dewpoint Temperature" and much more.

6. Immediately view updated results as you change the input values using the on-screen slider control. You can specify how much to increase or decrease values as you slide the indicator along the slider mechanism.

7. Send an HTML email and a spreadsheet attachment of all of the single-state and mixed-air inputs and results

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

This application contains two separate input modes. The 1st input mode is the "Single-State" mode that allows you to specify 2 psychrometric parameters for a single stream of air and view the remaining 6 calculated values. You can quickly toggle through 23 different combinations of the 2 input parameters and instantly view the calculated results, all on the same screen.

The 2nd input mode is the "Mixed-Air" mode that allows you to specify 2 psychrometric parameters for each of two air streams to calculate the mixed air psychrometric conditions. Once again, you can toggle through 23 combinations of the 2 input parameters and view all results in one screen.

The following input and output value-types are displayed:

1. Dry-bulb temperature
2. Humidity ratio
3. Relative Humidity
4. Wet-bulb temperature
5. Partial pressure
6. Enthalpy
7. Specific volume
8. Dewpoint temperature
9. Total airflow or mass flow (for mixed-air calcs, only)

You can specify additional parameters such as the altitude of the air being analyzed, the atmospheric pressure, different types of units such as degrees F or R, and English or Metric units.

The "HVAC Psychrometric Plus" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our analysis software and incorporated it into their leading Autodesk Revit software product. In addition, ASHRAE has hired Carmel Software to develop custom mobile apps to accompany their various standards.

We also offer the following apps for the iPhone/iPad:

1. HVAC Residential Load Calcs
2. HVAC Load Plus
3. HVAC Duct Sizer
4. HVAC Pipe Sizer – Gas Low Pressure
5. HVAC Pipe Sizer - Gas High Pressure
6. HVAC Pipe Sizer – Liquid
7. HVAC Pipe Sizer – Steam
8. Steam Tables
9. HVAC Toolkit
10. Psychrometric LT
11. HVAC Pipe Sizer Plus
12. HVAC Pipe Sizer Gas Plus
13. HVAC Quick Load
14. HVAC ResLoad-J
15. HVAC Equipment Locator
16. HVAC Psych HD

## Key features

- Single-state psychrometric calculations
- Mixed-air psychrometric calculations
- 23 input parameter combinations
- Real-time result updates
- Universal app for iPhone and iPad
- Email and spreadsheet export

## Pricing and in-app purchases

Base price: $6.99.

**One-time purchases**

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


## Chart rankings

- #199 in Top Paid · Productivity (US App Store)

## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/hvac-psychrometric-plus/id348669031/reviews.md

### 5/5 — Works great!

*2019-06-20*

Easy to use and accurate. Use it every day.

### 1/5 — Engineer

*2016-08-12*

Does not work. 72/46 is not -7.6 dew point. How to get refund is the ??

### 1/5 — Don't buy

*2015-08-30*

This app will give you false readings I can calculate better and more accurate than this app if you need one then go to Ashrae HVAC Psychrometeric chart apps and download  that it will cost you $20.00 but you pay for what you get !!!!!!!!!! This app is crap DONT but this app.😖

### 1/5 — Now very Good

*2012-07-20*

Answer Not really Good...

### 5/5 — R&D Use

*2012-04-30*

Four senior R&D execs in our company use it and have never had a problem in F or C. Easy conversion and more flexible than most other apps. There is a small error near 0degF and tiny inconsistencies near saturation but these would only be noticed by a scientist. Great app. Is it available for Excel?

### 4/5 — 간단하게 사용하긴 좋으나 LT버전과 큰 차이가 없네요...

*2011-01-26*

SI 단위계 지원되고 사용도 간편해서 좋습니다. 이메일로 보내는 기능도 유용할것 같구요.

근데 LT버전과의 차이가 Mixed 상태 표시해주는건데, 

저는 이것보다는 Inlet 과 Outlet 상태값 넣고 

열교환량, 제습량을 계산해주는게 있었으면 더 유용하지 않았을까 싶네요.

Mixed 자주 쓰실게 아니라면 LT버전이 나을듯 합니다. 

그래도 두가지 상태값 동시에 볼수있다는 점에서는 LT버전보다는 낫네요. : )

### 5/5 — Great app for mechanical engineering students

*2010-05-17*

It's a very useful app when doing homework instead of looking
for the results in the psych charts and especially when it comes to
interpolation. I haven't run into any inaccuracies, yet. Also, I like
that I can calculate for different elevations and barometric
pressures. I highly recommend this app.

### 5/5 — Beats using those cardboard psych calculators

*2010-05-09*

I have one of those cardboard Vaisala psych calculators, kind of like a ductulator but for psych. calcs. Anyway, I've been using it for years and it was ok. Now, that I've downloaded this app, I much prefer this: it's quick, let's me specify a large # of input parameters, and instantly displays the results. Good stuff.

I also like the fact I can calculate for high elevations since I live in Denver.

Great work!!!

### 5/5 — Works great out in the field for HVAC diagnostics

*2010-05-04*

I am doing a lot of diagnostics these days with cooling coils, etc. I really need to do lots psych calcs to determine what the wet-bulb and relative humidity values are. This app is awesome in the field for doing this. Also, I like the mixed-air function for those more complicated jobs. Great work.

### 4/5 — Great app but...

*2010-02-20*

I've used this app many times in my hvac class and all the values are correct other than enthalpy.  So be sure to compare that value to the actual chart because it is way off.  I sent a thing to the developers so hopefully the issue can be resolved.  The odd thing is that the value for enthalpy when using the mixed stream is correct.

## Frequently asked questions about HVAC Psychrometric Plus

### What types of psychrometric calculations can HVAC Psychrometric Plus perform?

HVAC Psychrometric Plus can perform both single-state and mixed-air psychrometric calculations. It allows you to input two psychrometric parameters for a single air stream or for two separate air streams to calculate the mixed air conditions.

### How many input parameter combinations does HVAC Psychrometric Plus offer?

The app offers 23 different combinations of any two input parameters for calculations. This provides flexibility in defining the air conditions you need to analyze.

### Can I see the results update in real-time with HVAC Psychrometric Plus?

Yes, you can immediately view updated results as you change input values using the on-screen slider control. You can specify how much to increase or decrease values as you slide the indicator.

### Does HVAC Psychrometric Plus support different units of measurement?

Yes, you can specify additional parameters such as altitude and atmospheric pressure, and choose between different units of measurement, including degrees Fahrenheit or Rankine, and English or Metric units.

### Can I export my calculation results from HVAC Psychrometric Plus?

Yes, you can send an HTML email and a spreadsheet attachment of all single-state and mixed-air inputs and results. This makes it easy to share and document your calculations.

### What devices is HVAC Psychrometric Plus compatible with?

HVAC Psychrometric Plus is a universal app optimized for both iPhone and iPad. It is also compatible with iPod devices.

### How often is HVAC Psychrometric Plus updated?

The app was last updated on December 18, 2025, with version 6.1. This indicates a history of ongoing development and support from the developer.

### What is the price of HVAC Psychrometric Plus?

HVAC Psychrometric Plus is a paid application priced at $6.99. There are no advertisements or in-app purchases mentioned for this app.

## Version history (last 5 releases)

### 6.1 — 2025-12-18

1. Added a Share button to the iPhone and iPad versions of the app, so you can now text, email, and download reports.
2. Updated help.
3. Optimized for iOS 26.

### 5.5 — 2023-03-01

1. Optimized for iOS 16 and iPhone 14
2. Updated help

### 5.2 — 2021-11-17

1. Optimized for iOS 14 and iPhone 13
2. Updated help
3. Updated launch icons

### 4.95 — 2020-08-07

1. Fixed issue where email icon was not displaying in iPad version

### 4.9 — 2020-07-30

1. Updated Google Analytics and Crashlytics

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## More apps by Carmel Software Corporation

- [HVAC Duct Sizer](https://appshunter.io/ios/app/hvac-duct-sizer/id317970395)
- [HVAC Pipe Sizer - Liquid](https://appshunter.io/ios/app/hvac-pipe-sizer-liquid/id325069065)
- [HVAC Pipe Sizer - Steam](https://appshunter.io/ios/app/hvac-pipe-sizer-steam/id336112747)
- [Steam Tables](https://appshunter.io/ios/app/steam-tables/id339948012)
- [HVAC Pipe Sizer - Gas Low](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-low/id341688321)
- [HVAC Pipe Sizer - Gas High](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-high/id341828523)

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

## Related topics

[flycarpet psychrometric chart](https://appshunter.io/ios/topics/flycarpet-psychrometric-chart) · [psychplus](https://appshunter.io/ios/topics/psychplus)

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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 2026-08-07.*