# HVAC Psychrometric LT — Single-air stream psych calcs

> HVAC psychrometric calculator for single-air stream analysis on iOS devices. (iPhone/iPad app by Carmel Software Corporation.)

- Source: https://appshunter.io/ios/app/hvac-psychrometric-lt/id348669920 (this page in markdown: same URL + `.md`)
- Developer: [Carmel Software Corporation](https://appshunter.io/developer/317970398)
- Category: Productivity, Business
- Price: $0.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 15.6 · 18 MB
- Languages: American English
- Released: 2010-01-19
- Data updated: 2026-09-06
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hvac-psychrometric-lt/id348669920/reviews.md

## What is HVAC Psychrometric LT?

The "HVAC Psychrometric LT" app is the #1 selling psychrometric application for the Apple iPhone and iPad. Tens of 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 LT is a universal app that it is optimized for both the iPhone and iPad.

2. This app was developed by Carmel Software, a company that has been developing software for 20+ years. We are experts in software design and HVAC analysis.

3. It allows you to quickly and easily perform single-state 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 

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 LT" 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 HVAC psychrometric calculations
- Universal app for iPhone and iPad
- All inputs and results on one screen
- 23 input parameter combinations
- Real-time results with slider control
- Export results via HTML email and spreadsheet

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

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


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/hvac-psychrometric-lt/id348669920/reviews.md

### 1/5 — Not good

*2017-01-26*

I don't like at all. It doesn't let to change values.

### 5/5 — Simple and inexpensive

*2014-10-03*

This app is awesome for the price (99 cents). Works on both my iPhone and iPad and looks great. Also works for me up here in Denver where the air density is low. Great app.

### 4/5 — Nice app

*2014-09-17*

I use this app to track mill conditions in the plant I manage. We spin cotton and polyester yarns and both temp and RH play a key role in processes running well.

### 5/5 — Works great

*2010-09-09*

I wanted an app that calculates Humidity ratio in metric. This does it simply, cleanly and with little effort. I can plug in my measurements and get my result right away without going to the charts. I can also check that my measurements are correct with the various input options. I will consider their other apps.

## Frequently asked questions about HVAC Psychrometric LT

### What is HVAC Psychrometric LT?

HVAC Psychrometric LT is a paid application for iPhone and iPad that allows users to perform single-air stream psychrometric calculations. It offers a user-friendly interface for inputting parameters and viewing results.

### How does HVAC Psychrometric LT calculate results?

The app allows you to select from 23 different combinations of any two input parameters, such as humidity ratio and dewpoint temperature. Results are updated immediately as you change input values using an on-screen slider control.

### Can I export my calculations from HVAC Psychrometric LT?

Yes, you can send an HTML email and a spreadsheet attachment of all single-state and mixed-air inputs and results directly from the app.

### What units does HVAC Psychrometric LT support?

You can specify additional parameters such as altitude and atmospheric pressure, and choose between different unit systems like degrees F or R, and English or Metric units.

### Is HVAC Psychrometric LT available on Android?

HVAC Psychrometric LT is currently only available for Apple iPhone and iPad devices. It is a universal app optimized for both platforms.

### How often is HVAC Psychrometric LT updated?

The app was last updated on December 19, 2025, indicating regular maintenance and potential feature additions. The current version is 6.1.

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

HVAC Psychrometric LT is a paid application priced at $0.99. There are no advertisements or in-app purchases mentioned for this specific application.

### What age rating does HVAC Psychrometric LT have?

HVAC Psychrometric LT has an age rating of 4+, making it suitable for a wide range of users. It is designed for productivity and engineering tasks.

## Version history (last 5 releases)

### 6.1 — 2025-12-19

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.

### 5.97 — 2024-02-29

1. Recompiled for iOS 17.
2. Updated help.
3. Added required user-facing purpose string

### 5.5 — 2023-03-02

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

### 4.8 — 2020-08-07

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

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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

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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 2026-09-06.*