The HVAC Psychrometric LT application allows you to easily perform single-state HVAC psychrometric calculations. This psychrometric application is unique amongst all other iPhone psychrometric apps in the following ways:

1. Select and update all input parameters and view the calculated results all in the same screen without switching from one screen to another.
2. Select from 23+ different combinations of any 2 input parameters such as "Humidity Ratio / Dewpoint Temperature" and much more.
3. 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.
4. Send an HTML email and spreadsheet attachment of all psychrometric inputs and results.

This application 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 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.


You can also send an HTML email of all inputs and results along with a spreadsheet attachment. This allows you to perform further analysis on your desktop computer.


The HVAC Psychrometric LT application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, our software currently powers the analysis capabilities of Autodesk's (makers of AutoCAD) 3D modeling software tools. Also, ASHRAE has hired Carmel to custom develop the mobile apps for their various standards.

Click here to go to Apple iTunes to download the HVAC Psychrometic LT app.