# AirCalc Psychrometric — HVAC Calculator for Engineers

> HVAC Calculator for Engineers (iPhone/iPad app by Duong Nguyen Huu.)

- Source: https://appshunter.io/ios/app/aircalc-psychrometric/id6762062746 (this page in markdown: same URL + `.md`)
- Developer: [Duong Nguyen Huu](https://appshunter.io/developer/1887479789)
- Category: Productivity, Utilities
- Price: $1.99
- Age rating: 4+
- Requires: iOS 15.1 · 26 MB
- Languages: American English
- Released: 2026-04-14
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/aircalc-psychrometric/id6762062746/reviews.md

## What is AirCalc Psychrometric?

AirCalc Pro is a professional-grade psychrometric calculator and HVAC engineering toolkit designed for HVAC engineers, mechanical engineers, and building science professionals.

Enter any two air properties and instantly compute all eight psychrometric parameters — no internet connection required.

CORE FEATURES

• Psychrometric Calculator
Select any 2 of 8 parameters as inputs: Dry Bulb Temperature, Relative Humidity, Absolute Humidity,      
Humidity Ratio, Dew Point, Wet Bulb Temperature, Enthalpy, and Specific Volume. The app instantly        
calculates all remaining values.

• Interactive Psychrometric Chart
Visualize air states on a real-time psychrometric diagram. Tap or drag the state point to explore        
different conditions. The chart displays relative humidity curves (10%–100%), constant enthalpy lines,   
saved state points, and coil process lines with SHR direction.

• 27 Input Combinations
Supports 27 valid input pair combinations with robust solvers including direct computation and
Newton-Raphson iteration for complex pairs.

ENGINEERING TOOLS

• Load Calculator
Enter airflow rate (CFM or m³/h) with supply and return air states to calculate total, sensible, and     
latent cooling/heating loads, moisture removal rate, and condensate rate.

• Mixed Air Calculator
Blend outdoor air and return air by percentage to calculate the mixed air state. Useful for AHU,
economizer, and ventilation analysis.

• Coil Process Analyzer
Analyze entering and leaving air conditions across a coil. Calculates Sensible Heat Ratio (SHR),
total/sensible/latent capacity, dehumidification status, and condensate rate.

• Save & Compare States
Save air states with custom labels. Compare any two saved states side-by-side with color-coded deltas for
all parameters. Saved states also appear as numbered points on the psychrometric chart.

• PDF Export
Generate and share professional psychrometric reports as PDF directly from the app.

SETTINGS & LOCALIZATION

• Unit Conversion: switch between °C/°F and kPa/atm
• 8 Languages: English, Japanese (日本語), Chinese (中文), Korean (한국어), Thai (ไทย), Vietnamese (Tiếng
Việt), German (Deutsch), and Spanish (Español)
• Auto-detects device language on first launch

TECHNICAL DETAILS

• Based on standard psychrometric equations (Magnus formula, ASHRAE reference methods)
• Dry bulb temperature range: -20°C to 90°C
• Standard atmospheric pressure: 101.325 kPa (adjustable)
• All calculations performed locally — fully offline
• Results in under 10 milliseconds

DESIGNED FOR

• HVAC system design and commissioning
• Indoor air quality analysis
• Building energy audits
• Mechanical engineering coursework
• Clean room and data center climate control
• Agricultural and food processing environments

AirCalc Pro delivers the accuracy of psychrometric reference tables with the convenience of a modern     
mobile interface. One purchase, no subscriptions, no ads, no data collection.


## Version history (last 3 releases)

### 1.0.2 — 2026-04-29

Bug fixes and performance improvements.

### 1.0.1 — 2026-04-20

• Load Calculator — compute total, sensible, and latent loads from airflow and air states
• Mixed Air Calculator — blend outdoor and return air by ratio
• Coil Process Analyzer — SHR, capacity breakdown, dehumidification check
• Save & Compare — save air states, compare side-by-side with deltas
• PDF Export — generate and share psychrometric reports
• Process lines and saved state points on the psychrometric chart
• Auto-detect device language on first launch
• Redesigned tab bar with icons
• Keyboard handling improvements

### 1.0 — 2026-04-14

No release notes.

## More apps by Duong Nguyen Huu

- [Tích Sản: Giá Vàng & Tài Sản](https://appshunter.io/ios/app/tich-san-gia-vang-and-tai-san/id6761044270)
- [PDFScan Go](https://appshunter.io/ios/app/pdfscan-go/id6761462436)
- [Daily Health Reminder App](https://appshunter.io/ios/app/daily-health-reminder-app/id6762444133)
- [Meno Health Tracker](https://appshunter.io/ios/app/meno-health-tracker/id6762710155)
- [Barber Việt Nam](https://appshunter.io/ios/app/barber-viet-nam/id6763964976)

All apps by Duong Nguyen Huu: https://appshunter.io/developer/1887479789

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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 2026-08-24.*