# Flux HVAC: Tech Calculator — Superheat, Duct & PT Chart

> HVAC technician's offline toolkit for system diagnostics and calculations. (iPhone/iPad app by 华 陆.)

- Source: https://appshunter.io/ios/app/flux-hvac-tech-calculator/id6756405485 (this page in markdown: same URL + `.md`)
- Developer: [华 陆](https://appshunter.io/developer/1589633448)
- Category: Utilities, Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 38 MB
- Languages: American English
- Released: 2025-12-17
- Data updated: 2026-09-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/flux-hvac-tech-calculator/id6756405485/reviews.md

## What is Flux HVAC?

STOP GUESSING. START MEASURING.

Flux HVAC is the modern, professional toolkit designed for the 2025 technician. We combined the essential tools into one lightning-fast app, helping you diagnose issues faster, charge systems accurately, and validate your work with confidence.

Whether you are on a scorching roof or in a crawl space with no signal, Flux HVAC works 100% offline.

KEY FEATURES:

1. PRECISION CHARGING
- Superheat Calculator: Accurate targets for non-TXV (fixed orifice/piston) systems.
- Subcooling Calculator: Precise liquid line verification for TXV systems.
- Visual Indicators: Clear color-coded sliders tell you exactly when your charge is optimized.
- Includes pre-loaded data for standard refrigerants (R-410A, R-22, etc.).

2. VISUAL DUCTULATOR (Duct Sizing)
- Forget the cardboard wheel. Calculate round and rectangular duct sizes in seconds.
- Interactive Visualizer: See the duct shape change as you adjust dimensions.
- Velocity Alerts: Automatic warnings for high FPM to prevent noisy systems.

3. SYSTEM PERFORMANCE (Capacity Check)
- Prove you fixed it. Enter Return and Supply air temps to calculate actual BTUs and Tons.
- Verify Delta T, Enthalpy change, and Sensible vs. Latent cooling capacity.
- The ultimate tool for "Verify & Bill."

4. PSYCHROMETRICS
- Instantly calculate Relative Humidity (RH%), Dew Point, and Enthalpy.
- Quickly diagnose humidity issues based on dry bulb and wet bulb readings.

5. CAPACITOR TEST (Under Load)
- Test capacitors without disconnecting wires.
- Input Volts and Amps to identify weak or failed capacitors before they damage the compressor.

WHY CHOOSE FLUX HVAC?
- Built for Speed: Large sliders and buttons designed for gloved hands.
- Offline First: No internet required for calculations.
- Visual Feedback: High-contrast interface designed for outdoor visibility.

Download Flux HVAC today and carry a master technician's toolkit in your pocket.

## Key features

- Superheat and Subcooling Calculators
- Duct Sizing with Visualizer
- System Performance (BTU/Ton) Calculation
- Psychrometric Calculations (RH%, Dew Point)
- Capacitor Test (Under Load)
- 100% Offline Functionality

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/flux-hvac-tech-calculator/id6756405485/reviews.md

### 5/5 — Finally a clean HVAC app that actually works offline

*2025-12-19*

I’ve been looking for a solid all-in-one toolkit like this for a while. Most other hvac calculator apps are either super outdated or require internet. which is useless when l’m in a basement or on a commercial roof with no signal.
The UI is super clean. I really like the visual sliders for superheat and subcooling—makes checking the charge way faster than typing in numbers. The built-in ductulator is also spot on for quick duct sizing checks. Also handy to have the capacitor test and airflow tools in the same place. Replaced 3 different apps on my phone. Highly recommend for any service tech.

## Frequently asked questions about Flux HVAC

### Does Flux HVAC have ads?

Flux HVAC is completely free and does not contain any advertisements.

### What is the rating for Flux HVAC?

Flux HVAC has an excellent rating of 5.0 stars based on 1 review.

### Can I use Flux HVAC without an internet connection?

Yes, Flux HVAC is designed to work 100% offline, making it ideal for use in areas with no signal.

### What types of systems does the Superheat Calculator support?

The Superheat Calculator provides accurate targets for non-TXV systems, such as those with fixed orifices or pistons.

### What devices is Flux HVAC available on?

Flux HVAC is available for iPhone, iPad, and iPod devices.

### What is the age rating for Flux HVAC?

Flux HVAC has an age rating of 4+, making it suitable for a wide range of users.

### How often is Flux HVAC updated?

Flux HVAC was last updated on December 17, 2025, with version 1.0.0.

### What refrigerants are pre-loaded in Flux HVAC?

Flux HVAC includes pre-loaded data for standard refrigerants such as R-410A and R-22.

## Version history (last 1 release)

### 1.0.0 — 2025-12-17

No release notes.

## More apps by 华 陆

- [Mint Offline Music Player](https://appshunter.io/ios/app/mint-offline-music-player/id6749923396)
- [PickleScore: Pickleball Keeper](https://appshunter.io/ios/app/picklescore-pickleball-keeper/id6755645259)

All apps by 华 陆: https://appshunter.io/developer/1589633448

## Related topics

[basecalc hvac calculator](https://appshunter.io/ios/topics/basecalc-hvac-calculator)

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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 2026-09-07.*