# Flux HVAC vs UnitDown AI

The clearest difference is in-app purchases: Flux HVAC at none against UnitDown AI's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. UnitDown AI sells 2 in-app purchases, starting at $4.99 per month. Flux HVAC asks for nothing beyond the download.

## The numbers

| Metric | Flux HVAC | UnitDown AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/flux-hvac-tech-calculator/id6756405485/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Monetization | Free | — |
| Size | 38 MB | 8 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [华 陆](https://appshunter.io/developer/1589633448) | [JESUS ESCAMEA](https://appshunter.io/developer/1896505910) |

## What reviewers say

### Flux HVAC

[App page](https://appshunter.io/ios/app/flux-hvac-tech-calculator/id6756405485)

This professional toolkit helps HVAC technicians diagnose issues, charge systems accurately, and validate work with essential calculators. It offers offline functionality for superheat, subcooling, duct sizing, system performance, psychrometrics, and capacitor testing.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### UnitDown AI

[App page](https://appshunter.io/ios/app/unitdown-ai/id6767750626)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnitDown AI Pro | $4.99 | per month |
| UnitDown Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is Flux HVAC free?

Flux HVAC is free to download, with no in-app purchases.

### Is UnitDown AI free?

UnitDown AI is free to download, with in-app purchases available.

### Do Flux HVAC or UnitDown AI have ads?

Neither Flux HVAC nor UnitDown AI shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*