# HVAC Refrigerant PT vs Digiduct

The clearest difference is price: Digiduct at Free against HVAC Refrigerant PT's $6.99. Digiduct also leads on update cadence (every 2 months vs every 13 months). HVAC Refrigerant PT's advantage is ratings volume (64 vs 11) and iOS requirement (15.6 vs 26.2). On rating, ads, in-app purchases and device support there is nothing between them.

Digiduct is free to download; HVAC Refrigerant PT costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.8 for HVAC Refrigerant PT against 4.6 for Digiduct. That said, the two scores are not equally well evidenced: HVAC Refrigerant PT has 64 ratings behind it against 11, so its average is the more settled of the two.

HVAC Refrigerant PT ships an update every 13 months, Digiduct every 2 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | HVAC Refrigerant PT | Digiduct |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[4.8 (64 ratings)](https://appshunter.io/ios/app/hvac-refrigerant-pt/id633380165/reviews)** | [4.6 (11 ratings)](https://appshunter.io/ios/app/digiduct/id6738926359/reviews) |
| Number of ratings | **64** | 11 |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 1 MB | 4 MB |
| Requires iOS | **15.6** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cyberprodigy LLC](https://appshunter.io/developer/510284906) | [Syska Hennessy Group](https://appshunter.io/developer/1782943081) |

## What reviewers say

### HVAC Refrigerant PT

[App page](https://appshunter.io/ios/app/hvac-refrigerant-pt/id633380165)

This utility app provides HVAC professionals with essential refrigerant pressure and temperature charts, along with detailed physical properties for numerous refrigerants. It offers customizable units for temperature and pressure, making it a comprehensive tool for air conditioning system diagnostics and maintenance.

**Highlights:** Refrigerant pressure/temperature (PT) charts, Bubble and Dew Point data, Customizable temperature units (C/F), Selectable pressure units (psig, kPa, psia, etc.), Detailed refrigerant physical properties, Color code information

**Features:** macOS Compatibility

**In-app purchases:** none


### Digiduct

[App page](https://appshunter.io/ios/app/digiduct/id6738926359)

This HVAC tool assists professionals with duct sizing calculations based on ASHRAE standards. It supports multiple duct shapes and offers intelligent features to ensure accurate and reliable designs for real-world scenarios.

**Highlights:** Duct sizing for rectangular, round, and flat oval ducts, Customizable dimensions with locked values, Duct location intelligence for context-aware sizing, Calculations based on CFM, pressure drop, or velocity, Alerts for exceeding pressure drop or velocity limits

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Refrigerant PT free?

HVAC Refrigerant PT costs $6.99, with no in-app purchases.

### Is Digiduct free?

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

### Which has better reviews, HVAC Refrigerant PT or Digiduct?

HVAC Refrigerant PT is rated higher. HVAC Refrigerant PT averages 4.8 out of 5 from 64 ratings, while Digiduct averages 4.6 from 11 ratings.

### Do HVAC Refrigerant PT or Digiduct have ads?

Neither HVAC Refrigerant PT nor Digiduct shows ads.

### Which is updated more often, HVAC Refrigerant PT or Digiduct?

HVAC Refrigerant PT ships an update every 13 months, and Digiduct every 2 months. Most recently, HVAC Refrigerant PT was updated on November 1, 2026 and Digiduct on November 4, 2026.

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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.*