# HVAC Toolkit vs Duct Construction

The clearest difference is review sentiment: HVAC Toolkit at 73% against Duct Construction's 0%. HVAC Toolkit also leads on rating (5.0 vs 1.0) and iOS requirement (13.0 vs 17.6). Duct Construction's advantage is price ($0.99 vs $23.99) and chart position (#76 vs unranked). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

HVAC Toolkit costs $23.99 and Duct Construction $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HVAC Toolkit holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 73% of HVAC Toolkit's written reviews are positive against 0% of Duct Construction's.

HVAC Toolkit ships an update every 6 months, Duct Construction every 10 months. The most recent releases landed on September 14, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | HVAC Toolkit | Duct Construction |
| --- | --- | --- |
| Price | $23.99 | **$0.99** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hvac-toolkit/id354558963/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/duct-construction/id6443518338/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **73.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 10 months |
| Monetization | Paid | Paid |
| Best chart rank | — | **#76** |
| Size | 50 MB | 1 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### HVAC Toolkit

[App page](https://appshunter.io/ios/app/hvac-toolkit/id354558963)

This comprehensive toolkit offers essential HVAC calculations and tools for professionals. It combines multiple specialized applications into a single, convenient package for iPhone and iPad users.

**Highlights:** Equipment tracking and customization, Refrigerant pressure-temperature charts, Refrigerant charge calculations, Duct sizing, Cooling and heating load calculations, Psychrometric calculations, Steam tables, Pipe sizing for liquid, steam, and gas

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

**In-app purchases:** none


### Duct Construction

[App page](https://appshunter.io/ios/app/duct-construction/id6443518338)

**Currently charting:** #76 Top Paid · Productivity (US App Store)

This app helps determine duct construction and reinforcement options based on duct size and system pressure class. It provides condensed lists of suitable options, saving time spent on manual calculations and table lookups. Results are based on industry standards for galvanized steel duct sheets.

**Highlights:** Duct size range from 2" to 120", Pressure classes up to 4 in.wg, Calculates duct weights per linear foot, Determines required duct gauge and reinforcement spacing, Clear illustrations for reinforcement types, Simple and effective UI design

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Toolkit free?

HVAC Toolkit costs $23.99, with no in-app purchases.

### Is Duct Construction free?

Duct Construction costs $0.99, with no in-app purchases.

### Which has better reviews, HVAC Toolkit or Duct Construction?

HVAC Toolkit is rated higher. HVAC Toolkit averages 5.0 out of 5 from 2 ratings, while Duct Construction averages 1.0 from 1 ratings.

### Do HVAC Toolkit or Duct Construction have ads?

Neither HVAC Toolkit nor Duct Construction shows ads.

### Which is updated more often, HVAC Toolkit or Duct Construction?

HVAC Toolkit ships an update every 6 months, and Duct Construction every 10 months. Most recently, HVAC Toolkit was updated on September 14, 2026 and Duct Construction on September 25, 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.*