# HVAC Quick Load vs Ductulator

The clearest difference is rating: Ductulator at 4.7 against HVAC Quick Load's 3.3. Ductulator also leads on in-app purchases (none vs 1) and ratings volume (317 vs 3). On review sentiment, ads, device support and iOS requirement there is nothing between them.

HVAC Quick Load costs $6.99 and Ductulator $3.99 up front. HVAC Quick Load sells 1 one-off in-app purchase. Ductulator asks for nothing beyond the download.

Ductulator holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: Ductulator has 317 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 45% of HVAC Quick Load's written reviews are positive against 50% of Ductulator's.

HVAC Quick Load ships an update every 9 months, Ductulator every 2 months. The most recent releases landed on September 22, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | HVAC Quick Load | Ductulator |
| --- | --- | --- |
| Price | $6.99 | **$3.99** |
| Rating | [3.3 (3 ratings)](https://appshunter.io/ios/app/hvac-quick-load/id365781247/reviews) | **[4.7 (317 ratings)](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475/reviews)** |
| Number of ratings | 3 | **317** |
| Positive reviews | 45.5% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Best chart rank | — | **#53** |
| Size | 1 MB | 1 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, iPad | 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 Quick Load

[App page](https://appshunter.io/ios/app/hvac-quick-load/id365781247)

This app provides quick, rule-of-thumb HVAC load calculations for various building types. It estimates heating and cooling loads, as well as air flows, based on building type, area, and occupancy. Results can be emailed with an Excel spreadsheet attachment for further analysis.

**Highlights:** Rule-of-thumb HVAC load calculations, Supports commercial, industrial, and residential buildings, Estimates cooling/heating loads and air flows, Email results with Excel spreadsheet attachment, IP and SI unit support, HVAC Equipment Locator included

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475)

**Currently charting:** #53 Top Paid · Productivity (US App Store)

Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.

**Highlights:** Instant duct sizing, Friction rate or velocity calculation, Multiple valid duct dimensions, IP and SI units support, Detailed sizing mode, Rectangular, circular, and flexible ducts

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

**In-app purchases:** none

**What reviewers like**

- 👍 Very helpful for duct sizing
- 👍 Easy to use in the field
- 👍 Saves time
- 👍 Seamless imperial/metric transitions
- 👍 Excellent tool for duct design

**What reviewers complain about**

- 👎 App should be free
- 👎 Functionality is pointless for some needs
- 👎 Doesn't help with traditional residential HVAC duct sizing
- 👎 App is a scam
- 👎 Decimal point doesn't work

**Reported bugs**

- Decimal point doesn't work on calculator
- New flex option isn't working properly
- Friction rate can't be changed in the latest version
- Skips duct sizes (e.g., 24-26)

**Requested features**

- Ability to pick duct size and see CFM
- Include flat oval ducts
- Option to select round or square duct
- Ability to enter duct size and get CFM
- Option for flex duct


## Frequently asked questions

### Is HVAC Quick Load free?

HVAC Quick Load costs $6.99, and also offers in-app purchases.

### Is Ductulator free?

Ductulator costs $3.99, with no in-app purchases.

### Which has better reviews, HVAC Quick Load or Ductulator?

Ductulator is rated higher. HVAC Quick Load averages 3.3 out of 5 from 3 ratings, while Ductulator averages 4.7 from 317 ratings.

### Do HVAC Quick Load or Ductulator have ads?

Neither HVAC Quick Load nor Ductulator shows ads.

### Which is updated more often, HVAC Quick Load or Ductulator?

HVAC Quick Load ships an update every 9 months, and Ductulator every 2 months. Most recently, HVAC Quick Load was updated on September 22, 2026 and Ductulator on October 15, 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.*