# HVAC Load Plus vs Ductulator

The clearest difference is price: Ductulator at $3.99 against HVAC Load Plus's $24.99. Ductulator also leads on rating (4.7 vs 2.8) and in-app purchases (none vs 1). HVAC Load Plus's advantage is review sentiment (60% vs 50%) and iOS requirement (13.0 vs 18.6). On ads and device support there is nothing between them.

HVAC Load Plus costs $24.99 and Ductulator $3.99 up front. HVAC Load Plus sells 1 one-off in-app purchase. Ductulator asks for nothing beyond the download.

Ductulator holds the better App Store score, 4.7 against 2.8. That said, the two scores are not equally well evidenced: Ductulator has 361 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 60% of HVAC Load Plus's written reviews are positive against 50% of Ductulator's, so the app with the better star average is not the one people write more warmly about.

HVAC Load Plus ships an update every 9 months, Ductulator every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | HVAC Load Plus | Ductulator |
| --- | --- | --- |
| Price | $24.99 | **$3.99** |
| Rating | [2.8 (5 ratings)](https://appshunter.io/ios/app/hvac-load-plus/id381608273/reviews) | **[4.7 (361 ratings)](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475/reviews)** |
| Number of ratings | 5 | **361** |
| Positive reviews | **60.0% 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 | — | **#41** |
| Size | 18 MB | 1 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | iPhone, 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 Load Plus

[App page](https://appshunter.io/ios/app/hvac-load-plus/id381608273)

Perform detailed heating and cooling load calculations for buildings in the field using your iPhone. Access a vast weather database and construction data to generate comprehensive reports that can be emailed or exported to spreadsheets.

**Highlights:** Detailed heating and cooling load calculations, 1000+ city weather database, Extensive construction type data, Unlimited project creation and storage, Comprehensive load breakdown reports, Emailable HTML reports with spreadsheet attachments, Company information display on reports

**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:** #41 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 Load Plus free?

HVAC Load Plus costs $24.99, and also offers in-app purchases.

### Is Ductulator free?

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

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

Ductulator is rated higher. HVAC Load Plus averages 2.8 out of 5 from 5 ratings, while Ductulator averages 4.7 from 361 ratings.

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

Neither HVAC Load Plus nor Ductulator shows ads.

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

HVAC Load Plus ships an update every 9 months, and Ductulator every 2 months. Most recently, HVAC Load Plus was updated on November 1, 2026 and Ductulator on November 3, 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.*