# HVAC Load Plus vs testo Smart

The clearest difference is price: testo Smart at Free against HVAC Load Plus's $24.99. testo Smart also leads on update cadence (every 2 months vs every 9 months) and ratings volume (170 vs 5). HVAC Load Plus's advantage is review sentiment (60% vs 16%) and iOS requirement (13.0 vs 18.0). On rating, ads, in-app purchases and device support there is nothing between them.

testo Smart is free to download; HVAC Load Plus costs $24.99 up front. HVAC Load Plus sells 1 one-off in-app purchase and testo Smart sells 5 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 2.8 for HVAC Load Plus against 2.7 for testo Smart. That said, the two scores are not equally well evidenced: testo Smart has 170 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 60% of HVAC Load Plus's written reviews are positive against 16% of testo Smart's.

HVAC Load Plus ships an update every 9 months, testo Smart every 2 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | HVAC Load Plus | testo Smart |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | **[2.8 (5 ratings)](https://appshunter.io/ios/app/hvac-load-plus/id381608273/reviews)** | [2.7 (170 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) |
| Number of ratings | 5 | **170** |
| Positive reviews | **60.0% of reviews** | 16.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 18 MB | 195 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## 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 |


### testo Smart

[App page](https://appshunter.io/ios/app/testo-smart/id1482139629)

This app supports measurements for refrigeration, HVAC, and heating systems. It also aids in food safety, frying oil quality, and indoor climate monitoring. Quickly interpret data, create digital reports with photos, and send them via email.

**Highlights:** All-in-one system measurements, Graphical display of measured values, Digital PDF/CSV measurement reports, Email report sharing, Leak test analysis, Automatic refrigerant charging, Indoor air quality monitoring

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Multi-site measurement | $6.99 | per month |
| Air balancing | $9.99 | per month |
| Multi-site measurement | $69.90 | per year |
| Air balancing | $99.90 | per year |
| Logging digital manifold | $44.99 | one-time |

**What reviewers like**

- 👍 Good app with some features
- 🚀 Great product
- 🚀 Useful app for measurements

**What reviewers complain about**

- 🐛 App won't connect
- 🐛 Connectivity issues
- 🐛 Unreliable connection
- 🐛 Forced updates
- 🐛 Laggy and unresponsive UI

**Reported bugs**

- App won't connect to devices
- Compatibility issues with newer iOS versions
- Frequent crashes and freezes
- Inability to save favorite refrigerants
- Measurement data not displaying properly

**Requested features**

- Add option to toggle Bluetooth discovery
- Improve Bluetooth range
- Add ability to customize colors and graphs
- Improve data export functionality
- Add option to name sensors


## Frequently asked questions

### Is HVAC Load Plus free?

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

### Is testo Smart free?

testo Smart is free to download, with in-app purchases available.

### Which has better reviews, HVAC Load Plus or testo Smart?

HVAC Load Plus is rated higher. HVAC Load Plus averages 2.8 out of 5 from 5 ratings, while testo Smart averages 2.7 from 170 ratings.

### Do HVAC Load Plus or testo Smart have ads?

Neither HVAC Load Plus nor testo Smart shows ads.

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

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