# Heat Engineer vs AirPro

The clearest difference is ads: Heat Engineer at none against AirPro's shown. Heat Engineer also leads on monetization model (free vs free with in-app purchases). AirPro's advantage is update cadence (every 4 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Heat Engineer sells 1 one-off in-app purchase and AirPro sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Heat Engineer ships an update every 2 months, AirPro every 4 days. The most recent releases landed on August 5, 2026 and June 2, 2026 respectively.

## The numbers

| Metric | Heat Engineer | AirPro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/airpro-btu-calculator/id6470185437/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 78.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 44 MB | 18 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [Igor Ilijovski](https://appshunter.io/developer/1492982127) |

## What reviewers say

### Heat Engineer

[App page](https://appshunter.io/ios/app/heat-engineer/id879510552)

This app assists heating engineers and surveyors in collecting property data for heating system installations. It supports heat loss reports for various technologies and includes tools for sound assessments and quick estimations. Data is automatically saved for later review and amendment.

**Highlights:** Heat loss survey for BS EN 12831, CIBSE, and MCS standards, MCS 020 sound assessment for Air Source Heat Pumps, Quick heat loss estimator tool, Automatic data saving and history for amendments, Room-by-room heat loss calculation, Photo capture for rooms and installation locations, Fuel comparisons and running cost calculations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MCS 020 PDF Report Token | $2.99 | one-time |


### AirPro

[App page](https://appshunter.io/ios/app/airpro-btu-calculator/id6470185437)

This tool helps you calculate the right size for air conditioners, heat pumps, and furnaces. It provides detailed analysis of heating and cooling costs, energy consumption, and temperature data. You can also evaluate domestic hot water needs and financial aspects like payback periods.

**Highlights:** BTU estimation for HVAC systems, Monthly heating and cooling cost calculation, Energy consumption and temperature analysis, Domestic hot water needs evaluation, Financial analysis including payback periods, Data export to CSV and PDF reports

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AirPro Premium - Monthly | $7.99 | per month |
| AirPro Premium - Annual | $29.99 | per year |


## Frequently asked questions

### Is Heat Engineer free?

Heat Engineer is free to download, with in-app purchases available.

### Is AirPro free?

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

### Do Heat Engineer or AirPro have ads?

AirPro shows ads; Heat Engineer does not.

### Which is updated more often, Heat Engineer or AirPro?

Heat Engineer ships an update every 2 months, and AirPro every 4 days. Most recently, Heat Engineer was updated on August 5, 2026 and AirPro on June 2, 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.*