# HVAC Formulator vs Heat Engineer

The clearest difference is review sentiment: Heat Engineer at 79% against HVAC Formulator's 9%. Heat Engineer also leads on price (Free vs $4.99) and iOS requirement (16.4 vs 18.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

Heat Engineer is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase and Heat Engineer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | Heat Engineer |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 9.1% of reviews | **78.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | **Free** |
| Size | 73 MB | 203 MB |
| Requires iOS | 18.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) |

## What reviewers say

### HVAC Formulator

[App page](https://appshunter.io/ios/app/hvac-formulator/id318898907)

This app provides HVAC professionals with over 900 essential formulas and calculations for load calculations and system design. It supports both US and Metric units, offers instant switching, and includes 23 calculator categories and over 460 unit conversions. Designed for field use, it works offline and allows users to save and share results.

**Highlights:** Over 900 formulas and calculations, US & Metric unit support, 23 calculator categories, 460+ unit conversions, 8 temperature scales, Offline functionality, Save and share results

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Pro | $3.99 | one-time |


### 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 |


## Frequently asked questions

### Is HVAC Formulator free?

HVAC Formulator costs $4.99, and also offers in-app purchases.

### Is Heat Engineer free?

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

### Do HVAC Formulator or Heat Engineer have ads?

Neither HVAC Formulator nor Heat Engineer shows ads.

### Which is updated more often, HVAC Formulator or Heat Engineer?

HVAC Formulator ships an update every 2 months, and Heat Engineer every 2 months. Most recently, HVAC Formulator was updated on October 6, 2026 and Heat Engineer on October 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.*