# HVAC Formulator vs PCT GO

The clearest difference is price: PCT GO at Free against HVAC Formulator's $4.99. PCT GO also leads on in-app purchases (none vs 1) and iOS requirement (15.6 vs 18.6). On update cadence, ads and device support there is nothing between them.

PCT GO is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase. PCT GO asks for nothing beyond the download.

HVAC Formulator ships an update every 2 months, PCT GO every 3 months. The most recent releases landed on October 6, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | PCT GO |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | — |
| Size | 73 MB | 65 MB |
| Requires iOS | 18.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Siemens AG](https://appshunter.io/developer/394503271) |

## 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 |


### PCT GO

[App page](https://appshunter.io/ios/app/pct-go/id1555708200)

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Formulator free?

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

### Is PCT GO free?

PCT GO is free to download, with no in-app purchases.

### Do HVAC Formulator or PCT GO have ads?

Neither HVAC Formulator nor PCT GO shows ads.

### Which is updated more often, HVAC Formulator or PCT GO?

HVAC Formulator ships an update every 2 months, and PCT GO every 3 months. Most recently, HVAC Formulator was updated on October 6, 2026 and PCT GO on September 27, 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.*