# HVAC Formulator vs HVAC Toolkit Ultimate

The clearest difference is price: HVAC Formulator at $4.99 against HVAC Toolkit Ultimate's $59.99. HVAC Formulator also leads on update cadence (every 2 months vs every 6 months) and chart position (#197 vs unranked). HVAC Toolkit Ultimate's advantage is rating (3.0 vs 2.0) and in-app purchases (none vs 1). On ads, monetization model and device support there is nothing between them.

HVAC Formulator costs $4.99 and HVAC Toolkit Ultimate $59.99 up front. HVAC Formulator sells 1 one-off in-app purchase. HVAC Toolkit Ultimate asks for nothing beyond the download.

HVAC Toolkit Ultimate holds the better App Store score, 3.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively. Written reviews point the same way: 9% of HVAC Formulator's written reviews are positive against 40% of HVAC Toolkit Ultimate's.

HVAC Formulator ships an update every 2 months, HVAC Toolkit Ultimate every 6 months. The most recent releases landed on September 5, 2026 and August 27, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | HVAC Toolkit Ultimate |
| --- | --- | --- |
| Price | **$4.99** | $59.99 |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews) | **[3.0 (4 ratings)](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247/reviews)** |
| Number of ratings | 1 | **4** |
| Positive reviews | 9.1% of reviews | **40.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Paid | Paid |
| Best chart rank | **#197** | — |
| Size | 73 MB | 59 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Carmel Software Corporation](https://appshunter.io/developer/317970398) |

## What reviewers say

### HVAC Formulator

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

**Currently charting:** #197 Top Paid · Productivity (US App Store)

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 |


### HVAC Toolkit Ultimate

[App page](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247)

This comprehensive application offers a suite of tools for HVAC professionals, including load calculations, equipment tracking, refrigerant charts, duct and pipe sizing, and psychrometric analysis. It consolidates multiple functionalities into a single, powerful utility for field and office use.

**Highlights:** Residential load calculations, Equipment nameplate data tracking, Refrigerant pressure-temperature charts, Superheat and subcool calculations, Duct and pipe sizing analysis, Psychrometric calculations, Steam table property calculations

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Formulator free?

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

### Is HVAC Toolkit Ultimate free?

HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.

### Which has better reviews, HVAC Formulator or HVAC Toolkit Ultimate?

HVAC Toolkit Ultimate is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while HVAC Toolkit Ultimate averages 3.0 from 4 ratings.

### Do HVAC Formulator or HVAC Toolkit Ultimate have ads?

Neither HVAC Formulator nor HVAC Toolkit Ultimate shows ads.

### Which is updated more often, HVAC Formulator or HVAC Toolkit Ultimate?

HVAC Formulator ships an update every 2 months, and HVAC Toolkit Ultimate every 6 months. Most recently, HVAC Formulator was updated on September 5, 2026 and HVAC Toolkit Ultimate on August 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.*