# HVAC Toolkit vs Thermal Engineering Calc

The clearest difference is price: Thermal Engineering Calc at $2.99 against HVAC Toolkit's $23.99. Thermal Engineering Calc also leads on ratings volume (6 vs 2). HVAC Toolkit's advantage is review sentiment (73% vs 50%) and rating (5.0 vs 4.7). On ads, in-app purchases, monetization model and device support there is nothing between them.

HVAC Toolkit costs $23.99 and Thermal Engineering Calc $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HVAC Toolkit holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 73% of HVAC Toolkit's written reviews are positive against 50% of Thermal Engineering Calc's.

HVAC Toolkit ships an update every 6 months, Thermal Engineering Calc every 15 months. The most recent releases landed on September 14, 2026 and August 22, 2026 respectively.

## The numbers

| Metric | HVAC Toolkit | Thermal Engineering Calc |
| --- | --- | --- |
| Price | $23.99 | **$2.99** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hvac-toolkit/id354558963/reviews)** | [4.7 (6 ratings)](https://appshunter.io/ios/app/thermal-engineering-calc/id684142208/reviews) |
| Number of ratings | 2 | **6** |
| Positive reviews | **73.3% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 15 months |
| Monetization | Paid | Paid |
| Size | 50 MB | 3 MB |
| Requires iOS | **13.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### HVAC Toolkit

[App page](https://appshunter.io/ios/app/hvac-toolkit/id354558963)

This comprehensive toolkit offers essential HVAC calculations and tools for professionals. It combines multiple specialized applications into a single, convenient package for iPhone and iPad users.

**Highlights:** Equipment tracking and customization, Refrigerant pressure-temperature charts, Refrigerant charge calculations, Duct sizing, Cooling and heating load calculations, Psychrometric calculations, Steam tables, Pipe sizing for liquid, steam, and gas

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

**In-app purchases:** none


### Thermal Engineering Calc

[App page](https://appshunter.io/ios/app/thermal-engineering-calc/id684142208)

This app provides 44 calculators for thermal engineering parameters, along with thermodynamics tables, formulas, and definitions. It's a comprehensive tool for mechanical engineers and students needing to perform various thermal calculations.

**Highlights:** 44 thermal engineering calculators, Thermodynamics tables, Formulas and definitions, Carnot and Rankine efficiency calculators, Heat transfer calculations, Temperature conversion

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Toolkit free?

HVAC Toolkit costs $23.99, with no in-app purchases.

### Is Thermal Engineering Calc free?

Thermal Engineering Calc costs $2.99, with no in-app purchases.

### Which has better reviews, HVAC Toolkit or Thermal Engineering Calc?

HVAC Toolkit is rated higher. HVAC Toolkit averages 5.0 out of 5 from 2 ratings, while Thermal Engineering Calc averages 4.7 from 6 ratings.

### Do HVAC Toolkit or Thermal Engineering Calc have ads?

Neither HVAC Toolkit nor Thermal Engineering Calc shows ads.

### Which is updated more often, HVAC Toolkit or Thermal Engineering Calc?

HVAC Toolkit ships an update every 6 months, and Thermal Engineering Calc every 15 months. Most recently, HVAC Toolkit was updated on September 14, 2026 and Thermal Engineering Calc on August 22, 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.*