# HVAC vs Interaxo Field

The clearest difference is price: Interaxo Field at Free against HVAC's $4.99. Interaxo Field also leads on update cadence (every 3 weeks vs every 5 months) and iOS requirement (14.2 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Interaxo Field is free to download; HVAC costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HVAC ships an update every 5 months, Interaxo Field every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | HVAC | Interaxo Field |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/hvac-calculator/id602391404/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 14 MB | 100 MB |
| Requires iOS | 16.0 | **14.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trond Rossvoll](https://appshunter.io/developer/571419518) | [Tribia AS](https://appshunter.io/developer/735180484) |

## What reviewers say

### HVAC

[App page](https://appshunter.io/ios/app/hvac-calculator/id602391404)

This app provides quick and easy calculations for HVAC professionals and enthusiasts. It simplifies complex formulas for energy use, airflow, and duct dimensions, making them accessible on your iPhone or iPad.

**Highlights:** SFP calculations, Heat recovery efficiency, Air velocity in ducts, Duct dimensioning, Pressure drop calculations, Equivalent diameters

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

**In-app purchases:** none


### Interaxo Field

[App page](https://appshunter.io/ios/app/interaxo-field/id1462735139)

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC free?

HVAC costs $4.99, with no in-app purchases.

### Is Interaxo Field free?

Interaxo Field is free to download, with no in-app purchases.

### Do HVAC or Interaxo Field have ads?

Neither HVAC nor Interaxo Field shows ads.

### Which is updated more often, HVAC or Interaxo Field?

HVAC ships an update every 5 months, and Interaxo Field every 3 weeks. Most recently, HVAC was updated on November 1, 2026 and Interaxo Field on November 3, 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.*