# HVAC vs CTC Info

The clearest difference is price: CTC Info at Free against HVAC's $4.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

CTC Info 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, CTC Info every 7 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | HVAC | CTC Info |
| --- | --- | --- |
| 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 7 months |
| Monetization | Paid | — |
| Size | 14 MB | 45 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Trond Rossvoll](https://appshunter.io/developer/571419518) | [CTC AB](https://appshunter.io/developer/939576396) |

## 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


### CTC Info

[App page](https://appshunter.io/ios/app/ctc-info/id1171226447)

**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 CTC Info free?

CTC Info is free to download, with no in-app purchases.

### Do HVAC or CTC Info have ads?

Neither HVAC nor CTC Info shows ads.

### Which is updated more often, HVAC or CTC Info?

HVAC ships an update every 5 months, and CTC Info every 7 months. Most recently, HVAC was updated on November 1, 2026 and CTC Info on November 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.*