# IN HVAC Calculator vs HVAC Decoder

The clearest difference is price: IN HVAC Calculator at Free against HVAC Decoder's $9.99. IN HVAC Calculator also leads on rating (4.2 vs 4.0) and iOS requirement (12.0 vs 14.0). HVAC Decoder's advantage is chart position (#200 vs unranked). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

IN HVAC Calculator is free to download; HVAC Decoder costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

IN HVAC Calculator holds the better App Store score, 4.2 against 4.0. Both are backed by a comparable volume of ratings — 11 and 28 respectively.

IN HVAC Calculator ships an update every 6 months, HVAC Decoder every 3 months. The most recent releases landed on August 15, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | IN HVAC Calculator | HVAC Decoder |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.2 (11 ratings)](https://appshunter.io/ios/app/in-hvac-calculator/id1219008229/reviews)** | [4.0 (28 ratings)](https://appshunter.io/ios/app/hvac-decoder/id1355543096/reviews) |
| Number of ratings | 11 | **28** |
| Positive reviews | — | 68.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#200** |
| Size | 27 MB | 6 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gregory Enterprises](https://appshunter.io/developer/1157657878) | [Charles Cope](https://appshunter.io/developer/1355543095) |

## What reviewers say

### IN HVAC Calculator

[App page](https://appshunter.io/ios/app/in-hvac-calculator/id1219008229)

This app provides HVAC inspection tools and guidelines for home inspectors. It helps estimate equipment age, size, and requirements, giving inspectors confidence in their reports.

**Highlights:** Equipment circuit requirements calculator, AC tonnage estimation by model number, HVAC manufacture date lookup, Combustion air requirements guide, General HVAC reference information

**Features:** macOS Compatibility

**In-app purchases:** none


### HVAC Decoder

[App page](https://appshunter.io/ios/app/hvac-decoder/id1355543096)

**Currently charting:** #200 Top Paid · Utilities (US App Store)

Decode HVAC model and serial numbers from major brands. This utility app provides thousands of model numbers and can email search results. It supports a wide range of HVAC equipment and offers close matches for unknown numbers.

**Highlights:** Decode HVAC model numbers, Decode HVAC serial numbers, Supports major HVAC brands, Thousands of model numbers, Email search results, Close match functionality, Report missing data

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

**In-app purchases:** none


## Frequently asked questions

### Is IN HVAC Calculator free?

IN HVAC Calculator is free to download, with no in-app purchases.

### Is HVAC Decoder free?

HVAC Decoder costs $9.99, with no in-app purchases.

### Which has better reviews, IN HVAC Calculator or HVAC Decoder?

IN HVAC Calculator is rated higher. IN HVAC Calculator averages 4.2 out of 5 from 11 ratings, while HVAC Decoder averages 4.0 from 28 ratings.

### Do IN HVAC Calculator or HVAC Decoder have ads?

Neither IN HVAC Calculator nor HVAC Decoder shows ads.

### Which is updated more often, IN HVAC Calculator or HVAC Decoder?

IN HVAC Calculator ships an update every 6 months, and HVAC Decoder every 3 months. Most recently, IN HVAC Calculator was updated on August 15, 2026 and HVAC Decoder on September 21, 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.*