# BTU Calculator vs Bluon HVAC

The clearest difference is in-app purchases: Bluon HVAC at none against BTU Calculator's 1. Bluon HVAC also leads on update cadence (monthly vs every 4 months) and ratings volume (4.5K vs 318). BTU Calculator's advantage is review sentiment (69% vs 55%) and iOS requirement (12.0 vs 15.1). On price, rating, ads and device support there is nothing between them.

Both are free to download. BTU Calculator sells 1 one-off in-app purchase. Bluon HVAC asks for nothing beyond the download.

Bluon HVAC holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Bluon HVAC has 4.5K ratings behind it against 318, so its average is the more settled of the two. Written reviews complicate that: 69% of BTU Calculator's written reviews are positive against 55% of Bluon HVAC's, so the app with the better star average is not the one people write more warmly about.

BTU Calculator ships an update every 4 months, Bluon HVAC monthly. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | BTU Calculator | Bluon HVAC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (318 ratings)](https://appshunter.io/ios/app/btu-calculator-data-centers/id685976218/reviews) | **[4.8 (4.5K ratings)](https://appshunter.io/ios/app/bluon-hvac/id1357521880/reviews)** |
| Number of ratings | 318 | **4.5K** |
| Positive reviews | **68.8% of reviews** | 54.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 23 MB | 170 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cristinel Bontas](https://appshunter.io/developer/645866051) | [Bluon, Inc.](https://appshunter.io/developer/1357521879) |

## What reviewers say

### BTU Calculator

[App page](https://appshunter.io/ios/app/btu-calculator-data-centers/id685976218)

Estimate the cooling capacity needed for your data center. This tool considers factors like space, occupants, and heat output to help you maintain optimal temperature and humidity. It provides instant results as you update inputs, serving as a guide for system selection.

**Highlights:** Estimate cooling capacity, Maintain 24°C and 30-50% humidity, Consider space, occupants, window R-value, Calculate total heat output, Instant cooling load results, Guide for system selection

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


### Bluon HVAC

[App page](https://appshunter.io/ios/app/bluon-hvac/id1357521880)

Access a vast database of HVAC models, manuals, and part lists to speed up your work. Utilize an AI-powered troubleshooting tool or connect with experienced technicians for real-time support.

**Highlights:** 500,000+ HVAC unit database, Manuals and part lists, AI troubleshooting tool (MasterMechanic), Live support from veteran techs, HVAC industry upgrade tools

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

**In-app purchases:** none

**What reviewers like**

- 🤖 Helpful tech support
- 💯 Comprehensive database of manuals and information
- 🛠️ Useful tools and calculators
- 🤝 Great customer service

**What reviewers complain about**

- 💰 Paywall for advanced features
- 🔒 Limited access without company account
- 🔍 Missing manuals for some equipment models
- 🗣️ Removal of helpful forums

**Reported bugs**

- Login/password reset issues
- Frequent crashes or loading problems

**Requested features**

- Individual technician subscription option
- More comprehensive coverage of HVAC equipment models
- Ability to access full manuals without restrictions


## Frequently asked questions

### Is BTU Calculator free?

BTU Calculator is free to download, with in-app purchases available.

### Is Bluon HVAC free?

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

### Which has better reviews, BTU Calculator or Bluon HVAC?

Bluon HVAC is rated higher. BTU Calculator averages 4.6 out of 5 from 318 ratings, while Bluon HVAC averages 4.8 from 4.5K ratings.

### Do BTU Calculator or Bluon HVAC have ads?

Both BTU Calculator and Bluon HVAC show ads.

### Which is updated more often, BTU Calculator or Bluon HVAC?

BTU Calculator ships an update every 4 months, and Bluon HVAC monthly. Most recently, BTU Calculator was updated on November 1, 2026 and Bluon HVAC 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.*