# Installer App vs BTU Calculator

The clearest difference is rating: BTU Calculator at 4.6 against Installer App's 3.0. BTU Calculator also leads on ratings volume (313 vs 7) and review sentiment (69% vs 53%). Installer App's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

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

BTU Calculator holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: BTU Calculator has 313 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 53% of Installer App's written reviews are positive against 69% of BTU Calculator's.

Installer App ships an update every 5 weeks, BTU Calculator every 4 months. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Installer App | BTU Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (7 ratings)](https://appshunter.io/ios/app/installer-app/id423984641/reviews) | **[4.6 (313 ratings)](https://appshunter.io/ios/app/btu-calculator-data-centers/id685976218/reviews)** |
| Number of ratings | 7 | **313** |
| Positive reviews | 53.3% of reviews | **68.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 90 MB | 23 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [Cristinel Bontas](https://appshunter.io/developer/645866051) |

## What reviewers say

### Installer App

[App page](https://appshunter.io/ios/app/installer-app/id423984641)

This app provides HVAC professionals with a digital toolbox for everyday tasks. It offers product information, installation guides, and advanced features to streamline work, including project management and hydronic balancing tools.

**Highlights:** Radiator Presetting, Product Finder, My Projects (Cloud-based), Hydronic Balancing, Flow/Pressure Calculator, Floor Heating Tools, Burner Converter, Magnetic Tool

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Installer App free?

Installer App is free to download, with no in-app purchases.

### Is BTU Calculator free?

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

### Which has better reviews, Installer App or BTU Calculator?

BTU Calculator is rated higher. Installer App averages 3.0 out of 5 from 7 ratings, while BTU Calculator averages 4.6 from 313 ratings.

### Do Installer App or BTU Calculator have ads?

BTU Calculator shows ads; Installer App does not.

### Which is updated more often, Installer App or BTU Calculator?

Installer App ships an update every 5 weeks, and BTU Calculator every 4 months. Most recently, Installer App was updated on October 17, 2026 and BTU Calculator on October 13, 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.*