# CoolCloud HVAC 2.0 vs Klein Borescope ET21

The clearest difference is rating: CoolCloud HVAC 2.0 at 2.7 against Klein Borescope ET21's 2.2. Klein Borescope ET21's advantage is update cadence (every 2 months vs every 18 months) and iOS requirement (12.0 vs 15.1). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CoolCloud HVAC 2.0 holds the better App Store score, 2.7 against 2.2. Both are backed by a comparable volume of ratings — 20 and 9 respectively.

CoolCloud HVAC 2.0 ships an update every 18 months, Klein Borescope ET21 every 2 months. Both last shipped on October 21, 2026.

## The numbers

| Metric | CoolCloud HVAC 2.0 | Klein Borescope ET21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (20 ratings)](https://appshunter.io/ios/app/coolcloud-hvac-20/id6463789952/reviews)** | [2.2 (9 ratings)](https://appshunter.io/ios/app/klein-borescope-et21/id6740300461/reviews) |
| Number of ratings | **20** | 9 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 29 MB | 19 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Goodman Manufacturing Company, L.P.](https://appshunter.io/developer/1269645920) | [Klein Tools](https://appshunter.io/developer/440692921) |

## What reviewers say

### CoolCloud HVAC 2.0

[App page](https://appshunter.io/ios/app/coolcloud-hvac-20/id6463789952)

This application enables HVAC contractors to wirelessly connect with Goodman and Amana air handler and furnace control boards via Bluetooth. It streamlines equipment servicing, maintenance, configuration, and diagnostics for improved energy efficiency and performance.

**Highlights:** Bluetooth connectivity, Equipment configuration, Status monitoring, Diagnostic tools, Fault code history, Energy efficiency optimization

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

**In-app purchases:** none


### Klein Borescope ET21

[App page](https://appshunter.io/ios/app/klein-borescope-et21/id6740300461)

This app allows construction workers to capture pictures and videos of worksite progress and details using a WiFi borescope. It facilitates easy documentation of on-site conditions and project advancements.

**Highlights:** Picture capture, Video recording, WiFi connectivity, Worksite documentation, Progress tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CoolCloud HVAC 2.0 free?

CoolCloud HVAC 2.0 is free to download, with no in-app purchases.

### Is Klein Borescope ET21 free?

Klein Borescope ET21 is free to download, with no in-app purchases.

### Which has better reviews, CoolCloud HVAC 2.0 or Klein Borescope ET21?

CoolCloud HVAC 2.0 is rated higher. CoolCloud HVAC 2.0 averages 2.7 out of 5 from 20 ratings, while Klein Borescope ET21 averages 2.2 from 9 ratings.

### Do CoolCloud HVAC 2.0 or Klein Borescope ET21 have ads?

Neither CoolCloud HVAC 2.0 nor Klein Borescope ET21 shows ads.

### Which is updated more often, CoolCloud HVAC 2.0 or Klein Borescope ET21?

CoolCloud HVAC 2.0 ships an update every 18 months, and Klein Borescope ET21 every 2 months. Most recently, CoolCloud HVAC 2.0 was updated on October 21, 2026 and Klein Borescope ET21 on October 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.*