# SuperCool Slide Rule HVAC

> HVAC diagnostic and calculation tool for technicians. (iPhone/iPad app by Designstein, llc.)

- Source: https://appshunter.io/ios/app/supercool-slide-rule-hvac/id1193020259 (this page in markdown: same URL + `.md`)
- Developer: [Designstein, llc](https://appshunter.io/developer/1193020258)
- Category: Utilities
- Price: Free
- Rating: 4.20/5 from 185 App Store ratings · 56 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 38 MB
- Languages: American English
- Released: 2017-01-26
- Data updated: 2026-08-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/supercool-slide-rule-hvac/id1193020259/reviews.md

## What is SuperCool Slide Rule HVAC?

The SuperCool HVAC app provides comprehensive solutions to the most complex problems in the industry. The app provides the user with an interactive experience, possible solutions, on-screen instructions and guides the technician through each step of repair work. 
Included in the app is:
Superheat & Subcooling charging of all the popular refrigerants on the market with on screen corrective action including “add refrigerant” or “remove refrigerant” based on the specific conditions entered
Duct sizing & layout calculator for flex, round metal, rectangular and oval
Compressor windings troubleshooter with “acceptable resistance” or “unacceptable resistance”
Conversions for everything HVAC
Capacitor series and parallel installation output values
Airflow troubleshooting for both heating & cooling with acceptable airflow ranges and solutions if airflow is too high or too low
Wet Bulb calculator
Belt Sizing calculator
And much, much more

## Key features

- Superheat & Subcooling charging
- Duct sizing & layout calculator
- Compressor windings troubleshooter
- HVAC conversions
- Capacitor calculations
- Airflow troubleshooting

## What do users think of SuperCool Slide Rule HVAC?

Overall sentiment: mixed

**Pros**

- 👍 Great HVAC tool
- 👍 Informative slide rule
- 👍 Helpful for new techs
- 👍 Quick and simple
- 👍 Easy to use
- 👍 All in one app
- 👍 Invaluable in the field
- 👍 Pocket reference
- 👍 Good for duct sizing
- 👍 Helps customers understand issues

**Cons**

- 🐛 Trial period issues
- 🐛 App expires frequently
- 🐛 Requires re-download
- 🐛 Not worth the trouble
- 🐛 App messed up
- 🐛 Scrambled charts
- 🐛 Junk app
- 🐛 Paid version still has issues
- 🐛 Free not free
- 🐛 No cost upfront
- 🐛 No way to purchase
- 🐛 Closes itself
- 🐛 No portrait mode
- 🐛 No friction rate selection
- 🐛 No quick duct sizing
- 🐛 Inaccurate altitude
- 🐛 Room calc issues

**Commonly reported bugs**

- App expires and stops working
- Requires constant uninstall/reinstall
- App is scrambled and unusable
- Superheat and subcooling chart scrambled
- Paid version still prompts for payment/trial expired
- App continuously closes itself
- No setting for altitude
- Room calculator gives same results for different room sizes

**Most requested features**

- Update with R454B
- Update with R32
- Add R421a refrigerant
- Add R427a refrigerant
- Add R744/R290/R1270 refrigerants
- Add portrait mode
- Allow friction rate selection
- Quick duct sizing option
- Convert F to C
- Convert Psi to Bar
- Update for newer iOS
- Add ability to buy app

## Recent user reviews (10 of 56)

All indexed reviews: https://appshunter.io/ios/app/supercool-slide-rule-hvac/id1193020259/reviews.md

### 5/5 — R454B?

*2026-06-10, version 1.0*

Best app there is but any chance of an update with R454B?

### 1/5 — Trial period!? Don’t bother!!!

*2026-05-28, version 1.0*

The app expires at the worst time and will not work until you delete the app and re download it. This is the third time the app expires when I’m at a site with no internet and no cell service. What am I supposed to do? I’ve complained about this before, I think they use this underhanded tactic to artificially inflate their app download count. PLEASE STOP IT!
ZERO STARS!!!!

### 3/5 — HVAC

*2026-04-02, version 1.0*

App does not have r32 or r454b. They need to update

### 4/5 — When yall will add the r32 and r454b refrigerants?

*2026-01-31, version 1.0*

👍

### 1/5 — Doesn’t work

*2025-07-23, version 1.0*

Every time you try and open it, says to delete and redownload. Doesn’t have new 454 or 32 refrigerant yet.

### 5/5 — Amazing app!

*2025-06-28, version 1.0*

I really hope the developer updates this app with the new refrigerants that are now out. This is an awesome app!

### 5/5 — Everything you in the palm of your hand.

*2025-03-18, version 1.0*

Tried others but I keep coming back.

### 5/5 — Amazing app

*2025-02-26, version 1.0*

I hope work ASAP

### 5/5 — Great HVAC Tool

*2024-10-28, version 1.0*

I absolutely love this app if your a manager have your less experienced guys download this you can help them solve almost any issue.
 If you have estimators for replacement great tool for duct sizing and checking, also helps customers understand what is wrong with their existing duct systems.

### 1/5 — Not worth the trouble

*2024-10-04, version 1.0*

It would be a good app if it didn’t pull “Trial Period Expired” after each use forcing the deletion and downloading just to get the numbers up.  Don’t waste your time.  Plenty of other apps have the same functionality

## Frequently asked questions about SuperCool Slide Rule HVAC

### What does the SuperCool Slide Rule HVAC app do?

This app provides HVAC technicians with a comprehensive set of tools for diagnosing and solving complex HVAC problems. It offers interactive guides, on-screen instructions, and step-by-step repair assistance for various tasks.

### What are the key features of this HVAC app?

Key features include superheat and subcooling charging calculations for popular refrigerants with corrective actions, duct sizing and layout calculators for different duct types, a compressor windings troubleshooter, and various HVAC conversion tools.

### Is this app free to use?

Yes, based on the provided information, this app is available for free. There are no mentions of in-app purchases or advertisements.

### Who is the target audience for this app?

The app is intended for HVAC technicians and industry professionals who require on-the-go access to diagnostic tools, repair guides, and complex calculations to perform their jobs efficiently.

### What kind of calculations can I perform with this app?

You can perform critical HVAC calculations such as superheat and subcooling, duct sizing for flex, round metal, rectangular, and oval ducts, capacitor series and parallel installation output values, and wet bulb calculations.

## Version history (last 1 release)

### 1.0 — 2017-01-26

This app has been updated by Apple to display the Apple Watch app icon.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-04.*