# HVAC RefCharge — Ref. subcool/superheat calcs

> HVAC refrigerant superheat and subcool charging calculator with extensive refrigerant support. (iPhone/iPad app by Carmel Software Corporation.)

- Source: https://appshunter.io/ios/app/hvac-refcharge/id577005428 (this page in markdown: same URL + `.md`)
- Developer: [Carmel Software Corporation](https://appshunter.io/developer/317970398)
- Category: Productivity, Business
- Price: $9.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 15.6 · 22 MB
- Languages: American English
- Released: 2012-11-20
- Data updated: 2026-08-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hvac-refcharge/id577005428/reviews.md

## What is HVAC RefCharge?

The HVAC RefCharge app is a refrigerant charging calculator that allows HVAC technicians to perform superheat and subcool refrigerant charge calculations on-the-fly. This app includes pressure/temperature data for over 100 refrigerants.

This is a universal app that works on both the iPhone and iPad.

This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539

The following is a list of additional features:

1. Perform superheat refrigerant charge calculations for 100+ different refrigerants. Input the indoor wet-bulb and outdoor dry-bulb temps. to get the target superheat temperature. Then, specify the suction line temperature and pressure to get the actual superheat temperature. The difference tells you whether to charge or not. Also, the app auto-assigns the dew version of azeotropic refrigerant to superheat, if applicable.

2. Perform subcool refrigerant charge calculations for 100+ different refrigerants. Input the indoor wet-bulb and outdoor dry-bulb temps. to get the target subcool temperature. Then, specify the liquid line temperature and pressure to get the actual subcool temperature. The difference tells you whether to charge or not. Also, the app auto-assigns the bubble version of azeotropic refrigerant to subcool, if applicable.

3. Use an interactive slider control to increase or decrease all values and immediately observe calculated results. Also, the slider control allows for "incremental" changes so you can ever-so-slightly change values to observe newly calculated results.

4. Specify atmospheric pressure (other than standard 14.7 psi) so that calculated pressures are adjusted for high elevations like those in Denver and elsewhere.

5. Customize input types so that you can specify manufacturer-specified target superheat/subcool or input indoor dry-bulb/indoor relative humidity in place of indoor wet-bulb temperature.

6. Take a photo and assign it to the project

7. Send an email that includes all inputs, results, and the photo with a custom message

8. Display input and result values in either English or Metric units

## Key features

- Superheat and subcool calculations
- Supports 100+ refrigerants
- Interactive slider for adjustments
- Atmospheric pressure compensation
- Customizable input types
- Project photo assignment
- Email report generation
- English/Metric unit display

## Pricing and in-app purchases

Base price: $9.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


## Chart rankings

- #182 in Top Paid · Productivity (US App Store)

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/hvac-refcharge/id577005428/reviews.md

### 3/5 — Charge / Locator

*2015-08-14*

Is there a way that you can save the charging app info to a piece of equipment in the Equipment Locator App?  I kind of thought that was the purpose of the Locator App. Is there a way to input the temp press readings into the Locator App? It would be nice if you could just save all of your inputs from the charging app over to the locator side of the app. Please let me know if this is possible.

### 2/5 — No precisely , not too good

*2015-06-11*

I bought this app to save time ,it is very easy to used but target superheat and cooling seems not so precisely. The customer support is very slow . I spent money for nothing.

### 5/5 — The best!

*2013-07-03*

User friendly and best hvac charge app I have used!

## Frequently asked questions about HVAC RefCharge

### What is HVAC RefCharge used for?

HVAC RefCharge is a specialized calculator for HVAC technicians to perform on-the-fly superheat and subcool refrigerant charge calculations. It aids in determining the correct refrigerant charge for optimal system performance.

### How many refrigerants does HVAC RefCharge support?

HVAC RefCharge supports calculations for over 100 different refrigerants, providing a comprehensive tool for various HVAC systems.

### Can HVAC RefCharge adjust for different altitudes?

Yes, HVAC RefCharge allows you to specify atmospheric pressure other than the standard 14.7 psi. This feature adjusts calculated pressures for high elevations, ensuring accuracy in locations like Denver.

### Does HVAC RefCharge offer a free trial?

The provided data indicates HVAC RefCharge is a paid application priced at $9.99. There is no mention of a free trial period in the available information.

### What devices is HVAC RefCharge compatible with?

HVAC RefCharge is a universal app designed to work on both iPhone and iPad devices. It is also supported on iPod.

### How often is HVAC RefCharge updated?

The latest version of HVAC RefCharge is 4.90, and it was last updated on January 6, 2026. This indicates a history of regular updates from the developer.

### Can I customize the input methods in HVAC RefCharge?

Yes, HVAC RefCharge allows for customization of input types. You can specify manufacturer-defined target superheat/subcool or use indoor dry-bulb/relative humidity instead of indoor wet-bulb temperature.

### Does HVAC RefCharge include advertisements?

No, HVAC RefCharge does not contain advertisements. The application is a paid product, and the provided data indicates it is ad-free.

## Version history (last 5 releases)

### 4.90 — 2026-01-06

1. Added a Share button to the iPhone and iPad versions of the app, so you can now text, email, and download reports.
2. Updated help.
3. Optimized for iOS 26.

### 4.80 — 2025-03-05

1. Optimized for iOS 18 and latest iPhones/iPads.
2. Updated help.

### 4.76 — 2024-01-18

1. Optimized for iOS 17 and iPhone 15
2. Updated help

### 4.5 — 2023-03-06

1. Optimized for iOS 16 and iPhone 14.
2. Added new low-GWP refrigerant: R-454B (Dew and Bubble)
3. Works on the MacBook M1/M2
4. Updated help

### 4.1 — 2021-11-21

Minor UI update

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## More apps by Carmel Software Corporation

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All apps by Carmel Software Corporation: https://appshunter.io/developer/317970398

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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 2026-08-07.*