# Superheat: HVAC Charge Calc

> Superheat: HVAC Charge Calc (iPhone/iPad app by Yoshifumi Sato.)

- Source: https://appshunter.io/ios/app/superheat-hvac-charge-calc/id6794613254 (this page in markdown: same URL + `.md`)
- Developer: [Yoshifumi Sato](https://appshunter.io/developer/6780413827)
- Category: Utilities
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 12 MB
- Languages: English, Japanese
- Released: 2026-08-05
- Data updated: 2026-08-09
- User reviews in markdown: https://appshunter.io/ios/app/superheat-hvac-charge-calc/id6794613254/reviews.md

## What is Superheat?

Superheat is a fast, accurate charging and diagnostic calculator for HVAC/R technicians.

Pick a refrigerant, enter the low-side and high-side gauge pressures and the line temperatures, and get:

- Saturation temperature (dew and bubble points)
- Superheat on the low side
- Subcooling on the high side
- Glide shown correctly for zeotropic blends

REFRIGERANTS
R-410A, R-454B, R-32, R-22, R-134a, R-404A, R-407C, R-407F, R-448A, R-449A, R-452B, R-513A, R-507A, R-290, R-600a, R-717 (ammonia), R-1234yf, R-1234ze(E), R-12.

BUILT FOR THE FIELD
- Pressure in psi, kPa, bar or MPa; gauge or absolute
- Temperature in Fahrenheit or Celsius
- Altitude compensation with adjustable atmospheric pressure
- PT chart browser with pressure to saturation-temperature lookup
- Target superheat estimate for fixed-orifice systems
- Save readings per unit and review them later
- Works fully offline. No account, no ads, no tracking

ACCURACY
Saturation pressure-temperature data is precomputed with CoolProp (Helmholtz equations of state). Zeotropic blends use separate bubble and dew curves derived from their component compositions, so glide is handled correctly.

For qualified HVAC/R technicians. Always follow the equipment and refrigerant manufacturer charging specifications.


## Version history (last 1 release)

### 1.0 — 2026-08-05

No release notes.

## More apps by Yoshifumi Sato

- [おけいこ月謝帳 教室の集金管理](https://appshunter.io/ios/app/id6787108752)
- [DualShot: Front & Back Cam](https://appshunter.io/ios/app/dualshot-front-and-back-cam/id6788761561)
- [Progressly – Body Progress](https://appshunter.io/ios/app/progressly-body-progress/id6789591055)
- [Holdly – Isometric Timer](https://appshunter.io/ios/app/holdly-isometric-timer/id6789790139)
- [かんじ1年生 小学1年の漢字ドリル](https://appshunter.io/ios/app/1-1/id6789917332)
- [かんじ3年生 小学3年の漢字ドリル](https://appshunter.io/ios/app/3-3/id6790055787)

All apps by Yoshifumi Sato: https://appshunter.io/developer/6780413827

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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 2026-08-09.*