# HVAC Superheat Subcooling Calc — R-454B Refrigerant PT Chart

> R-454B Refrigerant PT Chart (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/hvac-superheat-subcooling-calc/id6761745516 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-04-07
- Data updated: 2026-08-01
- User reviews in markdown: https://appshunter.io/ios/app/hvac-superheat-subcooling-calc/id6761745516/reviews.md

## What is HVAC Superheat Subcooling Calc?

On a service call and need to check superheat and subcooling without flipping through PT charts? Select your refrigerant (R-410A, R-22, R-134a, or R-404A), enter suction and liquid line pressures and temperatures, and get instant color-coded readings: green for normal, yellow for marginal, red for out of range.

WHAT IT CALCULATES:
- Superheat (suction line temperature minus saturation temperature)
- Subcooling (saturation temperature minus liquid line temperature)
- Saturation temperatures from built-in pressure-temperature charts

REFRIGERANTS SUPPORTED:
- R-410A
- R-22
- R-134a
- R-404A

KEY FEATURES:
- Built-in PT charts for all four refrigerants
- Color-coded status indicators for quick diagnosis
- Target range reference (10-15 F for both superheat and subcooling)
- Instant results as you adjust inputs
- Works completely offline
- No account or login required

Built for HVAC technicians, refrigeration mechanics, and service professionals who need fast, reliable superheat and subcooling checks during system diagnostics and charging.


## Version history (last 4 releases)

### 1.0.3 — 2026-07-01

Added R-32 and R-454B (A2L) with correct bubble/dew superheat & subcooling, plus higher-accuracy PT curves.

### 1.0.2 — 2026-06-28

Added a More Pro Tools section to discover related field calculators.

### 1.0.1 — 2026-04-12

Bug fixes and performance improvements.

### 1.0 — 2026-04-08

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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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 2026-08-01.*