# HVAC Superheat & Subcooling — PT Chart and Charge Verdicts

> PT Chart and Charge Verdicts (iPhone/iPad app by 光 杨.)

- Source: https://appshunter.io/ios/app/hvac-superheat-and-subcooling/id6780412767 (this page in markdown: same URL + `.md`)
- Developer: [光 杨](https://appshunter.io/developer/1891134953)
- Category: Utilities, Reference
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-06-27
- Data updated: 2026-09-24
- User reviews in markdown: https://appshunter.io/ios/app/hvac-superheat-and-subcooling/id6780412767/reviews.md

## What is HVAC Superheat & Subcooling?

HVAC Charge Check is an offline field calculator for service techs who need a fast refrigerant charge verdict on a live call.

Use it for:

• Superheat checks on fixed-orifice, piston, and cap-tube systems
• Subcooling checks on TXV and EEV systems
• Common refrigerants including R-410A, R-22, R-32, R-454B, R-407C, and R-134a
• Pressure-temperature reference for R-410A, R-22, R-32, R-454B, R-407C, and R-134a
• Clear Add, Hold, or Recover verdicts from field readings
• Save local service cards with unit, visit, date, readings, verdict, and optional technician note
• Compare a later card with the previous matching visit using descriptive reading changes
• Copy a complete service note for your own field records

Why techs keep it on the truck:

• Opens straight to the charge workflow
• No account, no ads, no subscription, and no bulky HVAC suite
• Works offline in attics, basements, rooftops, and mechanical rooms
• Keeps readings and service cards on the device

HVAC Charge Check is a field utility, not a replacement for manufacturer charging procedures. Stabilize airflow and load, then follow equipment documentation when available.


## Version history (last 3 releases)

### 1.0.2 — 2026-09-17

Save service readings in named service cards, keep initial and follow-up visits together, compare recorded changes, and copy a complete service note. Comparisons are descriptive and do not diagnose a fault or approve a charge.

### 1.0.1 — 2026-07-07

Updated the App Store listing to better reflect the app's offline PT chart and field verdict workflow.

### 1.0 — 2026-06-17

No release notes.

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## More apps by 光 杨

- [ConcretePour Pro](https://appshunter.io/ios/app/concretepour-pro/id6761770433)
- [Roofing Cost Estimator](https://appshunter.io/ios/app/roofing-cost-estimator/id6761807843)
- [Cut Optimizer Pocket](https://appshunter.io/ios/app/cut-optimizer-pocket/id6761807889)
- [KitchenBatch Pro](https://appshunter.io/ios/app/kitchenbatch-pro/id6761807896)
- [Tile Layout Pocket](https://appshunter.io/ios/app/tile-layout-pocket/id6761807981)
- [TipSmart Splitter](https://appshunter.io/ios/app/tipsmart-splitter/id6761808040)

All apps by 光 杨: https://appshunter.io/developer/1891134953

## Related topics

[hvac charge](https://appshunter.io/ios/topics/hvac-charge) · [checking charge](https://appshunter.io/ios/topics/checking-charge) · [subcooling](https://appshunter.io/ios/topics/subcooling)

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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 2026-09-24.*