# CR-Tech: HVAC Field Toolkit — Superheat, PT Charts, Manuals

> Superheat, PT Charts, Manuals (iPhone/iPad app by Ceasar Esquivel.)

- Source: https://appshunter.io/ios/app/cr-tech-hvac-field-toolkit/id6799841891 (this page in markdown: same URL + `.md`)
- Developer: [Ceasar Esquivel](https://appshunter.io/developer/1894158190)
- Category: Utilities, Reference
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 114 MB
- Languages: American English
- Released: 2026-08-25
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/cr-tech-hvac-field-toolkit/id6799841891/reviews.md

## What is CR?

CR-Tech is an offline toolkit for HVAC technicians who service Carrier rental chillers and rooftop units. Basements, mech rooms, anywhere the bars drop out.

No account required. Tap "Start Using CR-Tech" on the welcome screen and everything below is available immediately, no setup.

NINE CALCULATORS BUILT FOR THE TRUCK
Type your readings in, get your number:
- Superheat: fixed-orifice and TXV
- Subcooling
- PT Chart: bubble/dew columns for blends, plus R-1233zd(E) and R-514A for low-pressure and vacuum work. 11 refrigerants.
- Tonnage
- Airflow
- Electrical load: sizes off motor starting current, not just running load
- Nitrogen test
- Pipe sizing
- TXV sizing

Every calculator takes typed pressures and temperatures. No Bluetooth gauges or extra hardware needed.

OFFLINE MANUAL LIBRARY
25 Carrier rental equipment service manuals are bundled directly into the app and open in airplane mode. Search runs on-device across all 52 manuals. Pull a fault code or a wiring diagram with no bars.

READABLE WITH GLOVES ON
Big type, big tap targets, color-coded results. Built to be read at arm's length in bad light.

CR-Tech is an independent tool and is not affiliated with, endorsed by, or sponsored by Carrier Global Corporation. Carrier service documentation is included under written permission held by the developer.


## Version history (last 1 release)

### 1.0.0 — 2026-08-25

No release notes.

## More apps by Ceasar Esquivel

- [Lumina Deck](https://appshunter.io/ios/app/lumina-deck/id6762442797)
- [GirlMath: Budgeting for Queens](https://appshunter.io/ios/app/girlmath-budgeting-for-queens/id6762488738)
- [Lumina Kids Rewards](https://appshunter.io/ios/app/lumina-kids-rewards/id6763493547)

All apps by Ceasar Esquivel: https://appshunter.io/developer/1894158190

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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 2026-08-27.*