# Airkit: HVAC Calculator — Charging, ductulator, PT chart

> Charging, ductulator, PT chart (iPhone/iPad app by Chirag Arora.)

- Source: https://appshunter.io/ios/app/airkit-hvac-calculator/id6789883984 (this page in markdown: same URL + `.md`)
- Developer: [Chirag Arora](https://appshunter.io/developer/1892433885)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 49 MB
- Languages: American English
- Released: 2026-07-16
- Data updated: 2026-07-20
- User reviews in markdown: https://appshunter.io/ios/app/airkit-hvac-calculator/id6789883984/reviews.md

## What is Airkit?

Airkit is the all-in-one HVAC calculator built for working technicians. Superheat and subcooling, refrigerant charging, the ductulator, PT charts, airflow, static pressure, and the electrical numbers — every calc you reach for on a service call, in one fast, offline app.

Built for modern systems. Airkit handles A2L refrigerants (R-454B, R-32, R-454C) with glide done right — dew point for superheat, bubble point for subcooling — alongside R-410A, R-22, R-134a and 15+ more.

CHARGING
• Superheat & subcooling with live verdicts against your target
• Target superheat from indoor wet bulb + outdoor dry bulb (fixed orifice / piston)
• Delta T health check
• Charging assistant — pass, add, or recover refrigerant

REFRIGERANT
• PT chart — a pressure-temperature slider for 20+ refrigerants
• Line set charge — ounces per foot for the actual run
• A2L handling, oil pairing, and cylinder-color reference

AIRFLOW
• Ductulator — round & rectangular duct sizing by friction rate or velocity
• CFM per ton and target airflow
• Static pressure designer — TESP, filter and coil drops, friction rate

ELECTRICAL
• MCA / MOCP with copper wire sizing (NEC 2023)
• Capacitor check — rated vs. measured, plus under-load microfarads
• Ohm's Law and AC power

PLUS
• Unit converter — pressure, vacuum microns, temperature, airflow, capacity, length and more
• Offline reference: thermostat wiring, superheat/subcooling targets, duct velocity, line sets, ACR copper tube, refrigerant & oil pairing

WHY AIRKIT
• Works fully offline — no signal in the mechanical room, no problem
• No account, no sign-up
• Fast, glove-friendly, and readable in the dark or in glare
• Values consistent with NEC 2023 and ASTM B280 — always verify against the locally adopted code
• Full English and Spanish support

Free to use, with an optional Pro unlock for the complete refrigerant set and advanced tools.

Airkit is an informational aid for trained HVAC/R professionals. Always follow equipment nameplates, OEM literature, and local code.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Airkit Pro - Monthly | $4.99 | per month |
| Airkit Pro - Yearly | $19.99 | per year |



## Version history (last 1 release)

### 1.0.0 — 2026-07-16

No release notes.

## More apps by Chirag Arora

- [Nova Counter - Tally & Track](https://appshunter.io/ios/app/nova-counter-tally-and-track/id6762009096)
- [Flashly - Morse & Strobe Light](https://appshunter.io/ios/app/flashly-morse-and-strobe-light/id6762087881)
- [GoSober: Sobriety Tracker](https://appshunter.io/ios/app/gosober-sobriety-tracker/id6763368422)
- [Biology AI - Science Answers](https://appshunter.io/ios/app/biology-ai-science-answers/id6767867577)
- [Caloreo: Snap & Log Calories](https://appshunter.io/ios/app/caloreo-snap-and-log-calories/id6780207048)
- [Voltkit: NEC Conduit Fill Calc](https://appshunter.io/ios/app/voltkit-nec-conduit-fill-calc/id6783893946)

All apps by Chirag Arora: https://appshunter.io/developer/1892433885

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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 2026-07-20.*