# HVAC Calc: Superheat & P/T — Subcooling, Delta-T, Duct, CFM

> Subcooling, Delta-T, Duct, CFM (iPhone/iPad app by Youssef Kamoun.)

- Source: https://appshunter.io/ios/app/hvac-calc-superheat-and-pt/id6782998769 (this page in markdown: same URL + `.md`)
- Developer: [Youssef Kamoun](https://appshunter.io/developer/1612260996)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-06-25
- Data updated: 2026-07-31
- User reviews in markdown: https://appshunter.io/ios/app/hvac-calc-superheat-and-pt/id6782998769/reviews.md

## What is HVAC Calc?

The HVAC technician's calculator that works where you do - on the rooftop, in the mechanical room, in the dead zone.

HVAC Tech is a fast, no-nonsense field calculator for technicians, installers, estimators, and apprentices. Six pro calculators, grounded in published refrigerant data and standard field methods, all running 100% on your phone. No account. No login. No internet. Just answers.

FULLY OFFLINE - ALWAYS
Rooftops, crawlspaces, new construction with no service - HVAC Tech needs zero signal. Every P/T table, every formula, every result is computed on-device. Your data never leaves your phone because there's nothing to send.

SIX PRO CALCULATORS
- Superheat: target (fixed-orifice charging chart or TXV range) vs. actual, with a charge read and the saturation temperature.
- Subcooling: target vs. actual, with a charge read.
- Refrigerant P/T Chart: pressure to saturation temperature, with separate bubble and dew points for glide blends.
- Delta-T: supply/return temperature split vs. a humidity-based target range, with typical-cause guidance.
- Duct Sizing: CFM to round or rectangular duct size and air velocity.
- Airflow & Tonnage: CFM to tons and back (400 CFM/ton, adjustable) plus fan-law RPM changes (CFM, static, and BHP).

FREE FOREVER
All six calculators, unlimited use, on R-410A and R-22 - no trial, no ads, no sign-in. Plus up to three saved jobs.

ONE-TIME PRO. NO SUBSCRIPTION. EVER.
Unlock HVAC Tech Pro once for $9.99 and keep it:
- Every refrigerant: R-454B, R-32, R-134a, R-404A and R-407C - the A2L blends shipping in new equipment and the commercial ones - across superheat, subcooling and the P/T chart.
- Glide-aware readings: separate bubble and dew points on every blend.
- Unlimited saved jobs.
- PDF and share export.
One payment, handled by Apple. No monthly fee, no renewal.

SAVE THE JOB
Tag any reading as a saved job - unit, call, and the numbers - one tap away.

HVAC Tech is an estimation aid and is not a substitute for proper diagnostic procedures. Always verify results against the manufacturer's charging charts and target values.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HVAC Tech Pro | $9.99 | one-time |



## Version history (last 3 releases)

### 1.2.0 — 2026-07-29

Thanks for using HVAC Tech! This update:
• Makes HVAC Tech Pro easier to understand — clearer, in-context info on what unlocking adds: every refrigerant (R-454B, R-32 and the commercial blends), unlimited saved jobs, and PDF / share export.
• Fixes a bug where the unlock button could do nothing if the App Store was slow to load. Purchases now retry automatically and report any error.
• Reliability improvements and polish.

### 1.1.0 — 2026-07-26

Clearer free and Pro split.

All six calculators stay free, forever, on R-410A and R-22 - no trial, no ads, no sign-in.

The A2L blends shipping in new equipment and the commercial ones - R-454B, R-32, R-134a, R-404A and R-407C - are now part of the one-time HVAC Tech Pro unlock, along with unlimited saved jobs and PDF export. Locked refrigerants stay visible in the picker so you can see exactly what Pro adds before you pay.

### 1.0 — 2026-06-25

No release notes.

## More apps by Youssef Kamoun

- [Tripwalt: Smart Trip Planner](https://appshunter.io/ios/app/tripwalt-smart-trip-planner/id6741561785)
- [OxyRemote: Oxygen Monitor](https://appshunter.io/ios/app/oxyremote-oxygen-monitor/id6766105589)
- [Holdover: Ballistic Calculator](https://appshunter.io/ios/app/holdover-ballistic-calculator/id6778930018)
- [Lexicon — Daily Word Puzzle](https://appshunter.io/ios/app/lexicon-daily-word-puzzle/id6779067777)
- [GRAZE: Neon Reflex Dodge](https://appshunter.io/ios/app/graze-neon-reflex-dodge/id6779954510)
- [NEC Electrician Calc: VoltKit](https://appshunter.io/ios/app/nec-electrician-calc-voltkit/id6782881081)

All apps by Youssef Kamoun: https://appshunter.io/developer/1612260996

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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 2026-07-31.*