# HVAC Field Tools: Calculator — Superheat, PT & Duct Sizing

> Superheat, PT & Duct Sizing (iPhone/iPad app by Compass Sercurity Pte. Ltd..)

- Source: https://appshunter.io/ios/app/hvac-field-tools-calculator/id6807820291 (this page in markdown: same URL + `.md`)
- Developer: [Compass Sercurity Pte. Ltd.](https://appshunter.io/developer/1660239749)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.6 · 2 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-09-30
- Data updated: 2026-10-05

## What is HVAC Field Tools?

Fast HVAC calculations for real field work—fully offline, with no account or ads.

HVAC Field Tools puts ten practical calculators in one clean, glove-friendly toolbox for technicians, installers, estimators, and apprentices. Check refrigerant PT, airflow, Delta T, superheat, subcooling, duct sizing, sensible capacity, and moist-air properties directly on your iPhone—even when reception disappears.

THREE HVAC TOOLS FREE
• PT Chart — convert gauge pressure to saturation temperature for six common refrigerants
• Airflow — estimate CFM or metric airflow from opening size and measured velocity
• Delta T — calculate the return-to-supply temperature split

UNLOCK SEVEN PRO TOOLS ONCE
One purchase. No subscription or recurring charge.
• Superheat
• Subcooling
• Sensible Capacity
• Required Airflow
• Duct Size
• Psychrometrics
• Refrigerant Reference

BUILT FOR FIELD WORK
• Imperial and metric units
• Clear input validation and range guidance
• Copy any result with one tap
• Pin frequently used tools
• Save calculation history on your device
• Light, dark, and system appearance
• Large controls and VoiceOver-friendly labels

PSYCHROMETRIC RESULTS
Calculate wet-bulb temperature, dew point, enthalpy, and humidity ratio from dry-bulb temperature, relative humidity, and elevation.

ONE-TIME PRO
Unlock all seven Pro calculators and extended on-device history with one purchase. Purchases are handled by Apple and can be restored from Settings.

IMPORTANT
HVAC Field Tools provides engineering approximations for field reference. Always verify results against manufacturer data, calibrated instruments, refrigerant safety documentation, and applicable codes before charging, commissioning, or selecting equipment.

WHAT’S NEW — VERSION 1.0

HVAC Field Tools is ready for the field.

• 10 practical HVAC calculators
• PT Chart, Airflow, and Delta T available free
• One-time Pro unlock for 7 advanced tools
• Offline calculations, favorites, and on-device history
• Imperial and metric units
• Light, dark, and system appearance
• VoiceOver-friendly labels and small-screen support

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HVAC Tools Pro Lifetime | $9.99 | one-time |


## Is HVAC Field Tools safe?

Not enough ratings yet to assess HVAC Field Tools.

## Is HVAC Field Tools legit?

HVAC Field Tools: Calculator appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for HVAC Field Tools is 70 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-30

No release notes.

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## More apps by Compass Sercurity Pte. Ltd.

- [CompassVPN - Fast & Unlimited](https://appshunter.io/ios/app/compassvpn-fast-and-unlimited/id1660239747)
- [ArrowFlow: Arrow Puzzle](https://appshunter.io/ios/app/arrowflow-arrow-puzzle/id6795560560)

All apps by Compass Sercurity Pte. Ltd.: https://appshunter.io/developer/1660239749

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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 2026-10-05.*