HVAC Tools PT Chart - Gauge
Superheat, PT Chart & Service
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Now with AI HVAC Advisor - describe symptoms, get expert diagnostic guidance powered by Grok AI.
Gauge is the field reference app built for HVAC technicians. Every tool you reach for on the job - pressure-temperature charts, superheat and subcooling calculators, airflow, duct sizing, Ohm's Law, capacitor check, voltage drop - in one fast, glove-friendly interface.
-- CALCULATORS --
Superheat Calculator
Enter suction pressure and suction line temperature. Gauge looks up saturation temperature from the PT chart and calculates actual superheat instantly.
Subcooling Calculator
Enter liquid line pressure and liquid line temperature for accurate subcooling on any common refrigerant.
Temperature Split Calculator
Supply and return air temps. Actual vs target split shown side by side.
Airflow / CFM Calculator (Pro)
Duct dimensions and velocity to CFM conversion. Essential for commissioning and balancing.
Duct Sizing Calculator (Pro)
Diameter and velocity from CFM and friction rate. Design or diagnose duct systems fast.
Ohm's Law Calculator
Solve for voltage, current, resistance, or power. Enter any two values.
Capacitor Check Calculator (Pro)
Rated vs measured microfarads with pass/fail result and tolerance band.
Voltage Drop Calculator (Pro)
Wire length, gauge, load current, and system voltage to determine voltage drop percentage.
-- PRESSURE-TEMPERATURE CHART --
Full PT chart for R-410A, R-22, R-134a, R-407C, R-404A, R-32, R-454B, R-290, R-438A, R-422D and more. Enter a pressure or temperature and the matching value highlights instantly in the table. Free tier includes R-410A and R-22.
-- AI HVAC ADVISOR (Pro) --
Describe your symptoms - high head pressure, low suction, ice on the coil, unit running but not cooling - and get expert diagnostic guidance from Grok AI. Responses are concise, field-applicable, and reference specific pressures and temperatures. This is not a chatbot - it's a diagnostic partner.
-- SERVICE CALL LOG --
Log every job. Refrigerant type, system make and model, complaint, pressures, temperatures, amp readings, diagnosis, parts, notes. Full job history searchable by date or system. Free tier includes up to 10 service calls.
-- REFERENCE LIBRARY --
Troubleshooting guides for AC systems, gas furnaces, and heat pumps - step-by-step diagnostic checks organized by symptom. Refrigerant quick-reference with GWP, flammability rating, and phase-down status. System type overviews. Copper wire ampacity table. EPA 608 certification reference.
-- DESIGNED FOR THE FIELD --
Large tap targets for gloved hands. High-contrast white interface readable in direct sunlight. Monospaced numbers so PT chart columns align perfectly. All calculators work offline - no internet required for PT charts, superheat, subcooling, or any local calculator.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Karol Jaworski, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Karol Jaworski
- Size
- 1.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 18 or later.
- iPhone
Requires iOS 18 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Gauge Pro $4.99
- Gauge Pro $39.99
- Gauge Pro $39.99
- Copyright
- © 2026 Karol Jaworski