HvacGauge: PT Chart Superheat
Billin Business In-app purchases
Refrigerant PT chart, superheat & subcooling calculator. Offline, A2L ready.
- Downloads
- 3+
- on Google Play
- Price
- Free
- In-app purchases
- Updated
- Oct 27
- 2026 · v1.0.1
Screenshots
About HvacGauge: PT Chart Superheat
HvacGauge is the offline HVAC PT chart, superheat calculator and subcooling calculator for HVAC and refrigeration technicians who work where there is no signal. Read pressure-temperature data, check the charge, diagnose the system and hand the customer a commissioning PDF – all from one app, with no account and no internet.
DUAL GAUGES, REAL P-T DATA
• Refrigerant PT chart with low-side and high-side readouts for 8 refrigerants: R-410A, R-454B, R-32, R-22, R-134a, R-404A, R-407C and R-290.
• Dew and bubble curves for zeotropic blends such as R-454B and R-407C.
• Live superheat, subcooling, target superheat and airside temperature split.
• A2L and A3 safety banner on every manifold screen.
HOW A CHARGE CHECK WORKS
1. Pick the refrigerant and enter low-side and high-side pressures.
2. Add suction line and liquid line temperatures.
3. HvacGauge reads saturation temperatures from the PT chart and shows actual superheat, subcooling and target superheat.
4. The fault matrix flags likely charge or airflow problems in plain language.
DIAGNOSE THE SYSTEM, NOT JUST THE PRESSURE
• Rule-based charge and airflow fault matrix with plain-language status.
• Run-capacitor microfarad test with PASS, MARGINAL and FAILED bands.
• Line-set weigh-in in ounces per foot.
• Target subcooling and rated microfarads stored per client unit.
BILL THE VISIT ON SITE
• Refrigerant, capacitor and service-call pricing per client.
• One-page Commissioning & Diagnostic Certificate PDF.
• Send the certificate by SMS or email before you leave the driveway.
BUILT FOR THE FIELD
• 100% offline: no account, no signal, no waiting on a server.
• Light and dark themes for direct sun, attics and night calls.
• Client units with equipment, address, model and serial history.
WHO IT'S FOR
• Residential and light-commercial HVAC service techs.
• Heat pump and AC installers moving to A2L refrigerants like R-454B and R-32.
• Apprentices learning to read a manifold, superheat and subcooling.
FREE PLAN
• 3 client units.
• 1 commissioning certificate.
• All PT charts, diagnostics and line-set tools.
HVACGAUGE PRO
• Unlimited client units and diagnostic logs.
• Unlimited commissioning and warranty PDFs.
• Support continued offline development.
HvacGauge is a field calculator and documentation tool. Always verify readings against the equipment manufacturer's published P-T chart and follow EPA 608 safe refrigerant handling practices.
DUAL GAUGES, REAL P-T DATA
• Refrigerant PT chart with low-side and high-side readouts for 8 refrigerants: R-410A, R-454B, R-32, R-22, R-134a, R-404A, R-407C and R-290.
• Dew and bubble curves for zeotropic blends such as R-454B and R-407C.
• Live superheat, subcooling, target superheat and airside temperature split.
• A2L and A3 safety banner on every manifold screen.
HOW A CHARGE CHECK WORKS
1. Pick the refrigerant and enter low-side and high-side pressures.
2. Add suction line and liquid line temperatures.
3. HvacGauge reads saturation temperatures from the PT chart and shows actual superheat, subcooling and target superheat.
4. The fault matrix flags likely charge or airflow problems in plain language.
DIAGNOSE THE SYSTEM, NOT JUST THE PRESSURE
• Rule-based charge and airflow fault matrix with plain-language status.
• Run-capacitor microfarad test with PASS, MARGINAL and FAILED bands.
• Line-set weigh-in in ounces per foot.
• Target subcooling and rated microfarads stored per client unit.
BILL THE VISIT ON SITE
• Refrigerant, capacitor and service-call pricing per client.
• One-page Commissioning & Diagnostic Certificate PDF.
• Send the certificate by SMS or email before you leave the driveway.
BUILT FOR THE FIELD
• 100% offline: no account, no signal, no waiting on a server.
• Light and dark themes for direct sun, attics and night calls.
• Client units with equipment, address, model and serial history.
WHO IT'S FOR
• Residential and light-commercial HVAC service techs.
• Heat pump and AC installers moving to A2L refrigerants like R-454B and R-32.
• Apprentices learning to read a manifold, superheat and subcooling.
FREE PLAN
• 3 client units.
• 1 commissioning certificate.
• All PT charts, diagnostics and line-set tools.
HVACGAUGE PRO
• Unlimited client units and diagnostic logs.
• Unlimited commissioning and warranty PDFs.
• Support continued offline development.
HvacGauge is a field calculator and documentation tool. Always verify readings against the equipment manufacturer's published P-T chart and follow EPA 608 safe refrigerant handling practices.
What’s new
Version 1.0.1 · Updated October 27, 2026
Fixes checkout: Pro plans that are not sold in your country are no longer offered, and subscribe failures now explain the actual reason instead of a generic error. Annual and monthly plans include their free trial.