HVAC Superheat & Subcooling

Offline HVAC charge verdicts plus saved service cards, visit history, and recorded comparisons for field notes.

HVAC Charge Check is an offline field calculator for service techs who need a fast refrigerant charge verdict on a live call.

Use it for:

• Superheat checks on fixed-orifice, piston, and cap-tube systems • Subcooling checks on TXV and EEV systems • Common refrigerants including R-410A, R-22, R-32, R-454B, R-407C, and R-134a • Pressure-temperature reference for R-410A, R-22, R-32, R-454B, R-407C, and R-134a • Clear Add, Hold, or Recover verdicts from field readings • Save local service cards with unit, visit, date, readings, verdict, and optional technician note • Compare a later card with the previous matching visit using descriptive reading changes • Copy a complete service note for your own field records

Why techs keep it on the truck:

• Opens straight to the charge workflow • No account, no ads, no subscription, and no bulky HVAC suite • Works offline in attics, basements, rooftops, and mechanical rooms • Keeps readings and service cards on the device

HVAC Charge Check is a field utility, not a replacement for manufacturer charging procedures. Stabilize airflow and load, then follow equipment documentation when available.