HVAC Superheat & Subcooling

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.