Chart standing · US
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The offline HVAC charging toolkit built for the A2L era. Right number at the unit — R-410A through the new low-GWP refrigerants R-454B, R-32 and R-454C — and never a subscription. NO SUBSCRIPTION. Pay once, yours forever. No ads, no account, no Bluetooth, no signal needed. EVERY REFRIGERANT, INCLUDING A2L • PT charts for R-410A, R-22, R-454B, R-32, R-454C, R-404A, R-134a, R-407C, R-290 • Bubble AND dew columns — so glide is correct on R-454C, R-407C and every blend • Superheat reads off dew, subcooling off bubble — the way the physics actually works CHARGE IT RIGHT • Measured superheat and subcooling, glide-routed per refrigerant • Target superheat for fixed-orifice systems • Airflow / CFM (1.08 × CFM × ΔT) with the 400 CFM/ton check WORKS IN YOUR UNITS • °F / psig or °C / bar — one tap, remembered BUILT FOR THE FIELD • Big numbers readable at arm's length, gloves on • Live results — no "calculate" button • 100% offline, in any basement or parking lot EVERY NUMBER SOURCED Refrigerant data from NIST REFPROP-lineage equations of state (CoolProp), cross-checked against ASHRAE 34 and manufacturer charts — version-stamped and cited in the app. A reference aid: always confirm against the equipment's charging chart and nameplate. For service techs, installers and apprentices working the R-410A → A2L transition.
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