Field tools

Every calculator runs right here — the same engine as the app, instantly.

You're on Free — the charging calculators (Superheat, Subcool, Target Superheat) and the PT chart are fully usable. Unlock every tool, guided diagnostics, and the AI assistant with any paid plan.

See plans

Diagnose

Superheat

Suction pressure + line temp → superheat, with saturation temp.

Subcool

Liquid pressure + line temp → subcooling, with saturation temp.

Target superheat (fixed orifice)

Indoor wet-bulb + outdoor dry-bulb → target superheat for piston/fixed systems.

Charging assistant

Locked

Factory charge + line-set length → total charge for this line set.

Psychrometrics

Locked

Dry-bulb + wet-bulb → RH, dew point, humidity ratio, grains, enthalpy.

Evacuation (micron decay)

Locked

Standing-vacuum decay → pass / moisture / leak verdict.

Sizing

Sensible CFM

Locked

Sensible BTUh + ΔT → airflow (CFM).

Round duct sizing

Locked

CFM + friction rate → equal-friction round duct size.

Total external static pressure

Locked

Supply + return static → TESP, against the unit rating.

MCA / MOCP

Locked

Compressor RLA + fan FLA → minimum circuit ampacity & max overcurrent (NEC 440).

Run capacitor

Locked

Rated vs measured µF → good / weak / failed.

Voltage imbalance

Locked

Three-phase L1/L2/L3 → NEMA % imbalance.

Guided diagnosticsStep-by-step troubleshooting flows.Install guidesStep-by-step installs & check-off lists.LookupsRefrigerants, fault codes, PT charts.AI assistantLockedAsk about the equipment in front of you.