Punch in pressures and line temps at the unit. TechCalc works out superheat and subcooling, names the likely fault and why, and files the visit under the customer's address.
Built first for our own 8-tech shop — residential AC repair & install.
The charge math, the troubleshooting and the job record live in one place, so nobody is flipping between a PT app, a calculator and a notepad at the condenser.
Pick the refrigerant and metering device first, then enter pressures and line temps. Saturation temp, superheat and subcooling work out as you type — every result shows the numbers it used.
Faults come back ranked as Likely or Possible, each next to the readings that pointed to it and what to check first. A mixed pattern says “inconclusive” instead of guessing.
Each visit — readings, diagnosis and your notes — files under the customer's address. Next time you pull up, the last visit's numbers are right there to compare.
Everything between hooking up the gauges and closing out the visit, on the phone already in your pocket.
Suction and liquid pressure, line temps, return and supply air, wet-bulb and outdoor temp — big number fields, one screen.
Superheat and subcooling against target, plus the air-side temp drop, run through plain rules. You see the verdict and the check order.
Add your notes and what you actually found. The app's call and yours are kept side by side on the job record.
Every diagnosis comes from rule-based checks on superheat, subcooling and air temperatures — the same pattern-reading a good tech does in their head. The result screen shows which readings drove it.
| Likely fault | Superheat | Subcooling | Air ΔT |
|---|---|---|---|
| Low charge / leakLeak search before adding | High | Low | Low |
| OverchargeHead pressure up | Low | High | Normal |
| Metering / liquid-line restrictionAdding charge won't fix it | High | High | Varies |
| Low indoor airflowShown as Possible — sources differ | Low | Normal | High |
The metering device decides what charge is judged on.
Built-in targets are rule-of-thumb defaults and are labelled that way. When the data plate or charging chart says otherwise, the chart wins — enter its target and the diagnosis follows it.
It's not a field-service platform. It's one lightweight tool that does the work at the unit — and nothing else.
Still on the bench: full no-signal sync is next. For now it needs a connection to save a job — readings you type are kept on the phone until you do.
Sign up with your work email and confirm it with the code we send. Then start a job, enter the readings, and see what it says.
