App
Superheat: HVAC Calculator
Subcool, PT Chart & Wet Bulb
Enter your gauge pressure and line temp and get the superheat or subcool, the target, and a plain verdict: add refrigerant, recover, or in range. The needle and the numbers agree, so you can read it at arm's length on the condenser pad.
The first time you open it, read the condenser's data plate: tap the refrigerant and the metering device it lists (and the target subcool for a TXV), and the check opens set up for that system.
Every result shows how it got there: saturation temperature, dew or bubble point for blends (picked automatically and labelled), the target and where it came from, so you can trust the call before you touch the charge. Works fully offline. No login, no trial clock.
FREE, NO LIMITS
• Superheat check for piston / fixed-orifice systems: target superheat from outdoor dry bulb and indoor wet bulb (CEC Title 24 table), with "weigh it in" when the table says not to charge by superheat
• Subcool check for TXV / EEV systems against the nameplate target, with TXV superheat shown as information
• P-T chart: pressure to saturation temperature and back, dew and bubble for blends
• R-410A, R-454B, R-32, R-22, R-407C, R-404A and R-134a, all free, including the A2L refrigerants
• °F with psig, or °C with kPa or bar; it remembers your last refrigerant and readings
PRO, ONE-TIME PURCHASE
• Job records: save each check to a job with the system, refrigerant, readings, target and verdict, add notes, and send a PDF or CSV to the office, the customer or the rater
• Airflow check: temperature split against the target, flagged when airflow is likely low, right after a superheat check
• Elevation correction for saturation temps on mountain jobs
Built for techs charging AC and heat pump systems in hard sun with one hand on the manifold: big numbers, one result, and your last reading is still there when you open it again.
Pro is a one-time in-app purchase, not a subscription. Pay once and keep it. It restores on any device signed in to the same Apple ID.
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