Why Superheat
Measure refrigerant superheat and subcooling in seconds, with built-in pressure–temperature charts for R-410A, R-32, R-22, R-134a and more. Glove-friendly keypad, works offline at the jobsite.
7 refrigerants
R-410A, R-32, R-22, R-134a, R-407C, R-404A, R-454B.
Superheat & subcooling
Dew/bubble handled correctly for zeotropic blends.
Target superheat
Fixed-orifice target from indoor WB and outdoor DB.
PT chart
Full pressure–temperature reference, psig or bar.
Glove-friendly
Big keypad and outdoor-bright theme for the roof.
Offline
No signal at the condenser? No problem.
How it works
Pick refrigerant
And your unit system (imperial / metric).
Enter pressures & temps
Suction or liquid line readings.
Read the verdict
Superheat / subcooling with charge guidance.
FAQ
Which refrigerants are included?
R-410A, R-32, R-22, R-134a, R-407C, R-404A and R-454B, with dew and bubble columns where they differ.
Does it work in metric?
Yes — bar/°C and psig/°F.
Is the math verified?
Tables and formulas are checked against published PT charts and covered by an automated test suite.
Who is it for?
HVAC technicians, students and DIYers who want honest numbers at the unit.