Free HVAC & Refrigeration Field Tools
Quick calculators for working techs — free, no sign-up, work offline once loaded.
Refrigerant PT Chart Calculator →
Convert pressure ↔ saturation temperature for 34 refrigerants (R-410A, R-22, R-404A, R-134a and more). The basis for superheat and subcooling.
Troubleshooting Guides →
Component-by-component fault guides: causes, on-site diagnosis, repair steps and failure chains for 60+ common faults.
All your field tools in one app
R-Pro adds AI fault diagnosis, voice memo, nameplate scan and job tracking — offline, in 10 languages.
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