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• Replaced the bottom banner with compact native ads that blend into Home, Favorites, and Settings. • Tab bar stays clear — ads no longer sit above navigation while you work. • Bug fixes and stability improvements.
Offline EPA 608 study + SH/SC, PT charts, Jobs & PDF field suite.
HVAC Field Toolkit is an offline field suite for residential and light-commercial HVAC techs in North America and Europe — charging math, PT lookup, psychrometrics, and EPA Section 608 study in one app, even without cell signal. Not just another superheat calculator: work rooftops and mechanical rooms with a toolkit built for EPA-minded techs who need results they can share. FREE TOOLS • Superheat and subcooling with °F/°C and psi/bar/kPa switching — TXV vs fixed-orifice paths • PT charts for common refrigerants — R-410A, R-32, R-454B, R-22, R-134a, R-448A, R-507A, R-717, R-290, and more • Zeotropic blends: bubble (liquid) and dew (vapor) so SH uses dew and SC uses bubble • Psychrometric calculator: dry bulb, wet bulb, dew point, RH, enthalpy, humidity ratio • Delta T, temperature/pressure converters, voltage drop • Refrigerant reference cards, favorites, and recent tools • One free PDF export preview to try job-site sharing PRO — ONE-TIME UNLOCK ($9.99) • EPA Section 608 study: Core / Type I / II / III practice and timed exams • Target superheat for fixed-orifice charging (generic field chart — prefer OEM when available) • Named Jobs: save and reopen field calculations • Unlimited PDF reports to share with customers or the shop • Duct sizing (equal friction / Manual D–style helpers) • Airflow and run-capacitor checkers • Remove banner ads BUILT FOR THE FIELD • Light and dark themes, readable industrial UI • Local history and favorites on device — no account for core tools • 18 languages for crews that work across regions IMPORTANT Target superheat values are a generic approximation for fixed-orifice systems. Manufacturer charging charts (Carrier, Trane, Goodman, Lennox, and others) can differ. TXV and EEV systems should be charged by subcooling per OEM instructions. PT data is field-grade for service work, not a laboratory REFPROP substitute. Download HVAC Field Toolkit — EPA study, offline PT/SH/SC, Jobs, and PDF reports in one $9.99 unlock.
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