HVAC Field Tools: Calculator

10 HVAC calculators, fully offline. Use PT Chart, Airflow, and Delta T free; unlock Superheat, Subcooling, Duct Size, and 4 more with one purchase—no subscription.

Fast HVAC calculations for real field work—fully offline, with no account or ads.

HVAC Field Tools puts ten practical calculators in one clean, glove-friendly toolbox for technicians, installers, estimators, and apprentices. Check refrigerant PT, airflow, Delta T, superheat, subcooling, duct sizing, sensible capacity, and moist-air properties directly on your iPhone—even when reception disappears.

THREE HVAC TOOLS FREE • PT Chart — convert gauge pressure to saturation temperature for six common refrigerants • Airflow — estimate CFM or metric airflow from opening size and measured velocity • Delta T — calculate the return-to-supply temperature split

UNLOCK SEVEN PRO TOOLS ONCE One purchase. No subscription or recurring charge. • Superheat • Subcooling • Sensible Capacity • Required Airflow • Duct Size • Psychrometrics • Refrigerant Reference

BUILT FOR FIELD WORK • Imperial and metric units • Clear input validation and range guidance • Copy any result with one tap • Pin frequently used tools • Save calculation history on your device • Light, dark, and system appearance • Large controls and VoiceOver-friendly labels

PSYCHROMETRIC RESULTS Calculate wet-bulb temperature, dew point, enthalpy, and humidity ratio from dry-bulb temperature, relative humidity, and elevation.

ONE-TIME PRO Unlock all seven Pro calculators and extended on-device history with one purchase. Purchases are handled by Apple and can be restored from Settings.

IMPORTANT HVAC Field Tools provides engineering approximations for field reference. Always verify results against manufacturer data, calibrated instruments, refrigerant safety documentation, and applicable codes before charging, commissioning, or selecting equipment.

WHAT’S NEW — VERSION 1.0

HVAC Field Tools is ready for the field.

• 10 practical HVAC calculators • PT Chart, Airflow, and Delta T available free • One-time Pro unlock for 7 advanced tools • Offline calculations, favorites, and on-device history • Imperial and metric units • Light, dark, and system appearance • VoiceOver-friendly labels and small-screen support