HVAC Math: Superheat & PT

HVAC Math is a superheat and subcooling calculator for service techs: a refrigerant charge calculator, a PT chart for refrigeration and the everyday HVAC math, offline and with no account.

CHARGE CHECK
• Superheat and subcooling against target, typed on a glove-size keypad
• Piston: target superheat from the California Title 24 table (Table RA3.2-2), from indoor wet bulb and outdoor dry bulb
• TXV / EXV: target subcooling from the data plate
• Superheat reads the dew point and subcooling the bubble point, so blends come out right
• Show the math: every step and its source, ready to show the customer

PT CHART
• 40 refrigerants from published manufacturer tables, including R-410A, R-32, R-454B, R-22, R-407C, R-404A, R-134a and R-290
• Pressure to temperature or temperature to pressure, with dew and bubble side by side
• Glide, GWP and ODP for each refrigerant

EVERYDAY MATH
• Airflow: CFM from sensible load and temperature split, and total heat from airflow and enthalpy change
• Electrical: watts and BTUH from volts and amps
• psig, kPa or bar; °F or °C

HVAC MATH PRO: ONE PURCHASE, NO SUBSCRIPTION
• Ductulator: round and rectangular duct sizing by equal friction, with velocity
• Psychrometric calculator: relative humidity, dew point and enthalpy from dry and wet bulb
• Converters: pressure, temperature, airflow and static pressure
• Jobs and history: save a check to a job, and look back through past checks

YOURS, ON YOUR PHONE
• Works fully offline. No account, no sign-up
• Your jobs and readings stay on your phone

For qualified technicians. HVAC Math does the math; it doesn't give charging procedures. Verify against the equipment manufacturer's data. Refrigerant handling requires EPA Section 608 certification (US).

Recent changes:
First release: superheat and subcooling against target, a PT chart for 40 refrigerants, airflow and electrical, and HVAC Math Pro.