HVAC Load Duct Calc

HVAC Load Duct Calc is the all-in-one toolkit for licensed HVAC technicians and engineers. Designed for field professionals who need fast, accurate calculations without internet access. KEY FEATURES: 1. BTU Heat Load Calculator - Calculate heating and cooling loads for any room - Input room dimensions, insulation type, and temperature difference - Automatic BTU-to-ton conversion - Supports both heating and cooling scenarios 2. Duct Size Calculator - Convert CFM to round duct diameter - Get recommended maximum velocity by system type (residential, commercial, industrial) - Round-to-rectangular duct conversion - Calculate actual air velocity and equivalent diameter 3. Refrigerant Reference Data - 8 common refrigerants including R-410A, R-32, R-134a, R-22, R-404A, R-407C, R-290, and R-454B - Properties: boiling point, critical temperature and pressure - ODP and GWP environmental data - Safety classification for each refrigerant 4. Psychrometric Calculator - Input dry bulb temperature and relative humidity - Calculate dew point, wet bulb temperature - Get enthalpy and humidity ratio values - All calculations use standard ASHRAE formulas 5. Unit Converter - Temperature: F, C, K - Pressure: PSI, kPa, bar, inHg, atm - Length: ft, m, in, cm - Power: BTU/hr, kW, HP, tons, Watts - Flow: CFM, L/s, m3/hr, GPM - Energy: BTU, kWh, MJ, therms WORKS COMPLETELY OFFLINE No internet connection required. All calculations are performed locally on your device. No data is collected or transmitted. BUILT FOR PROFESSIONALS - Clean, easy-to-read interface designed for field use - Large input buttons for use with gloves - Instant results with professional accuracy - Based on standard HVAC engineering formulas HVAC Load Duct Calc is a one-time purchase with no subscriptions, no ads, and no in-app purchases. Pay once, use forever.