HVAC Load Duct Calc

BTU, Psychrometric, Ref Tool

$3.99 · Designed for iPad. Not verified for macOS.

Professional HVAC tools for technicians. BTU load, duct sizing, psychrometric, refrigerant data, and unit conversion in one app. 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.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, 剑挥 吴, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    剑挥 吴
    Size
    23.4 MB
    Category
    Reference
    Compatibility
    Requires iOS 15.1 or later.
    • iPhone
      Requires iOS 15.1 or later.
    • iPad
      Requires iPadOS 15.1 or later.
    • iPod touch
      Requires iOS 15.1 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Jianhui Wu
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

    More by 剑挥 吴