RefrigCharge

Subcool · Superheat · TXV

$4.99 · Designed for iPad. Not verified for macOS.

R-410A subcool 7°F vs target 10°F - undercharged or low airflow? Diagnoses subcool, superheat, and charge advice for 5 refrigerants. $4.99 one-time, no login. Built for HVAC service techs and install crews who need subcool / superheat diagnosis on the roof - not a dashboard you log into. WHAT IT DOES Computes measured subcooling and superheat from your gauge readings, compares them against per-refrigerant target windows, and tells you whether the system is undercharged, overcharged, or showing airflow issues. Charge adjustment advice differs for TXV vs. piston / cap-tube metering, matching the field workflow. REFRIGERANTS SUPPORTED - R-410A - R-22 - R-134a - R-404A - R-407C INPUTS - Refrigerant type (picker) - Metering device (TXV or Piston / Cap Tube) - Liquid line temperature - Condensing saturation temperature - Suction line temperature - Evaporating saturation temperature - °F or °C toggle RETURNS - Measured subcooling vs. target (color-coded: green within ±3°F, red outside) - Measured superheat vs. target (color-coded) - Diagnosis: undercharged, overcharged, normal, or airflow issue - Charge adjustment advice: ADD, REMOVE, or CORRECT - Adjustment basis: subcool for TXV, superheat for piston WHY THIS APP, NOT THE FREE ONES - Math is shown - measured minus target, with the per-refrigerant windows visible. - Status at a glance - color-coded so you do not have to do mental arithmetic on the ladder. - Works offline - RF-shielded basements, attics, and roofs. Always available. - No login. No ads. No telemetry. No subscription. PRICING $4.99. Pay once, own it. Lifetime access on iPhone, iPad, and Mac via Family Sharing. NOT A SUBSTITUTE FOR The manufacturer's charging procedure for your specific equipment. The equipment data plate's nameplate charge. Calibrated gauge sets. This app gives you a directional read - verify against the OEM service manual before adjusting.

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Listing refresh - clarified the description, inputs/outputs, and which standards are referenced. No functional changes.

Version 1.0.1

The developer, Shanghai Sheyuan Network Technology Co., Ltd., 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.

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    Information

    Seller
    • Shanghai Sheyuan Network Technology Co., Ltd.
    Size
    • 998.4 KB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 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 Sheyuan Inc.
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

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

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