HVAC technician cannot distinguish between a restricted TXV and low refrigerant charge, leading to diagnostic uncertainty and trial-and-error troubleshooting.

No clear diagnostic method using only basic pressure/temperature readings to differentiate TXV restriction from low charge; technicians resort to adding refrigerant as a test, which is time-consuming and may mislead.

Severity

3Medium

Willingness to Pay

implied

Added

May 12, 2026

Workarounds Described

Add a little gas and see what happens

Implied Software Gaps

Diagnostic app that uses system parameters to distinguish TXV restriction from low charge without trial-and-error refrigerant addition

App Concept

ChargeCheck Pro

ChargeCheck Pro uses real-time system data (pressures, temperatures, superheat, subcooling) and a diagnostic algorithm to instantly distinguish between TXV restriction and low charge. The mobile app guides the technician through a quick test procedure and displays a confident diagnosis with confidence level, eliminating guesswork and service call repeat visits.

Key Features

Guided diagnostic workflow with step-by-step instructions
Real-time data input from connected gauges or manual entry
Algorithm-based differentiation of TXV restriction vs low charge using subcool, superheat, and pressures
Confidence score with explanation of diagnostic reasoning

Target Users: HVAC technicians and service companies in residential and commercial refrigeration & AC service, especially those diagnosing tricky TXV systems.

Revenue Model: $9.99 per diagnostic check or $29.99/month subscription for unlimited diagnostics and data logging

Existing Solutions Mentioned

TXVgaugesadd refrigerant as test

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