HVAC Superheat Subcooling Calc

On a service call and need to check superheat and subcooling without flipping through PT charts? Select your refrigerant (R-410A, R-22, R-134a, or R-404A), enter suction and liquid line pressures and temperatures, and get instant color-coded readings: green for normal, yellow for marginal, red for out of range. WHAT IT CALCULATES: - Superheat (suction line temperature minus saturation temperature) - Subcooling (saturation temperature minus liquid line temperature) - Saturation temperatures from built-in pressure-temperature charts REFRIGERANTS SUPPORTED: - R-410A - R-22 - R-134a - R-404A KEY FEATURES: - Built-in PT charts for all four refrigerants - Color-coded status indicators for quick diagnosis - Target range reference (10-15 F for both superheat and subcooling) - Instant results as you adjust inputs - Works completely offline - No account or login required Built for HVAC technicians, refrigeration mechanics, and service professionals who need fast, reliable superheat and subcooling checks during system diagnostics and charging.