HVAC Charge ProHow to calculate superheat
The formula, where to measure, which saturation temperature to use, and a worked R-410A example.
MUEN Apps / Field guides
HVAC field guides.
Practical, calculation-focused references for technicians who charge and diagnose systems. Each guide uses the same math as the app, with worked examples.
How to calculate subcooling
The formula, which saturation temperature to use, and a worked R-410A example.
Reading a refrigerant P-T chart: bubble point, dew point and glide
Gauge pressure, bubble versus dew, glide on blends, and a short R-410A and R-454B excerpt.
What to record on a charge check, and why it pays off later
The readings and context worth keeping, and how saved jobs and PDF reports fit in.
The charging workflow
From stable system to saved record.
- Stabilize. Confirm airflow and let pressures and temperatures settle.
- Measure. Read gauge pressure and clamp the line temperature on the correct line.
- Calculate. Convert pressure to the right saturation temperature (dew for superheat, bubble for subcooling) and subtract.
- Compare. Check the result against the manufacturer’s target, not a rule of thumb.
- Record. Save the readings and context so the next visit starts from facts.
HVAC Charge Pro and this guide are calculation and reference aids. A superheat or subcooling value alone does not decide whether to add or remove refrigerant. Follow the equipment manufacturer’s instructions, approved service procedures and applicable safety requirements.
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