Superheat & Subcool Calc
10 Refrigerants Diagnostics
About
This tool calculates superheat, subcooling, and saturation for 10 refrigerants, aiding HVAC technicians in system diagnostics and commissioning. It offers smart charge recommendations and color-coded results for quick field decisions, functioning entirely offline.
What's New in Superheat & Subcool Calc
1.0.8
June 11, 2026
What's new: - Recalculated all refrigerant P-T saturation tables to NIST REFPROP-grade accuracy, verified against manufacturer charts - Extended pressure range to -60...+150 F saturation for hot condenser readings - Corrected temperature glide values for R-454B, R-407C and R-404A
MoreIn-App Purchases
$2.99
Pro Unlock
No ads, unlimited history, PDF export, dark theme.
Charts
Developer apps
FAQ
What is Superheat & Subcool Calc used for?
Superheat & Subcool Calc is a professional field diagnostic tool for HVAC service and system commissioning. It calculates superheat, subcooling, and saturation for various refrigerants, providing smart charge diagnostics and color-coded results for instant field decisions.
How does Superheat & Subcool Calc work?
Users select the refrigerant and metering device, then enter suction and liquid pressures and temperatures. The app then provides instant superheat, subcooling, and charge diagnosis results.
Does Superheat & Subcool Calc support new refrigerants like R-454B?
Yes, Superheat & Subcool Calc supports 10 refrigerants, including R-410A, R-454B (EPA 608 transition), and R-32, along with legacy and other common refrigerants.
Can I use Superheat & Subcool Calc without an internet connection?
Yes, the app is 100% offline. All refrigerant data is built-in, allowing it to work on job sites without cellular coverage.
What are the normal ranges for superheat and subcooling?
Normal superheat is typically 10-20°F for TXV and 15-25°F for fixed orifice. Normal subcooling is generally 10-20°F. The app provides context for low or high readings.
What is the price of Superheat & Subcool Calc?
Superheat & Subcool Calc is available for a one-time purchase of $0.99.
Does Superheat & Subcool Calc have ads?
The base version of Superheat & Subcool Calc does not contain advertisements. An optional pro upgrade offers an ad-free experience along with other features.
What features are included in the optional Pro Upgrade?
The optional Pro Upgrade, available for a one-time in-app purchase of $2.99, includes unlimited saved calculation history, PDF export of results, a dark theme, and an ad-free experience.