HVAC Superheat Subcool Calc

HVAC superheat & subcooling calculator. R-410A, R-22, R-454B. Diagnostics

HVAC superheat and subcooling calculator with smart charge diagnostics. Calculate superheat, subcooling, and saturation temperatures for 10 refrigerants — right in the field.

Built by HVAC techs, for HVAC techs.

FEATURES:
• Instant superheat & subcooling calculation
• 10 refrigerants: R-410A, R-22, R-454B, R-32, R-407C, R-134a, R-404A, R-507A, R-290, R-717
• Smart charge diagnostics — normal, low, or high with actionable recommendations
• Supports TXV and fixed orifice (piston) metering devices
• Color-coded results for quick field decisions
• Accurate P-T saturation data from manufacturer charts
• Zeotropic blend support with correct bubble/dew point handling

100% OFFLINE:
Works without internet connection. All refrigerant data is built into the app — no server calls, no delays.

HOW IT WORKS:
1. Select your refrigerant and metering device type (TXV or fixed orifice)
2. Enter suction pressure, suction line temperature, liquid pressure, and liquid line temperature
3. Get instant superheat, subcooling, saturation temperatures, and charge diagnosis

SUPPORTED REFRIGERANTS:
R-410A (residential AC & heat pumps), R-22 (legacy systems), R-454B (next-gen R-410A replacement), R-32 (mini-splits & VRF), R-407C (commercial AC), R-134a (auto AC & chillers), R-404A (commercial refrigeration), R-507A (low-temp refrigeration), R-290 (propane systems), R-717 (ammonia industrial)

PRO UPGRADE ($2.99 one-time):
• Save calculation history
• Export professional PDF reports
• Dark theme
• Ad-free experience

ACCURACY:
All pressure-temperature data sourced from Honeywell, Chemours, and Arkema manufacturer specifications. Zeotropic blends (R-454B, R-407C, R-404A) use correct bubble/dew point calculations accounting for temperature glide.

PERFECT FOR:
• HVAC technicians on service calls
• Refrigeration mechanics
• AC installers and contractors
• HVAC students and apprentices
• Building maintenance engineers

Reliable superheat and subcooling readings for every air conditioning and refrigeration service call.