Free HVAC Tools & Pressure Charts
Fast, reliable field reference tools designed for the service van and rooftop. Check refrigerant saturation pressures, calculate actual superheat and subcooling, and keep commercial maintenance on track.
Refrigerant Pressure-Temperature (PT) Charts
R-454B PT Chart
R-32 / R-1234yf (68.9% / 31.1% by mass). Temperatures from -40 °F to 150 °F (-40 °C to 65 °C) with psig and kPa(g) toggles.
Includes dual bubble (liquid) & dew (vapour) saturation columns.
R-32 PT Chart
Pure difluoromethane (CH2F2, 100%). Temperatures from -40 °F to 150 °F (-40 °C to 65 °C) with psig and kPa(g) toggles.
R-410A PT Chart
R-32 / R-125 (50% / 50% by mass). Temperatures from -40 °F to 150 °F (-40 °C to 65 °C) with psig and kPa(g) toggles.
R-404A PT Chart
R-125 / R-143a / R-134a (44% / 52% / 4% by mass). Temperatures from -40 °F to 150 °F (-40 °C to 65 °C) with psig and kPa(g) toggles.
Includes dual bubble (liquid) & dew (vapour) saturation columns.
R-448A PT Chart
R-32 / R-125 / R-1234yf / R-134a / R-1234ze (26% / 26% / 20% / 21% / 7% by mass). Temperatures from -40 °F to 150 °F (-40 °C to 65 °C) with psig and kPa(g) toggles.
Includes dual bubble (liquid) & dew (vapour) saturation columns.
R-507A PT Chart
R-125 / R-143a (50% / 50% by mass). Temperatures from -40 °F to 150 °F (-40 °C to 65 °C) with psig and kPa(g) toggles.
Field Calculators & Maintenance Guides
Superheat & Subcooling Calculator
Enter suction pressure & line temp for actual superheat (dew saturation), and liquid line pressure & temp for actual subcooling (bubble saturation). Supports R-454B, R-32, and R-410A in °F and °C.
Refrigerant Leak Rate Calculator
Calculate annualized leak rates using the US EPA annualizing method (40 CFR 82.152). Supports lb, kg, and oz with step-by-step breakdown and regulatory threshold references.
Commercial RTU Maintenance Checklist
Comprehensive seasonal maintenance checklist for commercial rooftop units: filters, belts, electrical connections, gas heating heat exchanger inspection, and refrigeration system checks.
Nameplate Decoder
Snap a data plate and get make, model, serial, refrigerant and charge, electrical and BTU, plus the build date from the serial for supported brands.
Serial Number Age Decoder
Decode manufacture date and equipment age from HVAC and refrigeration serial numbers. Supports Carrier, Lennox, Goodman, Rheem, York, Scotsman, Copeland, and Daikin.
Equipment QR Tags
Print a QR tag for every unit you service. Your crew scans a unit and sees every visit. Anyone else who scans it sees your shop's name and a button to call you. Already tag your units? Link your own stickers to each unit by scanning their QR or typing the code, or print ours.