HVAC Reference Tools

Free online calculators and lookup tools for HVAC service technicians

Pressure-Temperature (PT) Chart

Select a refrigerant to view saturated pressure vs temperature

Refrigerant

Temperature (F)

Refrigerant Charge Lookup

Estimate refrigerant charge based on chiller capacity and type

Refrigerant Type

Capacity (tons)

Chiller Type

Chilled Water Pipe Sizing

Calculate recommended pipe size based on flow rate

Flow Rate (GPM)

Max Velocity (ft/s)

Superheat / Subcooling Calculator

Calculate target superheat or subcooling for TXV/EEV systems

Refrigerant

Calculation

Measured Temp (F)

Saturation Temp (F)

Compressor Model Search

Search compressor specifications by model prefix

Compressor Model

Disclaimer: All calculation results are for reference only. Always verify with OEM specifications and applicable codes (ASHRAE, NFPA). Consult a licensed professional engineer for critical applications.