Answers "What is the dew point / enthalpy / humidity ratio of 95 °F air at 75 °F wet bulb?" and "What RH is 75 °F air with a 55 °F dew point in Denver?" for HVAC design, commissioning, energy and comfort work. From any two of dry bulb, wet bulb, dew point, relative humidity, humidity ratio, enthalpy or grains, returns the full state point: all seven plus specific volume, density and vapor pressure, at any site elevation (atmospheric pressure), in IP (°F, BTU/lb, gr/lb) or SI (°C, kJ/kg, g/kg). Uses the ASHRAE Handbook—Fundamentals (2021) Ch. 1 equations (Hyland-Wexler saturation pressure, ice below freezing) and is cross-checked against PsychroLib to within 0.02 °F. Every result includes `steps`: each equation with the numbers put into it and its ASHRAE reference, so the work can be checked or pasted into a calc package. Impossible states (wet bulb above dry bulb, RH over 100%) are errors and are not charged. You are only charged when a result is returned: invalid input (400) and upstream failures (4xx/5xx) are not settled. Costs $0.002 USDC per call via x402. Paid per call with x402 inside MCP (see the server instructions).
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