Psychrometric calculator for HVAC engineering
Psychrometric calculator for HVAC engineering: from any two of dry bulb, wet bulb, dew point, RH, humidity ratio, enthalpy or grains, the full moist-air state (plus specific volume, density, vapor pressure) at any elevation, IP or SI. ASHRAE Fundamentals 2021 equations, cross-checked against PsychroLib. Shows every step with the numbers and ASHRAE references. $0.002 USDC per call.
Answeringour last check, 2026-10-10
1 of 1checks answered this week
177 msmedian answer time
$0.002listed price per call
$0.002price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402-agent-api.onrender.com/api/v1/hvac-psychrometrics
| Category | Everything else |
|---|---|
| Provider host | x402-agent-api.onrender.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.002 | 177 ms |
Example input (from the provider)
{
"body": {
"dry_bulb": 95,
"elevation": 0,
"wet_bulb": 75
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"dew_point": {
"description": "Dew-point temperature, \u00b0F or \u00b0C.",
"type": "number"
},
"dry_bulb": {
"description": "Dry-bulb temperature, \u00b0F (IP) or \u00b0C (SI).",
"type": "number"
},
"elevation": {
"default": 0,
"description": "Site elevation, ft (IP) or m (SI); sets the atmospheric pressure. Default 0 (sea level).",
"maximum": 30000,
"minimum": -1500,
"type": "number"
},
"enthalpy": {
"description": "Enthalpy: BTU per lb dry air (IP) or kJ/kg dry air (SI).",
"type": "number"
},
"grains": {
"description": "Moisture in grains per lb dry air (gr/lb), in either unit system (7,000 gr = 1 lb).",
"minimum": 0,
"type": "number"
},
"humidity_ratio": {
"description": "Humidity ratio: lb water per lb dry air (IP, e.g. 0.0100) or g/kg (SI, e.g. 10.0).",
"minimum": 0,
"type": "number"
},
"relative_humidity": {
"description": "Relative humidity, % (0-100).",
"maximum": 100,
"minimum": 0,
"type": "number"
},
"units": {
"default": "IP",
"description": "\"IP\" (\u00b0F, CFM, in, BTU) or \"SI\" (\u00b0C, L/s, mm, kW). Default IP. Applies to inputs and results.",
"enum": [
"IP",
"SI"
],
"type": "string"
},
"wet_bulb": {
"description": "Wet-bulb temperature, \u00b0F or \u00b0C.",
"type": "number"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}