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HVAC Mixed-Air Temperature & Outside-Air Fraction Calculator
x402
HVAC Mixed-Air Temperature & Outside-Air Fraction Calculator is a paid API for AI agents from hvac-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates the mixed-air dry-bulb temperature and outside-air fraction when two airstreams (e.g. return air and outside air) are blended together.
Price / call$0.02
Success—
StatusUnknown
How this service works
Mixed-air temperature of two airstreams (return plus outside air) and the outside-air fraction.
Output
Returns the mixed dry-bulb temperature of the combined airstream, the total CFM, and the percentage fraction contributed by stream B (typically outside air), along with a summary, source, and optional degraded/disclaimer fields.
Example use cases
Economizer outside-air fraction check
“We're running 4500 CFM of return air at 72°F and bringing in 1500 CFM of outside air at 55°F through the economizer — what's the resulting mixed-air temperature and what fraction of the supply is outside air?”
AHU design point verification
“For our air handling unit design, if we mix 8000 CFM of return air at 76°F with 2000 CFM of fresh outside air at 98°F, what mixed-air temperature should I use for coil sizing?”
Demand-controlled ventilation adjustment
“We just increased outside air to 600 CFM at 28°F while return air is 2400 CFM at 70°F — can you tell me what the mixed-air temperature will be so I can check if we're risking freezing the coil?”
Technical details
Endpoint
GEThttps://hvac-calc.x402tookit.com/mixed-air?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, precise mixed-air temperature calculation for HVAC design, commissioning, or control logic — particularly for air handling unit economizer analysis, coil sizing, or outside-air fraction verification. It is purpose-built for HVAC psychrometric mixing (not full load calculations or humidity/enthalpy mixing).
Side effects
- Missing required query parameters (cfmA, cfmB, tempA, tempB) returns a 4xx error
- Negative or zero CFM values may produce nonsensical results or errors
- Mismatched temperature units between streams A and B will yield incorrect results since the API does not convert units
- Payment failure via x402 protocol returns 402 status before computation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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