{"uid":"cap_NkXBdAD9giFiG195es3_x","slug":"hvac-mixed-air-temperature-outside-air-fraction-calculator-9f890357","name":"HVAC Mixed-Air Temperature & Outside-Air Fraction Calculator","description":"Mixed-air temperature of two airstreams (return plus outside air) and the outside-air fraction.","url":"https://hvac-calc.x402tookit.com/mixed-air?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["cfmA","tempA","cfmB","tempB"],"properties":{"cfmA":{"type":"number","description":"Airflow of stream A in CFM (for example return air)"},"cfmB":{"type":"number","description":"Airflow of stream B in CFM (for example outside air)"},"tempA":{"type":"number","description":"Dry-bulb temperature of stream A (any unit, same as tempB)"},"tempB":{"type":"number","description":"Dry-bulb temperature of stream B"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"totalCfm":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"mixedTemperature":{"type":["null","number"]},"streamBFractionPercent":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_O3kBfeTC7BNERRuXlEZNQ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates the mixed-air dry-bulb temperature and outside-air fraction when two airstreams (e.g. return air and outside air) are blended together.","exampleAgentPrompt":"I have a return air stream of 3000 CFM at 75°F mixing with 1000 CFM of outside air at 95°F — what will the mixed-air temperature be, and what percentage is outside air?","exampleUseCases":[{"title":"Economizer outside-air fraction check","prompt":"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?"},{"title":"AHU design point verification","prompt":"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?"},{"title":"Demand-controlled ventilation adjustment","prompt":"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?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:12:41.049Z","isFirstParty":false,"canonicalSlug":"hvac-mixed-air-temperature-outside-air-fraction-calculator-9f890357"}