# HVAC Sensible Heat & CFM Calculator

> HVAC Sensible Heat & CFM 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 sensible heat load in BTU/h (using 1.08 × CFM × ΔT) or the required CFM airflow for a given heat load and temperature difference

## Facts

- Endpoint: GET https://hvac-calc.x402tookit.com/sensible-heat?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hvac-sensible-heat-cfm-calculator-d46f9dac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M0vShO0N-ab5QmjG-NoKG

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability hvac-sensible-heat-cfm-calculator-d46f9dac
```

Example prompt: What's the sensible heat load if I'm supplying 1200 CFM of air with a 20°F temperature difference from the room? And can you also convert the result to tons and kilowatts?

## When to prefer this

Use this endpoint when you need a quick, reliable calculation of HVAC sensible heat load using the standard 1.08 × CFM × ΔT formula, or to back-calculate the required airflow from a known load. Prefer this over general-purpose calculators when you need structured output including tons and kilowatts conversions alongside the BTU/h result. It is especially useful in automated HVAC design workflows, equipment selection pipelines, or energy audit tools where per-call cost is acceptable for accurate, formula-based answers.

## Known failure modes

- Missing required deltaTF parameter returns a validation error
- Providing neither cfm nor loadBtuh (only deltaTF) results in an incomplete or error response
- Zero or negative deltaTF values may be rejected per schema constraint (above 0 required)
- Network or payment failure returns a 402 or 5xx error
- Conflicting inputs (both cfm and loadBtuh provided) may produce unexpected behavior

## How this service works

Sensible heat from airflow and temperature difference (1.08 x CFM x dT), or the CFM needed for a heat load.

## Output

Returns the calculated sensible heat in BTU/h (or the required CFM if loadBtuh was provided), along with converted values in tons and kilowatts, the echoed delta T and CFM, a plain-language summary and verdict, and optional disclaimer or degraded-mode flags.

## Request schema (JSON Schema)

```json
{
 "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": [
      "deltaTF"
     ],
     "properties": {
      "cfm": {
       "type": "number",
       "description": "Airflow in CFM; send this or loadBtuh"
      },
      "deltaTF": {
       "type": "number",
       "description": "Air temperature difference in degrees F (supply versus room), above 0"
      },
      "loadBtuh": {
       "type": "number",
       "description": "Sensible load in BTU/h to get the CFM needed instead"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "cfm": {
       "type": [
        "null",
        "number"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "tons": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "deltaTF": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "kilowatts": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "sensibleBtuh": {
       "type": [
        "null",
        "number"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hvac-sensible-heat-cfm-calculator-d46f9dac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hvac-calc.x402tookit.com](https://www.zero.xyz/host/hvac-calc.x402tookit.com/llms.txt)