# HVAC Efficiency Unit Converter

> HVAC Efficiency Unit Converter is a paid API for AI agents from hvac-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Converts between HVAC efficiency ratings (EER, COP, kW/ton) and cooling capacity units (tons, BTU/h, kW).

## Facts

- Endpoint: GET https://hvac-calc.x402tookit.com/efficiency-convert?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hvac-efficiency-unit-converter-5ad5c52f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_o3E2-hKvmTLNul7fEmhxH

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-efficiency-unit-converter-5ad5c52f
```

Example prompt: Can you convert a COP of 3.8 to EER and kW per ton? The cooling capacity is 5 tons — what's that in BTU/h and kW as well?

## When to prefer this

Use this endpoint when you need to interconvert HVAC efficiency ratings (EER, COP, kW/ton) or cooling capacity units (tons, BTU/h, kW) in a single call. Ideal for engineering tools, energy audits, equipment comparisons, and building system specifications where multiple unit systems are in use. Prefer this over manual formulas when you need a validated, structured response with a summary and disclaimer.

## Known failure modes

- Missing required input: neither an efficiency metric nor a capacity value provided — returns error or nulls
- Ambiguous input: sending more than one efficiency metric (e.g. both EER and COP) may cause conflict
- Invalid numeric values (negative or zero) may produce nonsensical results
- Capacity-only input without efficiency metric yields capacity conversions but null efficiency fields
- Network or payment failure returns HTTP 402 or 5xx with no conversion data

## How this service works

Convert EER, COP and kW per ton, and tons, BTU/h and kW of cooling capacity.

## Output

Returns all three efficiency metrics (EER, COP, kW/ton) and all three capacity units (tons, BTU/h, kW thermal) derived from the inputs provided, along with electrical kW, a human-readable summary, a verdict, and a disclaimer. Null values appear for fields that cannot be derived without additional input.

## 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": [],
     "properties": {
      "kw": {
       "type": "number",
       "description": "Capacity in kW (thermal)"
      },
      "cop": {
       "type": "number",
       "description": "Coefficient of performance"
      },
      "eer": {
       "type": "number",
       "description": "Energy efficiency ratio (BTU/h per watt); send exactly one of eer, cop or kwPerTon"
      },
      "btuh": {
       "type": "number",
       "description": "Capacity in BTU/h"
      },
      "tons": {
       "type": "number",
       "description": "Capacity in tons; optional, send exactly one of tons, btuh or kw for capacity"
      },
      "kwPerTon": {
       "type": "number",
       "description": "Electrical kW per ton of cooling"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "kw": {
       "type": [
        "null",
        "number"
       ]
      },
      "cop": {
       "type": [
        "null",
        "number"
       ]
      },
      "eer": {
       "type": [
        "null",
        "number"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "btuh": {
       "type": [
        "null",
        "number"
       ]
      },
      "tons": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "kwPerTon": {
       "type": [
        "null",
        "number"
       ]
      },
      "di
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hvac-efficiency-unit-converter-5ad5c52f/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)