{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://askcalculators.com/ie/heat-loss/schema.json",
  "title": "Room Heat Loss Calculator — Ireland inputs",
  "description": "Estimate steady-state room heat loss from entered fabric properties, air exchange and a local outdoor design temperature. EUR planning view; stated limitations apply.",
  "type": "object",
  "properties": {
    "unitSystem": {
      "title": "Measurement system",
      "type": "string",
      "default": "metric",
      "enum": [
        "imperial",
        "metric"
      ],
      "x-optionLabels": {
        "imperial": "Imperial (US gallons / short tons where relevant)",
        "metric": "Metric"
      }
    },
    "wallArea": {
      "title": "Exposed opaque wall area",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 50,
      "minimum": 0,
      "maximum": 1000000000000,
      "x-suffix": "m²"
    },
    "wallU": {
      "title": "Wall U-value",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 0.3,
      "minimum": 0.01,
      "maximum": 10,
      "x-suffix": "W/(m²·K)"
    },
    "roofArea": {
      "title": "Exposed roof area",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 40,
      "minimum": 0,
      "maximum": 1000000000000,
      "x-suffix": "m²"
    },
    "roofU": {
      "title": "Roof U-value",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 0.2,
      "minimum": 0.01,
      "maximum": 10,
      "x-suffix": "W/(m²·K)"
    },
    "windowArea": {
      "title": "Window and external door area",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 8,
      "minimum": 0,
      "maximum": 1000000000000,
      "x-suffix": "m²"
    },
    "windowU": {
      "title": "Window/door U-value",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 1.4,
      "minimum": 0.01,
      "maximum": 20,
      "x-suffix": "W/(m²·K)"
    },
    "floorArea": {
      "title": "Exposed floor area",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 40,
      "minimum": 0,
      "maximum": 1000000000000,
      "x-suffix": "m²"
    },
    "floorU": {
      "title": "Floor U-value",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 0.25,
      "minimum": 0.01,
      "maximum": 10,
      "x-suffix": "W/(m²·K)"
    },
    "volume": {
      "title": "Heated internal volume",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 100,
      "minimum": 0,
      "maximum": 1000000000000,
      "x-suffix": "m³"
    },
    "airChanges": {
      "title": "Air changes per hour",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 0.5,
      "minimum": 0,
      "maximum": 20,
      "x-step": 0.01
    },
    "insideTemp": {
      "title": "Indoor design temperature",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": 20,
      "minimum": -10,
      "maximum": 40,
      "x-suffix": "°C"
    },
    "outsideTemp": {
      "title": "Outdoor design temperature",
      "type": "number",
      "description": "Illustrative starting value; replace with your own evidence.",
      "default": -5,
      "minimum": -80,
      "maximum": 40,
      "x-suffix": "°C"
    }
  },
  "required": [
    "wallArea",
    "wallU",
    "roofArea",
    "roofU",
    "windowArea",
    "windowU",
    "floorArea",
    "floorU",
    "volume",
    "airChanges",
    "insideTemp",
    "outsideTemp"
  ],
  "additionalProperties": false,
  "x-askcalculators": {
    "version": "20.16.0",
    "calculatorUrl": "https://askcalculators.com/ie/heat-loss/",
    "queryExample": "https://askcalculators.com/ie/heat-loss/?unitSystem=metric&wallArea=50&wallU=0.3&roofArea=40&roofU=0.2&windowArea=8&windowU=1.4&floorArea=40&floorU=0.25&volume=100&airChanges=0.5&insideTemp=20&outsideTemp=-5",
    "migrationStatus": "new",
    "reviewStatus": "pending",
    "pageStatus": "live",
    "workStatus": "pending",
    "formula": {
      "expression": "heat loss, W = Σ(area × U-value × temperature difference) + 0.33 × air changes × room volume × temperature difference.",
      "note": "Inputs are converted to canonical units before evaluating this stated formula."
    },
    "quality": {
      "availability": "live",
      "technicalReviewRecord": "/reviews/v20-ie-heat-loss.json",
      "qualifiedReview": "pending",
      "qualifiedReviewer": null,
      "qualifiedReviewDate": null,
      "formulaVersion": "20.16.0",
      "referenceCoverage": "references-listed",
      "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
      "historicalMetadataDate": "",
      "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
    },
    "outputs": {
      "fabricLoss": {
        "title": "Fabric design heat loss",
        "type": "number",
        "x-format": "number",
        "x-digits": 2
      },
      "ventilationLoss": {
        "title": "Ventilation design heat loss",
        "type": "number",
        "x-format": "number",
        "x-digits": 2
      },
      "totalLoss": {
        "title": "Total screening heat loss",
        "type": "number",
        "x-format": "number",
        "x-digits": 2,
        "x-primary": true
      }
    }
  }
}