{
  "id": "v20-ie-furnace-replacement",
  "version": "20.16.0",
  "name": "Furnace Replacement Calculator — Ireland",
  "shortName": "Furnace Replacement",
  "description": "Compare the fuel-cost consequence of two seasonal efficiencies at the same useful heating load. EUR planning view; stated limitations apply.",
  "category": "Home & Construction",
  "categorySlug": "home-construction",
  "keywords": [
    "furnace-replacement",
    "ie",
    "energy-conservation",
    "pvwatts",
    "energy-saver"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/v20-ie-furnace-replacement.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."
  },
  "notice": "Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.",
  "urls": {
    "page": "/ie/furnace-replacement/",
    "definition": "/ie/furnace-replacement/definition.json",
    "schema": "/ie/furnace-replacement/schema.json",
    "llms": "/ie/furnace-replacement/llms.txt",
    "legacyDefinition": "/ie/furnace-replacement/definition.json"
  },
  "queryExample": "https://askcalculators.com/ie/furnace-replacement/?annualFuelCost=1800&oldEfficiency=75&newEfficiency=95&projectCost=7000&incentive=0&maintenanceChange=0&years=15&discountRate=4",
  "queryParameters": {
    "annualFuelCost": {
      "label": "Current annual fuel-only cost",
      "type": "money",
      "required": true,
      "default": 1800
    },
    "oldEfficiency": {
      "label": "Current seasonal efficiency",
      "type": "percent",
      "required": true,
      "default": 75
    },
    "newEfficiency": {
      "label": "Replacement seasonal efficiency",
      "type": "percent",
      "required": true,
      "default": 95
    },
    "projectCost": {
      "label": "Installed replacement price",
      "type": "money",
      "required": true,
      "default": 7000
    },
    "incentive": {
      "label": "Confirmed incentive",
      "type": "money",
      "required": true,
      "default": 0
    },
    "maintenanceChange": {
      "label": "Additional annual maintenance",
      "type": "money",
      "required": true,
      "default": 0
    },
    "years": {
      "label": "Planning horizon, years",
      "type": "number",
      "required": true,
      "default": 15
    },
    "discountRate": {
      "label": "Discount rate",
      "type": "percent",
      "required": true,
      "default": 4
    }
  },
  "inputs": [
    {
      "id": "annualFuelCost",
      "label": "Current annual fuel-only cost",
      "type": "money",
      "defaultValue": 1800,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "EUR",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "oldEfficiency",
      "label": "Current seasonal efficiency",
      "type": "percent",
      "defaultValue": 75,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "newEfficiency",
      "label": "Replacement seasonal efficiency",
      "type": "percent",
      "defaultValue": 95,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "projectCost",
      "label": "Installed replacement price",
      "type": "money",
      "defaultValue": 7000,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "EUR",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "incentive",
      "label": "Confirmed incentive",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "EUR",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "maintenanceChange",
      "label": "Additional annual maintenance",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "EUR",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "years",
      "label": "Planning horizon, years",
      "type": "number",
      "defaultValue": 15,
      "required": true,
      "min": 1,
      "max": 40,
      "step": 1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "discountRate",
      "label": "Discount rate",
      "type": "percent",
      "defaultValue": 4,
      "required": true,
      "min": 0,
      "max": 50,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    }
  ],
  "outputs": [
    {
      "id": "capital",
      "label": "Net capital cost",
      "format": "currency",
      "digits": 2,
      "currency": "EUR"
    },
    {
      "id": "annualSaving",
      "label": "First-year net saving",
      "format": "currency",
      "digits": 2,
      "currency": "EUR"
    },
    {
      "id": "payback",
      "label": "Simple payback, years",
      "format": "number",
      "digits": 2,
      "primary": true
    },
    {
      "id": "npv",
      "label": "Discounted net value",
      "format": "currency",
      "digits": 2,
      "currency": "EUR"
    }
  ],
  "formula": {
    "expression": "gross fuel saving = current fuel spending × (1 − old efficiency ÷ new efficiency).",
    "note": "Inputs are converted to canonical units before evaluating this stated formula."
  },
  "examples": [
    {
      "label": "Illustrative defaults; required verification checks remain unconfirmed",
      "inputs": {
        "unitSystem": "metric",
        "annualFuelCost": 1800,
        "oldEfficiency": 75,
        "newEfficiency": 95,
        "projectCost": 7000,
        "incentive": 0,
        "maintenanceChange": 0,
        "years": 15,
        "discountRate": 4
      }
    }
  ],
  "sources": [
    {
      "label": "DOE energy-use arithmetic",
      "url": "https://www.energy.gov/energysaver/save-electricity-and-fuel/appliances-and-electronics/estimating-appliance-and-home"
    },
    {
      "label": "PVWatts: site-specific solar estimation",
      "url": "https://pvwatts.nlr.gov/"
    },
    {
      "label": "DOE insulation overview",
      "url": "https://www.energy.gov/energysaver/weatherize/insulation"
    }
  ],
  "publicSlug": "furnace-replacement",
  "namespace": "ie",
  "countries": [
    "us",
    "ca",
    "uk",
    "ie"
  ]
}