{
  "provider": {
    "name": "CalculateEnergySavings.com",
    "source_url": "https://calculateenergysavings.com/",
    "terms_url": "https://calculateenergysavings.com/api-terms/",
    "terms_version": "2026-08-25"
  },
  "id": "window-replacement",
  "name": "Window Replacement Energy Savings Calculator",
  "description": "Estimate heating and cooling savings from window replacement using area, U-factor, climate, system efficiency, utility prices, and project cost.",
  "status": "published",
  "callable": true,
  "version": "1.0.0",
  "url": "https://calculateenergysavings.com/calculators/window-replacement/",
  "methodology_url": "https://calculateenergysavings.com/calculators/window-replacement/#methodology",
  "api_url": "https://calculateenergysavings.com/api/v1/calculators/window-replacement",
  "calculate_url": "https://calculateenergysavings.com/api/v1/calculators/window-replacement/calculate",
  "input_schema": {
    "type": "object",
    "additionalProperties": false,
    "properties": {
      "windowArea": {
        "type": "number",
        "default": 300
      },
      "existingUFactor": {
        "type": "number",
        "default": 0.55
      },
      "proposedUFactor": {
        "type": "number",
        "default": 0.28
      },
      "heatingDegreeDays": {
        "type": "number",
        "default": 6000
      },
      "coolingDegreeDays": {
        "type": "number",
        "default": 900
      },
      "heatingEfficiencyPercent": {
        "type": "number",
        "default": 85
      },
      "heatingCostPerMmbtu": {
        "type": "number",
        "default": 15
      },
      "coolingCop": {
        "type": "number",
        "default": 3
      },
      "electricityRate": {
        "type": "number",
        "default": 0.12
      },
      "annualMaintenanceSavings": {
        "type": "number",
        "default": 0
      },
      "installedCost": {
        "type": "number"
      },
      "incentiveAmount": {
        "type": "number",
        "default": 0
      },
      "projectLife": {
        "type": "number",
        "default": 25
      },
      "discountRatePercent": {
        "type": "number",
        "default": 7
      },
      "energyEscalationPercent": {
        "type": "number",
        "default": 2.5
      }
    }
  },
  "example_inputs": {
    "windowArea": 300,
    "existingUFactor": 0.55,
    "proposedUFactor": 0.28,
    "heatingDegreeDays": 6000,
    "coolingDegreeDays": 900,
    "heatingEfficiencyPercent": 85,
    "heatingCostPerMmbtu": 15,
    "coolingCop": 3,
    "electricityRate": 0.12,
    "annualMaintenanceSavings": 0,
    "installedCost": "",
    "incentiveAmount": 0,
    "projectLife": 25,
    "discountRatePercent": 7,
    "energyEscalationPercent": 2.5
  },
  "source_url": null,
  "formulas": [],
  "disclaimer": "Screening estimate only. Verify measurements, assumptions, tariffs, equipment constraints, and applicable requirements before making a project or purchasing decision."
}