{
  "provider": {
    "name": "CalculateEnergySavings.com",
    "source_url": "https://calculateenergysavings.com/",
    "terms_url": "https://calculateenergysavings.com/api-terms/",
    "terms_version": "2026-08-25"
  },
  "id": "heat-pump-comparison",
  "name": "Heat Pump vs. Existing Heating Calculator",
  "description": "Compare heat-pump energy use and annual operating cost with an existing heating system using editable climate, efficiency, fuel, and electricity assumptions.",
  "status": "published",
  "callable": true,
  "version": "1.0.0",
  "url": "https://calculateenergysavings.com/calculators/heat-pump-comparison/",
  "methodology_url": "https://calculateenergysavings.com/calculators/heat-pump-comparison/#methodology",
  "api_url": "https://calculateenergysavings.com/api/v1/calculators/heat-pump-comparison",
  "calculate_url": "https://calculateenergysavings.com/api/v1/calculators/heat-pump-comparison/calculate",
  "input_schema": {
    "type": "object",
    "additionalProperties": false,
    "properties": {
      "annualHeatingLoadMmbtu": {
        "type": "number",
        "default": 60
      },
      "existingFuelType": {
        "type": "string",
        "default": "natural-gas"
      },
      "existingEfficiencyPercent": {
        "type": "number",
        "default": 80
      },
      "existingFuelPrice": {
        "type": "number",
        "default": 1.5
      },
      "heatPumpCop": {
        "type": "number",
        "default": 2.8
      },
      "backupHeatFractionPercent": {
        "type": "number",
        "default": 15
      },
      "backupHeatCop": {
        "type": "number",
        "default": 1
      },
      "electricityRate": {
        "type": "number",
        "default": 0.12
      },
      "annualMaintenanceSavings": {
        "type": "number",
        "default": 150
      },
      "installedCost": {
        "type": "number"
      },
      "incentiveAmount": {
        "type": "number",
        "default": 0
      },
      "projectLife": {
        "type": "number",
        "default": 15
      },
      "discountRatePercent": {
        "type": "number",
        "default": 7
      },
      "energyEscalationPercent": {
        "type": "number",
        "default": 2.5
      }
    }
  },
  "example_inputs": {
    "annualHeatingLoadMmbtu": 60,
    "existingFuelType": "natural-gas",
    "existingEfficiencyPercent": 80,
    "existingFuelPrice": 1.5,
    "heatPumpCop": 2.8,
    "backupHeatFractionPercent": 15,
    "backupHeatCop": 1,
    "electricityRate": 0.12,
    "annualMaintenanceSavings": 150,
    "installedCost": "",
    "incentiveAmount": 0,
    "projectLife": 15,
    "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."
}