{
 "id": "bus_cost_ashp_quartiles",
 "name": "Air source heat pump installed cost, middle half, Boiler Upgrade Scheme installs",
 "category": "heat_pump_cost",
 "value_num": [
  11128,
  15627
 ],
 "display": "£11,128 to £15,627",
 "unit": "lower quartile to upper quartile of reported air source (air-to-water) heat pump installation costs with a Boiler Upgrade Scheme grant paid, England and Wales, VAT included, grant not taken off",
 "period_start": "2026-04-01",
 "period_end": "2026-06-30",
 "period_kind": "data",
 "deadline": null,
 "source_url": "https://www.gov.uk/government/statistics/boiler-upgrade-scheme-statistics-august-2026",
 "source_org": "DESNZ, Boiler Upgrade Scheme statistics August 2026, Table Q1.1A",
 "checked_at": "2026-10-02",
 "recheck_by": "2026-11-05",
 "history": [],
 "public_note": "The middle half of those installs. A quarter cost less than the lower figure and a quarter cost more than the upper one, so a quote outside this range is not wrong, just unusual, and worth asking about.",
 "next": null,
 "url": "https://hearthsum.co.uk/api/bus_cost_ashp_quartiles.json"
}